/**
 * @license
 * Copyright 2018 Google LLC. All Rights Reserved.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 * =============================================================================
 */
import * as tf from '@tensorflow/tfjs-core';
import * as seedrandom from 'seedrandom';
import { deepClone } from '../util/deep_clone';
import { deepMapAndAwaitAll, deepZip, zipToList } from '../util/deep_map';
import { GrowingRingBuffer } from '../util/growing_ring_buffer';
import { RingBuffer } from '../util/ring_buffer';
// Here we implement a simple asynchronous iterator.
// This lets us avoid using either third-party stream libraries or
// recent TypeScript language support requiring polyfills.
/**
 * Create a `LazyIterator` from an array of items.
 */
export function iteratorFromItems(items) {
    return new ArrayIterator(items);
}
/**
 * Create a `LazyIterator` of incrementing integers.
 */
export function iteratorFromIncrementing(start) {
    let i = start;
    return iteratorFromFunction(() => ({ value: i++, done: false }));
}
/**
 * Create a `LazyIterator` from a function.
 *
 * ```js
 * let i = -1;
 * const func = () =>
 *    ++i < 5 ? {value: i, done: false} : {value: null, done: true};
 * const iter = tf.data.iteratorFromFunction(func);
 * await iter.forEachAsync(e => console.log(e));
 * ```
 *
 * @param func A function that produces data on each call.
 */
export function iteratorFromFunction(func) {
    return new FunctionCallIterator(func);
}
/**
 * Create a `LazyIterator` by concatenating underlying streams, which are
 * themselves provided as a stream.
 *
 * This can also be thought of as a "stream flatten" operation.
 *
 * @param baseIterators A stream of streams to be concatenated.
 * @param baseErrorHandler An optional function that can intercept `Error`s
 *   raised during a `next()` call on the base stream.  This function can decide
 *   whether the error should be propagated, whether the error should be
 *   ignored, or whether the base stream should be terminated.
 */
export function iteratorFromConcatenated(baseIterators, baseErrorHandler) {
    return new ChainedIterator(baseIterators, baseErrorHandler);
}
/**
 * Create a `LazyIterator` by concatenating streams produced by calling a
 * stream-generating function a given number of times.
 *
 * Since a `LazyIterator` is read-once, it cannot be repeated, but this
 * function can be used to achieve a similar effect:
 *
 *   LazyIterator.ofConcatenatedFunction(() => new MyIterator(), 6);
 *
 * @param iteratorFunc: A function that produces a new stream on each call.
 * @param count: The number of times to call the function.
 * @param baseErrorHandler An optional function that can intercept `Error`s
 *   raised during a `next()` call on the base stream.  This function can decide
 *   whether the error should be propagated, whether the error should be
 *   ignored, or whether the base stream should be terminated.
 */
export function iteratorFromConcatenatedFunction(iteratorFunc, count, baseErrorHandler) {
    return iteratorFromConcatenated(iteratorFromFunction(iteratorFunc).take(count), baseErrorHandler);
}
/**
 * Create a `LazyIterator` by zipping together an array, dict, or nested
 * structure of `LazyIterator`s (and perhaps additional constants).
 *
 * The underlying streams must provide elements in a consistent order such
 * that they correspond.
 *
 * Typically, the underlying streams should have the same number of
 * elements. If they do not, the behavior is determined by the
 * `mismatchMode` argument.
 *
 * The nested structure of the `iterators` argument determines the
 * structure of elements in the resulting iterator.
 *
 * @param iterators: An array or object containing LazyIterators at the
 * leaves.
 * @param mismatchMode: Determines what to do when one underlying iterator
 * is exhausted before the others.  `ZipMismatchMode.FAIL` (the default)
 * causes an error to be thrown in this case.  `ZipMismatchMode.SHORTEST`
 * causes the zipped iterator to terminate with the furst underlying
 * streams, so elements remaining on the longer streams are ignored.
 * `ZipMismatchMode.LONGEST` causes the zipped stream to continue, filling
 * in nulls for the exhausted streams, until all streams are exhausted.
 */
export function iteratorFromZipped(iterators, mismatchMode = ZipMismatchMode.FAIL) {
    return new ZipIterator(iterators, mismatchMode);
}
/**
 * An asynchronous iterator, providing lazy access to a potentially
 * unbounded stream of elements.
 *
 * Iterator can be obtained from a dataset:
 * `const iter = await dataset.iterator();`
 */
export class LazyIterator {
    /**
     * Collect all remaining elements of a bounded stream into an array.
     * Obviously this will succeed only for small streams that fit in memory.
     * Useful for testing.
     *
     * @returns A Promise for an array of stream elements, which will resolve
     *   when the stream is exhausted.
     */
    async toArray() {
        const result = [];
        let x = await this.next();
        while (!x.done) {
            result.push(x.value);
            x = await this.next();
        }
        return result;
    }
    /**
     * Collect all elements of this dataset into an array with prefetching 100
     * elements. This is useful for testing, because the prefetch changes the
     * order in which the Promises are resolved along the processing pipeline.
     * This may help expose bugs where results are dependent on the order of
     * Promise resolution rather than on the logical order of the stream (i.e.,
     * due to hidden mutable state).
     *
     * @returns A Promise for an array of stream elements, which will resolve
     *   when the stream is exhausted.
     */
    async toArrayForTest() {
        const stream = this.prefetch(100);
        const result = [];
        let x = await stream.next();
        while (!x.done) {
            result.push(x.value);
            x = await stream.next();
        }
        return result;
    }
    /**
     * Draw items from the stream until it is exhausted.
     *
     * This can be useful when the stream has side effects but no output.  In
     * that case, calling this function guarantees that the stream will be
     * fully processed.
     */
    async resolveFully() {
        let x = await this.next();
        while (!x.done) {
            x = await this.next();
        }
    }
    /**
     * Draw items from the stream until it is exhausted, or a predicate fails.
     *
     * This can be useful when the stream has side effects but no output.  In
     * that case, calling this function guarantees that the stream will be
     * fully processed.
     */
    async resolveWhile(predicate) {
        let x = await this.next();
        let shouldContinue = predicate(x.value);
        while ((!x.done) && shouldContinue) {
            x = await this.next();
            shouldContinue = predicate(x.value);
        }
    }
    /**
     * Handles errors thrown on this stream using a provided handler function.
     *
     * @param handler A function that handles any `Error` thrown during a `next()`
     *   call and returns true if the stream should continue (dropping the failed
     *   call) or false if the stream should quietly terminate.  If the handler
     *   itself throws (or rethrows) an `Error`, that will be propagated.
     *
     * @returns A `LazyIterator` of elements passed through from upstream,
     *   possibly filtering or terminating on upstream `next()` calls that
     *   throw an `Error`.
     */
    handleErrors(handler) {
        return new ErrorHandlingLazyIterator(this, handler);
    }
    // TODO(soergel): Implement reduce() etc.
    /**
     * Filters this stream according to `predicate`.
     *
     * @param predicate A function mapping a stream element to a boolean or a
     * `Promise` for one.
     *
     * @returns A `LazyIterator` of elements for which the predicate was true.
     */
    filter(predicate) {
        return new FilterIterator(this, predicate);
    }
    /**
     * Maps this stream through a 1-to-1 transform.
     *
     * @param transform A function mapping a stream element to a transformed
     *   element.
     *
     * @returns A `LazyIterator` of transformed elements.
     */
    map(transform) {
        return new MapIterator(this, transform);
    }
    /**
     * Maps this stream through an async 1-to-1 transform.
     *
     * @param transform A function mapping a stream element to a `Promise` for a
     *   transformed stream element.
     *
     * @returns A `LazyIterator` of transformed elements.
     */
    mapAsync(transform) {
        return new AsyncMapIterator(this, transform);
    }
    /**
     * Maps this stream through a 1-to-1 transform, forcing serial execution.
     *
     * @param transform A function mapping a stream element to a transformed
     *   element.
     *
     * @returns A `LazyIterator` of transformed elements.
     */
    serialMapAsync(transform) {
        return new AsyncMapIterator(this, transform).serial();
    }
    /**
     * Maps this stream through a 1-to-many transform.
     *
     * @param transform A function mapping a stream element to an array of
     *   transformed elements.
     *
     * @returns A `DataStream` of transformed elements.
     */
    flatmap(transform) {
        return new FlatmapIterator(this, transform);
    }
    /**
     * Apply a function to every element of the stream.
     *
     * @param f A function to apply to each stream element.
     */
    async forEachAsync(f) {
        return this.map(f).resolveFully();
    }
    /**
     * Apply a function to every element of the stream, forcing serial execution.
     *
     * @param f A function to apply to each stream element.  Should return 'true'
     *   to indicate that the stream should continue, or 'false' to cause it to
     *   terminate.
     */
    async serialForEach(f) {
        return this.serialMapAsync(f).resolveWhile(x => (x === true));
    }
    /**
     * Groups elements into batches, represented as arrays of elements.
     *
     * We can think of the elements of this iterator as 'rows' (even if they are
     * nested structures).  By the same token, consecutive values for a given
     * key within the elements form a 'column'.  This matches the usual sense of
     * 'row' and 'column' when processing tabular data (e.g., parsing a CSV).
     *
     * Thus, "Row-major" means that the resulting batch is simply a collection of
     * rows: `[row1, row2, row3, ...]`.  This is contrast to the column-major
     * form, which is needed for vectorized computation.
     *
     * @param batchSize The number of elements desired per batch.
     * @param smallLastBatch Whether to emit the final batch when it has fewer
     *   than batchSize elements. Default true.
     * @returns A `LazyIterator` of batches of elements, represented as arrays
     *   of the original element type.
     */
    rowMajorBatch(batchSize, smallLastBatch = true) {
        return new RowMajorBatchIterator(this, batchSize, smallLastBatch);
    }
    /**
     * Groups elements into batches, represented in column-major form.
     *
     * We can think of the elements of this iterator as 'rows' (even if they are
     * nested structures).  By the same token, consecutive values for a given
     * key within the elements form a 'column'.  This matches the usual sense of
     * 'row' and 'column' when processing tabular data (e.g., parsing a CSV).
     *
     * Thus, "column-major" means that the resulting batch is a (potentially
     * nested) structure representing the columns.  Each column entry, then,
     * contains a collection of the values found in that column for a range of
     * input elements.  This representation allows for vectorized computation, in
     * contrast to the row-major form.
     *
     * The inputs should all have the same nested structure (i.e., of arrays and
     * dicts).  The result is a single object with the same nested structure,
     * where the leaves are arrays collecting the values of the inputs at that
     * location (or, optionally, the result of a custom function applied to those
     * arrays).
     *
     * @param batchSize The number of elements desired per batch.
     * @param smallLastBatch Whether to emit the final batch when it has fewer
     *   than batchSize elements. Default true.
     * @param zipFn: (optional) A function that expects an array of elements at a
     *   single node of the object tree, and returns a `DeepMapResult`.  The
     *   `DeepMapResult` either provides a result value for that node (i.e.,
     *   representing the subtree), or indicates that the node should be processed
     *   recursively.  The default zipFn recurses as far as possible and places
     *   arrays at the leaves.
     * @returns A `LazyIterator` of batches of elements, represented as an object
     *   with collections at the leaves.
     */
    columnMajorBatch(batchSize, smallLastBatch = true, 
    // tslint:disable-next-line:no-any
    zipFn = zipToList) {
        // First collect the desired number of input elements as a row-major batch.
        const rowBatches = this.rowMajorBatch(batchSize, smallLastBatch);
        // Now 'rotate' or 'pivot' the data, collecting all values from each column
        // in the batch (i.e., for each key within the elements) into an array.
        return rowBatches.map(x => deepZip(x, zipFn));
    }
    /**
     * Concatenate this `LazyIterator` with another.
     *
     * @param iterator A `LazyIterator` to be concatenated onto this one.
     * @param baseErrorHandler An optional function that can intercept `Error`s
     *   raised during a `next()` call on the base stream.  This function can
     *   decide whether the error should be propagated, whether the error should
     *   be ignored, or whether the base stream should be terminated.
     * @returns A `LazyIterator`.
     */
    concatenate(iterator, baseErrorHandler) {
        return new ChainedIterator(iteratorFromItems([this, iterator]), baseErrorHandler);
    }
    /**
     * Limits this stream to return at most `count` items.
     *
     * @param count The maximum number of items to provide from the stream. If
     * a negative or undefined value is given, the entire stream is returned
     *   unaltered.
     */
    take(count) {
        if (count < 0 || count == null) {
            return this;
        }
        return new TakeIterator(this, count);
    }
    /**
     * Skips the first `count` items in this stream.
     *
     * @param count The number of items to skip.  If a negative or undefined
     * value is given, the entire stream is returned unaltered.
     */
    skip(count) {
        if (count < 0 || count == null) {
            return this;
        }
        return new SkipIterator(this, count);
    }
    /**
     * Prefetch the first `bufferSize` items in this stream.
     *
     * Note this prefetches Promises, but makes no guarantees about when those
     * Promises resolve.
     *
     * @param bufferSize: An integer specifying the number of elements to be
     *   prefetched.
     */
    prefetch(bufferSize) {
        return new PrefetchIterator(this, bufferSize);
    }
    // TODO(soergel): deep sharded shuffle, where supported
    /**
     * Randomly shuffles the elements of this stream.
     *
     * @param bufferSize: An integer specifying the number of elements from
     * this stream from which the new stream will sample.
     * @param seed: (Optional.) An integer specifying the random seed that
     * will be used to create the distribution.
     */
    shuffle(windowSize, seed) {
        return new ShuffleIterator(this, windowSize, seed);
    }
    /**
     * Force an iterator to execute serially: each next() call will await the
     * prior one, so that they cannot execute concurrently.
     */
    serial() {
        return new SerialIterator(this);
    }
}
// ============================================================================
// The following private classes serve to implement the chainable methods
// on LazyIterator.  Unfortunately they can't be placed in separate files,
// due to resulting trouble with circular imports.
// ============================================================================
// Iterators that just extend LazyIterator directly
// ============================================================================
class ArrayIterator extends LazyIterator {
    constructor(items) {
        super();
        this.items = items;
        this.trav = 0;
    }
    summary() {
        return `Array of ${this.items.length} items`;
    }
    async next() {
        if (this.trav >= this.items.length) {
            return { value: null, done: true };
        }
        const item = this.items[this.trav];
        this.trav++;
        return { value: deepClone(item), done: false };
    }
}
class FunctionCallIterator extends LazyIterator {
    constructor(nextFn) {
        super();
        this.nextFn = nextFn;
    }
    summary() {
        return `Function call`;
    }
    async next() {
        try {
            return this.nextFn();
        }
        catch (e) {
            // Modify the error message but leave the stack trace intact
            e.message =
                `Error thrown while iterating through a dataset: ${e.message}`;
            throw e;
        }
    }
}
class SerialIterator extends LazyIterator {
    constructor(upstream) {
        super();
        this.upstream = upstream;
        this.lastRead = Promise.resolve({ value: null, done: false });
    }
    summary() {
        return `${this.upstream.summary()} -> Serial`;
    }
    async next() {
        // This sets this.lastRead to a new Promise right away, as opposed to
        // saying `await this.lastRead; this.lastRead = this.serialNext();` which
        // would not work because this.nextRead would be updated only after the
        // promise resolves.
        this.lastRead = this.lastRead.then(() => this.serialNext());
        return this.lastRead;
    }
    async serialNext() {
        return this.upstream.next();
    }
}
class SkipIterator extends LazyIterator {
    constructor(upstream, maxCount) {
        super();
        this.upstream = upstream;
        this.maxCount = maxCount;
        // Local state that should not be clobbered by out-of-order execution.
        this.count = 0;
        this.lastRead = Promise.resolve({ value: null, done: false });
    }
    summary() {
        return `${this.upstream.summary()} -> Skip`;
    }
    async next() {
        // This sets this.lastRead to a new Promise right away, as opposed to
        // saying `await this.lastRead; this.lastRead = this.serialNext();` which
        // would not work because this.nextRead would be updated only after the
        // promise resolves.
        this.lastRead = this.lastRead.then(() => this.serialNext());
        return this.lastRead;
    }
    async serialNext() {
        // TODO(soergel): consider tradeoffs of reading in parallel, eg.
        // collecting next() promises in an Array and then waiting for
        // Promise.all() of those. Benefit: pseudo-parallel execution.  Drawback:
        // maybe delayed GC.
        while (this.count++ < this.maxCount) {
            const skipped = await this.upstream.next();
            // short-circuit if upstream is already empty
            if (skipped.done) {
                return skipped;
            }
            tf.dispose(skipped.value);
        }
        return this.upstream.next();
    }
}
class TakeIterator extends LazyIterator {
    constructor(upstream, maxCount) {
        super();
        this.upstream = upstream;
        this.maxCount = maxCount;
        this.count = 0;
    }
    summary() {
        return `${this.upstream.summary()} -> Take`;
    }
    async next() {
        if (this.count++ >= this.maxCount) {
            return { value: null, done: true };
        }
        return this.upstream.next();
    }
}
// Note this batch just groups items into row-wise element arrays.
// Rotating these to a column-wise representation happens only at the dataset
// level.
class RowMajorBatchIterator extends LazyIterator {
    constructor(upstream, batchSize, enableSmallLastBatch = true) {
        super();
        this.upstream = upstream;
        this.batchSize = batchSize;
        this.enableSmallLastBatch = enableSmallLastBatch;
        this.lastRead = Promise.resolve({ value: null, done: false });
    }
    summary() {
        return `${this.upstream.summary()} -> RowMajorBatch`;
    }
    async next() {
        // This sets this.lastRead to a new Promise right away, as opposed to
        // saying `await this.lastRead; this.lastRead = this.serialNext();` which
        // would not work because this.nextRead would be updated only after the
        // promise resolves.
        this.lastRead = this.lastRead.then(() => this.serialNext());
        return this.lastRead;
    }
    async serialNext() {
        const batch = [];
        while (batch.length < this.batchSize) {
            const item = await this.upstream.next();
            if (item.done) {
                if (this.enableSmallLastBatch && batch.length > 0) {
                    return { value: batch, done: false };
                }
                return { value: null, done: true };
            }
            batch.push(item.value);
        }
        return { value: batch, done: false };
    }
}
class FilterIterator extends LazyIterator {
    constructor(upstream, predicate) {
        super();
        this.upstream = upstream;
        this.predicate = predicate;
        this.lastRead = Promise.resolve({ value: null, done: false });
    }
    summary() {
        return `${this.upstream.summary()} -> Filter`;
    }
    async next() {
        // This sets this.lastRead to a new Promise right away, as opposed to
        // saying `await this.lastRead; this.lastRead = this.serialNext();` which
        // would not work because this.nextRead would be updated only after the
        // promise resolves.
        this.lastRead = this.lastRead.then(() => this.serialNext());
        return this.lastRead;
    }
    async serialNext() {
        while (true) {
            const item = await this.upstream.next();
            if (item.done || this.predicate(item.value)) {
                return item;
            }
            tf.dispose(item.value);
        }
    }
}
class MapIterator extends LazyIterator {
    constructor(upstream, transform) {
        super();
        this.upstream = upstream;
        this.transform = transform;
    }
    summary() {
        return `${this.upstream.summary()} -> Map`;
    }
    async next() {
        const item = await this.upstream.next();
        if (item.done) {
            return { value: null, done: true };
        }
        const inputTensors = tf.tensor_util.getTensorsInContainer(item.value);
        // Careful: the transform may mutate the item in place.
        // That's why we have to remember the input Tensors above, and then
        // below dispose only those that were not passed through to the output.
        // Note too that the transform function is responsible for tidying
        // any intermediate Tensors.  Here we are concerned only about the
        // inputs.
        const mapped = this.transform(item.value);
        const outputTensors = tf.tensor_util.getTensorsInContainer(mapped);
        // TODO(soergel) faster intersection
        // TODO(soergel) move to tf.disposeExcept(in, out)?
        for (const t of inputTensors) {
            if (!tf.tensor_util.isTensorInList(t, outputTensors)) {
                t.dispose();
            }
        }
        return { value: mapped, done: false };
    }
}
class ErrorHandlingLazyIterator extends LazyIterator {
    constructor(upstream, handler) {
        super();
        this.upstream = upstream;
        this.handler = handler;
        this.count = 0;
        this.lastRead = Promise.resolve({ value: null, done: false });
    }
    summary() {
        return `${this.upstream.summary()} -> handleErrors`;
    }
    async next() {
        // This sets this.lastRead to a new Promise right away, as opposed to
        // saying `await this.lastRead; this.lastRead = this.serialNext();` which
        // would not work because this.nextRead would be updated only after the
        // promise resolves.
        this.lastRead = this.lastRead.then(() => this.serialNext());
        return this.lastRead;
    }
    async serialNext() {
        while (true) {
            try {
                return await this.upstream.next();
            }
            catch (e) {
                if (!this.handler(e)) {
                    return { value: null, done: true };
                }
                // If the handler returns true, loop and fetch the next upstream item.
                // If the upstream iterator throws an endless stream of errors, and if
                // the handler says to ignore them, then we loop forever here.  That is
                // the correct behavior-- it's up to the handler to decide when to stop.
            }
        }
    }
}
class AsyncMapIterator extends LazyIterator {
    constructor(upstream, transform) {
        super();
        this.upstream = upstream;
        this.transform = transform;
    }
    summary() {
        return `${this.upstream.summary()} -> AsyncMap`;
    }
    async next() {
        const item = await this.upstream.next();
        if (item.done) {
            return { value: null, done: true };
        }
        const inputTensors = tf.tensor_util.getTensorsInContainer(item.value);
        // Careful: the transform may mutate the item in place.
        // That's why we have to remember the input Tensors above, and then
        // below dispose only those that were not passed through to the output.
        // Note too that the transform function is responsible for tidying
        // any intermediate Tensors.  Here we are concerned only about the
        // inputs.
        const mapped = await this.transform(item.value);
        const outputTensors = tf.tensor_util.getTensorsInContainer(mapped);
        // TODO(soergel) faster intersection
        // TODO(soergel) move to tf.disposeExcept(in, out)?
        for (const t of inputTensors) {
            if (!tf.tensor_util.isTensorInList(t, outputTensors)) {
                t.dispose();
            }
        }
        return { value: mapped, done: false };
    }
}
// Iterators that maintain a queue of pending items
// ============================================================================
/**
 * A base class for transforming streams that operate by maintaining an
 * output queue of elements that are ready to return via next().  This is
 * commonly required when the transformation is 1-to-many:  A call to next()
 * may trigger a call to the underlying stream, which will produce many
 * mapped elements of this stream-- of which we need to return only one, so
 * we have to queue the rest.
 */
export class OneToManyIterator extends LazyIterator {
    constructor() {
        super();
        this.outputQueue = new GrowingRingBuffer();
        this.lastRead = Promise.resolve({ value: null, done: false });
    }
    async next() {
        // This sets this.lastRead to a new Promise right away, as opposed to
        // saying `await this.lastRead; this.lastRead = this.serialNext();` which
        // would not work because this.nextRead would be updated only after the
        // promise resolves.
        this.lastRead = this.lastRead.then(() => this.serialNext());
        return this.lastRead;
    }
    async serialNext() {
        // Fetch so that the queue contains at least one item if possible.
        // If the upstream source is exhausted, AND there are no items left in
        // the output queue, then this stream is also exhausted.
        while (this.outputQueue.length() === 0) {
            // TODO(soergel): consider parallel reads.
            if (!await this.pump()) {
                return { value: null, done: true };
            }
        }
        return { value: this.outputQueue.shift(), done: false };
    }
}
class FlatmapIterator extends OneToManyIterator {
    constructor(upstream, transform) {
        super();
        this.upstream = upstream;
        this.transform = transform;
    }
    summary() {
        return `${this.upstream.summary()} -> Flatmap`;
    }
    async pump() {
        const item = await this.upstream.next();
        if (item.done) {
            return false;
        }
        const inputTensors = tf.tensor_util.getTensorsInContainer(item.value);
        // Careful: the transform may mutate the item in place.
        // that's why we have to remember the input Tensors above, and then
        // below dispose only those that were not passed through to the output.
        // Note too that the transform function is responsible for tidying any
        // intermediate Tensors.  Here we are concerned only about the inputs.
        const mappedArray = this.transform(item.value);
        const outputTensors = tf.tensor_util.getTensorsInContainer(mappedArray);
        this.outputQueue.pushAll(mappedArray);
        // TODO(soergel) faster intersection, and deduplicate outputTensors
        // TODO(soergel) move to tf.disposeExcept(in, out)?
        for (const t of inputTensors) {
            if (!tf.tensor_util.isTensorInList(t, outputTensors)) {
                t.dispose();
            }
        }
        return true;
    }
}
/**
 * Provides a `LazyIterator` that concatenates a stream of underlying
 * streams.
 *
 * Doing this in a concurrency-safe way requires some trickery.  In
 * particular, we want this stream to return the elements from the
 * underlying streams in the correct order according to when next() was
 * called, even if the resulting Promises resolve in a different order.
 */
export class ChainedIterator extends LazyIterator {
    constructor(iterators, baseErrorHandler) {
        super();
        this.baseErrorHandler = baseErrorHandler;
        // Strict Promise execution order:
        // a next() call may not even begin until the previous one completes.
        this.lastRead = null;
        // Local state that should not be clobbered by out-of-order execution.
        this.iterator = null;
        this.moreIterators = iterators;
    }
    summary() {
        const upstreamSummaries = 'TODO: fill in upstream of chained summaries';
        return `${upstreamSummaries} -> Chained`;
    }
    async next() {
        this.lastRead = this.readFromChain(this.lastRead);
        return this.lastRead;
    }
    async readFromChain(lastRead) {
        // Must await on the previous read since the previous read may have advanced
        // the stream of streams, from which we need to read.
        // This is unfortunate since we can't parallelize reads. Which means
        // prefetching of chained streams is a no-op.
        // One solution is to prefetch immediately upstream of this.
        await lastRead;
        if (this.iterator == null) {
            const iteratorResult = await this.moreIterators.next();
            if (iteratorResult.done) {
                // No more streams to stream from.
                return { value: null, done: true };
            }
            this.iterator = iteratorResult.value;
            if (this.baseErrorHandler != null) {
                this.iterator = this.iterator.handleErrors(this.baseErrorHandler);
            }
        }
        const itemResult = await this.iterator.next();
        if (itemResult.done) {
            this.iterator = null;
            return this.readFromChain(lastRead);
        }
        return itemResult;
    }
}
export var ZipMismatchMode;
(function (ZipMismatchMode) {
    ZipMismatchMode[ZipMismatchMode["FAIL"] = 0] = "FAIL";
    ZipMismatchMode[ZipMismatchMode["SHORTEST"] = 1] = "SHORTEST";
    ZipMismatchMode[ZipMismatchMode["LONGEST"] = 2] = "LONGEST"; // use nulls for exhausted streams; use up the longest stream.
})(ZipMismatchMode || (ZipMismatchMode = {}));
/**
 * Provides a `LazyIterator` that zips together an array, dict, or nested
 * structure of `LazyIterator`s (and perhaps additional constants).
 *
 * The underlying streams must provide elements in a consistent order such
 * that they correspond.
 *
 * Typically, the underlying streams should have the same number of
 * elements. If they do not, the behavior is determined by the
 * `mismatchMode` argument.
 *
 * The nested structure of the `iterators` argument determines the
 * structure of elements in the resulting iterator.
 *
 * Doing this in a concurrency-safe way requires some trickery.  In
 * particular, we want this stream to return the elements from the
 * underlying streams in the correct order according to when next() was
 * called, even if the resulting Promises resolve in a different order.
 *
 * @param iterators: An array or object containing LazyIterators at the
 * leaves.
 * @param mismatchMode: Determines what to do when one underlying iterator
 * is exhausted before the others.  `ZipMismatchMode.FAIL` (the default)
 * causes an error to be thrown in this case.  `ZipMismatchMode.SHORTEST`
 * causes the zipped iterator to terminate with the furst underlying
 * streams, so elements remaining on the longer streams are ignored.
 * `ZipMismatchMode.LONGEST` causes the zipped stream to continue, filling
 * in nulls for the exhausted streams, until all streams are exhausted.
 */
class ZipIterator extends LazyIterator {
    constructor(iterators, mismatchMode = ZipMismatchMode.FAIL) {
        super();
        this.iterators = iterators;
        this.mismatchMode = mismatchMode;
        this.count = 0;
        this.currentPromise = null;
    }
    summary() {
        const upstreamSummaries = 'TODO: fill in upstream of zip summaries';
        return `{${upstreamSummaries}} -> Zip`;
    }
    async nextState(afterState) {
        // This chaining ensures that the underlying next() are not even called
        // before the previous ones have resolved.
        await afterState;
        // Collect underlying iterator "done" signals as a side effect in
        // getNext()
        let numIterators = 0;
        let iteratorsDone = 0;
        function getNext(container) {
            if (container instanceof LazyIterator) {
                const result = container.next();
                return {
                    value: result.then(x => {
                        numIterators++;
                        if (x.done) {
                            iteratorsDone++;
                        }
                        return x.value;
                    }),
                    recurse: false
                };
            }
            else {
                return { value: null, recurse: true };
            }
        }
        const mapped = await deepMapAndAwaitAll(this.iterators, getNext);
        if (numIterators === iteratorsDone) {
            // The streams have all ended.
            return { value: null, done: true };
        }
        if (iteratorsDone > 0) {
            switch (this.mismatchMode) {
                case ZipMismatchMode.FAIL:
                    throw new Error('Zipped streams should have the same length. ' +
                        `Mismatched at element ${this.count}.`);
                case ZipMismatchMode.SHORTEST:
                    return { value: null, done: true };
                case ZipMismatchMode.LONGEST:
                default:
                // Continue.  The exhausted streams already produced value: null.
            }
        }
        this.count++;
        return { value: mapped, done: false };
    }
    async next() {
        this.currentPromise = this.nextState(this.currentPromise);
        return this.currentPromise;
    }
}
// Iterators that maintain a ring buffer of pending promises
// ============================================================================
/**
 * A stream that prefetches a given number of items from an upstream source,
 * returning them in FIFO order.
 *
 * Note this prefetches Promises, but makes no guarantees about when those
 * Promises resolve.
 */
export class PrefetchIterator extends LazyIterator {
    constructor(upstream, bufferSize) {
        super();
        this.upstream = upstream;
        this.bufferSize = bufferSize;
        this.buffer = new RingBuffer(bufferSize);
    }
    summary() {
        return `${this.upstream.summary()} -> Prefetch`;
    }
    /**
     * Refill the prefetch buffer.  Returns only after the buffer is full, or
     * the upstream source is exhausted.
     */
    refill() {
        while (!this.buffer.isFull()) {
            const v = this.upstream.next();
            this.buffer.push(v);
        }
    }
    next() {
        this.refill();
        // This shift will never throw an error because the buffer is always
        // full after a refill. If the stream is exhausted, the buffer will be
        // full of Promises that will resolve to the end-of-stream signal.
        return this.buffer.shift();
    }
}
/**
 * A stream that performs a sliding-window random shuffle on an upstream
 * source. This is like a `PrefetchIterator` except that the items are
 * returned in randomized order.  Mixing naturally improves as the buffer
 * size increases.
 */
export class ShuffleIterator extends PrefetchIterator {
    constructor(upstream, windowSize, seed) {
        super(upstream, windowSize);
        this.upstream = upstream;
        this.windowSize = windowSize;
        // Local state that should not be clobbered by out-of-order execution.
        this.upstreamExhausted = false;
        this.random = seedrandom.alea(seed || tf.util.now().toString());
        this.lastRead = Promise.resolve({ value: null, done: false });
    }
    async next() {
        // This sets this.lastRead to a new Promise right away, as opposed to
        // saying `await this.lastRead; this.lastRead = this.serialNext();` which
        // would not work because this.nextRead would be updated only after the
        // promise resolves.
        this.lastRead = this.lastRead.then(() => this.serialNext());
        return this.lastRead;
    }
    randomInt(max) {
        return Math.floor(this.random() * max);
    }
    chooseIndex() {
        return this.randomInt(this.buffer.length());
    }
    async serialNext() {
        // TODO(soergel): consider performance
        if (!this.upstreamExhausted) {
            this.refill();
        }
        while (!this.buffer.isEmpty()) {
            const chosenIndex = this.chooseIndex();
            const result = await this.buffer.shuffleExcise(chosenIndex);
            if (result.done) {
                this.upstreamExhausted = true;
            }
            else {
                this.refill();
                return result;
            }
        }
        return { value: null, done: true };
    }
}
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* @license\n * Copyright 2018 Google LLC. All Rights Reserved.\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n * http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n *\n * =============================================================================\n */\n\nimport * as tf from '@tensorflow/tfjs-core';\nimport * as seedrandom from 'seedrandom';\n\nimport {Container} from '../types';\nimport {deepClone} from '../util/deep_clone';\nimport {deepMapAndAwaitAll, DeepMapAsyncResult, DeepMapResult, deepZip, zipToList} from '../util/deep_map';\nimport {GrowingRingBuffer} from '../util/growing_ring_buffer';\nimport {RingBuffer} from '../util/ring_buffer';\n\n/**\n * A nested structure of LazyIterators, used as the input to zip().\n */\nexport type IteratorContainer = Container<LazyIterator<tf.TensorContainer>>;\n\n// Here we implement a simple asynchronous iterator.\n// This lets us avoid using either third-party stream libraries or\n// recent TypeScript language support requiring polyfills.\n\n/**\n * Create a `LazyIterator` from an array of items.\n */\nexport function iteratorFromItems<T>(items: T[]): LazyIterator<T> {\n  return new ArrayIterator(items);\n}\n\n/**\n * Create a `LazyIterator` of incrementing integers.\n */\nexport function iteratorFromIncrementing(start: number): LazyIterator<number> {\n  let i = start;\n  return iteratorFromFunction(() => ({value: i++, done: false}));\n}\n\n/**\n * Create a `LazyIterator` from a function.\n *\n * ```js\n * let i = -1;\n * const func = () =>\n *    ++i < 5 ? {value: i, done: false} : {value: null, done: true};\n * const iter = tf.data.iteratorFromFunction(func);\n * await iter.forEachAsync(e => console.log(e));\n * ```\n *\n * @param func A function that produces data on each call.\n */\nexport function iteratorFromFunction<T>(\n    func: () =>\n        IteratorResult<T>| Promise<IteratorResult<T>>): LazyIterator<T> {\n  return new FunctionCallIterator(func);\n}\n\n/**\n * Create a `LazyIterator` by concatenating underlying streams, which are\n * themselves provided as a stream.\n *\n * This can also be thought of as a \"stream flatten\" operation.\n *\n * @param baseIterators A stream of streams to be concatenated.\n * @param baseErrorHandler An optional function that can intercept `Error`s\n *   raised during a `next()` call on the base stream.  This function can decide\n *   whether the error should be propagated, whether the error should be\n *   ignored, or whether the base stream should be terminated.\n */\nexport function iteratorFromConcatenated<T>(\n    baseIterators: LazyIterator<LazyIterator<T>>,\n    baseErrorHandler?: (e: Error) => boolean): LazyIterator<T> {\n  return new ChainedIterator(baseIterators, baseErrorHandler);\n}\n\n/**\n * Create a `LazyIterator` by concatenating streams produced by calling a\n * stream-generating function a given number of times.\n *\n * Since a `LazyIterator` is read-once, it cannot be repeated, but this\n * function can be used to achieve a similar effect:\n *\n *   LazyIterator.ofConcatenatedFunction(() => new MyIterator(), 6);\n *\n * @param iteratorFunc: A function that produces a new stream on each call.\n * @param count: The number of times to call the function.\n * @param baseErrorHandler An optional function that can intercept `Error`s\n *   raised during a `next()` call on the base stream.  This function can decide\n *   whether the error should be propagated, whether the error should be\n *   ignored, or whether the base stream should be terminated.\n */\nexport function iteratorFromConcatenatedFunction<T>(\n    iteratorFunc: () => IteratorResult<LazyIterator<T>>, count: number,\n    baseErrorHandler?: (e: Error) => boolean): LazyIterator<T> {\n  return iteratorFromConcatenated(\n      iteratorFromFunction(iteratorFunc).take(count), baseErrorHandler);\n}\n\n/**\n * Create a `LazyIterator` by zipping together an array, dict, or nested\n * structure of `LazyIterator`s (and perhaps additional constants).\n *\n * The underlying streams must provide elements in a consistent order such\n * that they correspond.\n *\n * Typically, the underlying streams should have the same number of\n * elements. If they do not, the behavior is determined by the\n * `mismatchMode` argument.\n *\n * The nested structure of the `iterators` argument determines the\n * structure of elements in the resulting iterator.\n *\n * @param iterators: An array or object containing LazyIterators at the\n * leaves.\n * @param mismatchMode: Determines what to do when one underlying iterator\n * is exhausted before the others.  `ZipMismatchMode.FAIL` (the default)\n * causes an error to be thrown in this case.  `ZipMismatchMode.SHORTEST`\n * causes the zipped iterator to terminate with the furst underlying\n * streams, so elements remaining on the longer streams are ignored.\n * `ZipMismatchMode.LONGEST` causes the zipped stream to continue, filling\n * in nulls for the exhausted streams, until all streams are exhausted.\n */\nexport function iteratorFromZipped<O extends tf.TensorContainer>(\n    iterators: IteratorContainer,\n    mismatchMode: ZipMismatchMode = ZipMismatchMode.FAIL): LazyIterator<O> {\n  return new ZipIterator<O>(iterators, mismatchMode);\n}\n\n/**\n * An asynchronous iterator, providing lazy access to a potentially\n * unbounded stream of elements.\n *\n * Iterator can be obtained from a dataset:\n * `const iter = await dataset.iterator();`\n */\nexport abstract class LazyIterator<T> {\n  // This class implements AsyncIterator<T>, but we have not yet set the\n  // TypeScript --downlevelIteration flag to enable that.\n\n  abstract summary(): string;\n\n  /**\n   * Returns a `Promise` for the next element in the stream.\n   *\n   * When an item can be provided successfully, the return value is\n   * `{value:T, done:false}`.\n   *\n   * Calling next() on a closed stream returns `{value:null, done:true}`.\n   */\n  abstract next(): Promise<IteratorResult<T>>;\n\n  /**\n   * Collect all remaining elements of a bounded stream into an array.\n   * Obviously this will succeed only for small streams that fit in memory.\n   * Useful for testing.\n   *\n   * @returns A Promise for an array of stream elements, which will resolve\n   *   when the stream is exhausted.\n   */\n  async toArray(): Promise<T[]> {\n    const result: T[] = [];\n    let x = await this.next();\n    while (!x.done) {\n      result.push(x.value);\n      x = await this.next();\n    }\n    return result;\n  }\n\n  /**\n   * Collect all elements of this dataset into an array with prefetching 100\n   * elements. This is useful for testing, because the prefetch changes the\n   * order in which the Promises are resolved along the processing pipeline.\n   * This may help expose bugs where results are dependent on the order of\n   * Promise resolution rather than on the logical order of the stream (i.e.,\n   * due to hidden mutable state).\n   *\n   * @returns A Promise for an array of stream elements, which will resolve\n   *   when the stream is exhausted.\n   */\n  async toArrayForTest(): Promise<T[]> {\n    const stream = this.prefetch(100);\n    const result: T[] = [];\n    let x = await stream.next();\n    while (!x.done) {\n      result.push(x.value);\n      x = await stream.next();\n    }\n    return result;\n  }\n\n  /**\n   * Draw items from the stream until it is exhausted.\n   *\n   * This can be useful when the stream has side effects but no output.  In\n   * that case, calling this function guarantees that the stream will be\n   * fully processed.\n   */\n  async resolveFully(): Promise<void> {\n    let x = await this.next();\n    while (!x.done) {\n      x = await this.next();\n    }\n  }\n\n  /**\n   * Draw items from the stream until it is exhausted, or a predicate fails.\n   *\n   * This can be useful when the stream has side effects but no output.  In\n   * that case, calling this function guarantees that the stream will be\n   * fully processed.\n   */\n  async resolveWhile(predicate: (r: T) => boolean): Promise<void> {\n    let x = await this.next();\n    let shouldContinue = predicate(x.value);\n    while ((!x.done) && shouldContinue) {\n      x = await this.next();\n      shouldContinue = predicate(x.value);\n    }\n  }\n\n  /**\n   * Handles errors thrown on this stream using a provided handler function.\n   *\n   * @param handler A function that handles any `Error` thrown during a `next()`\n   *   call and returns true if the stream should continue (dropping the failed\n   *   call) or false if the stream should quietly terminate.  If the handler\n   *   itself throws (or rethrows) an `Error`, that will be propagated.\n   *\n   * @returns A `LazyIterator` of elements passed through from upstream,\n   *   possibly filtering or terminating on upstream `next()` calls that\n   *   throw an `Error`.\n   */\n  handleErrors(handler: (error: Error) => boolean): LazyIterator<T> {\n    return new ErrorHandlingLazyIterator(this, handler);\n  }\n\n  // TODO(soergel): Implement reduce() etc.\n\n  /**\n   * Filters this stream according to `predicate`.\n   *\n   * @param predicate A function mapping a stream element to a boolean or a\n   * `Promise` for one.\n   *\n   * @returns A `LazyIterator` of elements for which the predicate was true.\n   */\n  filter(predicate: (value: T) => boolean): LazyIterator<T> {\n    return new FilterIterator(this, predicate);\n  }\n\n  /**\n   * Maps this stream through a 1-to-1 transform.\n   *\n   * @param transform A function mapping a stream element to a transformed\n   *   element.\n   *\n   * @returns A `LazyIterator` of transformed elements.\n   */\n  map<O>(transform: (value: T) => O): LazyIterator<O> {\n    return new MapIterator(this, transform);\n  }\n\n  /**\n   * Maps this stream through an async 1-to-1 transform.\n   *\n   * @param transform A function mapping a stream element to a `Promise` for a\n   *   transformed stream element.\n   *\n   * @returns A `LazyIterator` of transformed elements.\n   */\n  mapAsync<O>(transform: (value: T) => Promise<O>): LazyIterator<O> {\n    return new AsyncMapIterator(this, transform);\n  }\n\n  /**\n   * Maps this stream through a 1-to-1 transform, forcing serial execution.\n   *\n   * @param transform A function mapping a stream element to a transformed\n   *   element.\n   *\n   * @returns A `LazyIterator` of transformed elements.\n   */\n  serialMapAsync<O>(transform: (value: T) => Promise<O>): LazyIterator<O> {\n    return new AsyncMapIterator(this, transform).serial();\n  }\n\n  /**\n   * Maps this stream through a 1-to-many transform.\n   *\n   * @param transform A function mapping a stream element to an array of\n   *   transformed elements.\n   *\n   * @returns A `DataStream` of transformed elements.\n   */\n  flatmap<O>(transform: (value: T) => O[]): LazyIterator<O> {\n    return new FlatmapIterator(this, transform);\n  }\n\n  /**\n   * Apply a function to every element of the stream.\n   *\n   * @param f A function to apply to each stream element.\n   */\n  async forEachAsync(f: (value: T) => void): Promise<void> {\n    return this.map(f).resolveFully();\n  }\n\n  /**\n   * Apply a function to every element of the stream, forcing serial execution.\n   *\n   * @param f A function to apply to each stream element.  Should return 'true'\n   *   to indicate that the stream should continue, or 'false' to cause it to\n   *   terminate.\n   */\n  async serialForEach(f: (value: T) => Promise<boolean>): Promise<void> {\n    return this.serialMapAsync(f).resolveWhile(x => (x === true));\n  }\n\n  /**\n   * Groups elements into batches, represented as arrays of elements.\n   *\n   * We can think of the elements of this iterator as 'rows' (even if they are\n   * nested structures).  By the same token, consecutive values for a given\n   * key within the elements form a 'column'.  This matches the usual sense of\n   * 'row' and 'column' when processing tabular data (e.g., parsing a CSV).\n   *\n   * Thus, \"Row-major\" means that the resulting batch is simply a collection of\n   * rows: `[row1, row2, row3, ...]`.  This is contrast to the column-major\n   * form, which is needed for vectorized computation.\n   *\n   * @param batchSize The number of elements desired per batch.\n   * @param smallLastBatch Whether to emit the final batch when it has fewer\n   *   than batchSize elements. Default true.\n   * @returns A `LazyIterator` of batches of elements, represented as arrays\n   *   of the original element type.\n   */\n  rowMajorBatch(batchSize: number, smallLastBatch = true): LazyIterator<T[]> {\n    return new RowMajorBatchIterator(this, batchSize, smallLastBatch);\n  }\n\n  /**\n   * Groups elements into batches, represented in column-major form.\n   *\n   * We can think of the elements of this iterator as 'rows' (even if they are\n   * nested structures).  By the same token, consecutive values for a given\n   * key within the elements form a 'column'.  This matches the usual sense of\n   * 'row' and 'column' when processing tabular data (e.g., parsing a CSV).\n   *\n   * Thus, \"column-major\" means that the resulting batch is a (potentially\n   * nested) structure representing the columns.  Each column entry, then,\n   * contains a collection of the values found in that column for a range of\n   * input elements.  This representation allows for vectorized computation, in\n   * contrast to the row-major form.\n   *\n   * The inputs should all have the same nested structure (i.e., of arrays and\n   * dicts).  The result is a single object with the same nested structure,\n   * where the leaves are arrays collecting the values of the inputs at that\n   * location (or, optionally, the result of a custom function applied to those\n   * arrays).\n   *\n   * @param batchSize The number of elements desired per batch.\n   * @param smallLastBatch Whether to emit the final batch when it has fewer\n   *   than batchSize elements. Default true.\n   * @param zipFn: (optional) A function that expects an array of elements at a\n   *   single node of the object tree, and returns a `DeepMapResult`.  The\n   *   `DeepMapResult` either provides a result value for that node (i.e.,\n   *   representing the subtree), or indicates that the node should be processed\n   *   recursively.  The default zipFn recurses as far as possible and places\n   *   arrays at the leaves.\n   * @returns A `LazyIterator` of batches of elements, represented as an object\n   *   with collections at the leaves.\n   */\n  columnMajorBatch(\n      batchSize: number, smallLastBatch = true,\n      // tslint:disable-next-line:no-any\n      zipFn: (xs: any[]) => DeepMapResult = zipToList):\n      LazyIterator<tf.TensorContainer> {\n    // First collect the desired number of input elements as a row-major batch.\n    const rowBatches = this.rowMajorBatch(batchSize, smallLastBatch);\n    // Now 'rotate' or 'pivot' the data, collecting all values from each column\n    // in the batch (i.e., for each key within the elements) into an array.\n    return rowBatches.map(x => deepZip(x, zipFn));\n  }\n\n  /**\n   * Concatenate this `LazyIterator` with another.\n   *\n   * @param iterator A `LazyIterator` to be concatenated onto this one.\n   * @param baseErrorHandler An optional function that can intercept `Error`s\n   *   raised during a `next()` call on the base stream.  This function can\n   *   decide whether the error should be propagated, whether the error should\n   *   be ignored, or whether the base stream should be terminated.\n   * @returns A `LazyIterator`.\n   */\n  concatenate(\n      iterator: LazyIterator<T>,\n      baseErrorHandler?: (e: Error) => boolean): LazyIterator<T> {\n    return new ChainedIterator(\n        iteratorFromItems([this, iterator]), baseErrorHandler);\n  }\n\n  /**\n   * Limits this stream to return at most `count` items.\n   *\n   * @param count The maximum number of items to provide from the stream. If\n   * a negative or undefined value is given, the entire stream is returned\n   *   unaltered.\n   */\n  take(count: number): LazyIterator<T> {\n    if (count < 0 || count == null) {\n      return this;\n    }\n    return new TakeIterator(this, count);\n  }\n\n  /**\n   * Skips the first `count` items in this stream.\n   *\n   * @param count The number of items to skip.  If a negative or undefined\n   * value is given, the entire stream is returned unaltered.\n   */\n  skip(count: number): LazyIterator<T> {\n    if (count < 0 || count == null) {\n      return this;\n    }\n    return new SkipIterator(this, count);\n  }\n\n  /**\n   * Prefetch the first `bufferSize` items in this stream.\n   *\n   * Note this prefetches Promises, but makes no guarantees about when those\n   * Promises resolve.\n   *\n   * @param bufferSize: An integer specifying the number of elements to be\n   *   prefetched.\n   */\n  prefetch(bufferSize: number): LazyIterator<T> {\n    return new PrefetchIterator(this, bufferSize);\n  }\n\n  // TODO(soergel): deep sharded shuffle, where supported\n\n  /**\n   * Randomly shuffles the elements of this stream.\n   *\n   * @param bufferSize: An integer specifying the number of elements from\n   * this stream from which the new stream will sample.\n   * @param seed: (Optional.) An integer specifying the random seed that\n   * will be used to create the distribution.\n   */\n  shuffle(windowSize: number, seed?: string): LazyIterator<T> {\n    return new ShuffleIterator(this, windowSize, seed);\n  }\n\n  /**\n   * Force an iterator to execute serially: each next() call will await the\n   * prior one, so that they cannot execute concurrently.\n   */\n  serial(): LazyIterator<T> {\n    return new SerialIterator(this);\n  }\n}\n\n// ============================================================================\n// The following private classes serve to implement the chainable methods\n// on LazyIterator.  Unfortunately they can't be placed in separate files,\n// due to resulting trouble with circular imports.\n// ============================================================================\n\n// Iterators that just extend LazyIterator directly\n// ============================================================================\n\nclass ArrayIterator<T> extends LazyIterator<T> {\n  private trav = 0;\n  constructor(protected items: T[]) {\n    super();\n  }\n\n  summary() {\n    return `Array of ${this.items.length} items`;\n  }\n\n  async next(): Promise<IteratorResult<T>> {\n    if (this.trav >= this.items.length) {\n      return {value: null, done: true};\n    }\n    const item = this.items[this.trav];\n    this.trav++;\n    return {value: deepClone(item), done: false};\n  }\n}\n\nclass FunctionCallIterator<T> extends LazyIterator<T> {\n  constructor(\n      protected nextFn: () => IteratorResult<T>| Promise<IteratorResult<T>>) {\n    super();\n  }\n\n  summary() {\n    return `Function call`;\n  }\n\n  async next(): Promise<IteratorResult<T>> {\n    try {\n      return this.nextFn();\n    } catch (e) {\n      // Modify the error message but leave the stack trace intact\n      e.message =\n          `Error thrown while iterating through a dataset: ${e.message}`;\n      throw e;\n    }\n  }\n}\n\nclass SerialIterator<T> extends LazyIterator<T> {\n  // Strict Promise execution order:\n  // a next() call may not even begin until the previous one completes.\n  private lastRead: Promise<IteratorResult<T>>;\n\n  constructor(protected upstream: LazyIterator<T>) {\n    super();\n    this.lastRead = Promise.resolve({value: null, done: false});\n  }\n\n  summary() {\n    return `${this.upstream.summary()} -> Serial`;\n  }\n\n  async next(): Promise<IteratorResult<T>> {\n    // This sets this.lastRead to a new Promise right away, as opposed to\n    // saying `await this.lastRead; this.lastRead = this.serialNext();` which\n    // would not work because this.nextRead would be updated only after the\n    // promise resolves.\n    this.lastRead = this.lastRead.then(() => this.serialNext());\n    return this.lastRead;\n  }\n\n  private async serialNext(): Promise<IteratorResult<T>> {\n    return this.upstream.next();\n  }\n}\n\nclass SkipIterator<T> extends LazyIterator<T> {\n  // Strict Promise execution order:\n  // a next() call may not even begin until the previous one completes.\n  private lastRead: Promise<IteratorResult<T>>;\n\n  // Local state that should not be clobbered by out-of-order execution.\n  count = 0;\n\n  constructor(protected upstream: LazyIterator<T>, protected maxCount: number) {\n    super();\n    this.lastRead = Promise.resolve({value: null, done: false});\n  }\n\n  summary() {\n    return `${this.upstream.summary()} -> Skip`;\n  }\n\n  async next(): Promise<IteratorResult<T>> {\n    // This sets this.lastRead to a new Promise right away, as opposed to\n    // saying `await this.lastRead; this.lastRead = this.serialNext();` which\n    // would not work because this.nextRead would be updated only after the\n    // promise resolves.\n    this.lastRead = this.lastRead.then(() => this.serialNext());\n    return this.lastRead;\n  }\n\n  private async serialNext(): Promise<IteratorResult<T>> {\n    // TODO(soergel): consider tradeoffs of reading in parallel, eg.\n    // collecting next() promises in an Array and then waiting for\n    // Promise.all() of those. Benefit: pseudo-parallel execution.  Drawback:\n    // maybe delayed GC.\n    while (this.count++ < this.maxCount) {\n      const skipped = await this.upstream.next();\n      // short-circuit if upstream is already empty\n      if (skipped.done) {\n        return skipped;\n      }\n      tf.dispose(skipped.value as {});\n    }\n    return this.upstream.next();\n  }\n}\n\nclass TakeIterator<T> extends LazyIterator<T> {\n  count = 0;\n  constructor(protected upstream: LazyIterator<T>, protected maxCount: number) {\n    super();\n  }\n\n  summary() {\n    return `${this.upstream.summary()} -> Take`;\n  }\n\n  async next(): Promise<IteratorResult<T>> {\n    if (this.count++ >= this.maxCount) {\n      return {value: null, done: true};\n    }\n    return this.upstream.next();\n  }\n}\n\n// Note this batch just groups items into row-wise element arrays.\n// Rotating these to a column-wise representation happens only at the dataset\n// level.\nclass RowMajorBatchIterator<T> extends LazyIterator<T[]> {\n  // Strict Promise execution order:\n  // a next() call may not even begin until the previous one completes.\n  private lastRead: Promise<IteratorResult<T[]>>;\n\n  constructor(\n      protected upstream: LazyIterator<T>, protected batchSize: number,\n      protected enableSmallLastBatch = true) {\n    super();\n    this.lastRead = Promise.resolve({value: null, done: false});\n  }\n\n  summary() {\n    return `${this.upstream.summary()} -> RowMajorBatch`;\n  }\n\n  async next(): Promise<IteratorResult<T[]>> {\n    // This sets this.lastRead to a new Promise right away, as opposed to\n    // saying `await this.lastRead; this.lastRead = this.serialNext();` which\n    // would not work because this.nextRead would be updated only after the\n    // promise resolves.\n    this.lastRead = this.lastRead.then(() => this.serialNext());\n    return this.lastRead;\n  }\n\n  private async serialNext(): Promise<IteratorResult<T[]>> {\n    const batch: T[] = [];\n    while (batch.length < this.batchSize) {\n      const item = await this.upstream.next();\n      if (item.done) {\n        if (this.enableSmallLastBatch && batch.length > 0) {\n          return {value: batch, done: false};\n        }\n        return {value: null, done: true};\n      }\n      batch.push(item.value);\n    }\n    return {value: batch, done: false};\n  }\n}\n\nclass FilterIterator<T> extends LazyIterator<T> {\n  // Strict Promise execution order:\n  // a next() call may not even begin until the previous one completes.\n  private lastRead: Promise<IteratorResult<T>>;\n\n  constructor(\n      protected upstream: LazyIterator<T>,\n      protected predicate: (value: T) => boolean) {\n    super();\n    this.lastRead = Promise.resolve({value: null, done: false});\n  }\n\n  summary() {\n    return `${this.upstream.summary()} -> Filter`;\n  }\n\n  async next(): Promise<IteratorResult<T>> {\n    // This sets this.lastRead to a new Promise right away, as opposed to\n    // saying `await this.lastRead; this.lastRead = this.serialNext();` which\n    // would not work because this.nextRead would be updated only after the\n    // promise resolves.\n    this.lastRead = this.lastRead.then(() => this.serialNext());\n    return this.lastRead;\n  }\n\n  private async serialNext(): Promise<IteratorResult<T>> {\n    while (true) {\n      const item = await this.upstream.next();\n      if (item.done || this.predicate(item.value)) {\n        return item;\n      }\n      tf.dispose(item.value as {});\n    }\n  }\n}\n\nclass MapIterator<I, O> extends LazyIterator<O> {\n  constructor(\n      protected upstream: LazyIterator<I>,\n      protected transform: (value: I) => O) {\n    super();\n  }\n\n  summary() {\n    return `${this.upstream.summary()} -> Map`;\n  }\n\n  async next(): Promise<IteratorResult<O>> {\n    const item = await this.upstream.next();\n    if (item.done) {\n      return {value: null, done: true};\n    }\n    const inputTensors = tf.tensor_util.getTensorsInContainer(item.value as {});\n    // Careful: the transform may mutate the item in place.\n    // That's why we have to remember the input Tensors above, and then\n    // below dispose only those that were not passed through to the output.\n    // Note too that the transform function is responsible for tidying\n    // any intermediate Tensors.  Here we are concerned only about the\n    // inputs.\n    const mapped = this.transform(item.value);\n    const outputTensors = tf.tensor_util.getTensorsInContainer(mapped as {});\n\n    // TODO(soergel) faster intersection\n    // TODO(soergel) move to tf.disposeExcept(in, out)?\n    for (const t of inputTensors) {\n      if (!tf.tensor_util.isTensorInList(t, outputTensors)) {\n        t.dispose();\n      }\n    }\n    return {value: mapped, done: false};\n  }\n}\n\nclass ErrorHandlingLazyIterator<T> extends LazyIterator<T> {\n  count = 0;\n  constructor(\n      protected upstream: LazyIterator<T>,\n      protected handler: (error: Error) => boolean) {\n    super();\n    this.lastRead = Promise.resolve({value: null, done: false});\n  }\n\n  summary() {\n    return `${this.upstream.summary()} -> handleErrors`;\n  }\n\n  // Strict Promise execution order:\n  // a next() call may not even begin until the previous one completes.\n  private lastRead: Promise<IteratorResult<T>>;\n\n  async next(): Promise<IteratorResult<T>> {\n    // This sets this.lastRead to a new Promise right away, as opposed to\n    // saying `await this.lastRead; this.lastRead = this.serialNext();` which\n    // would not work because this.nextRead would be updated only after the\n    // promise resolves.\n    this.lastRead = this.lastRead.then(() => this.serialNext());\n    return this.lastRead;\n  }\n\n  async serialNext(): Promise<IteratorResult<T>> {\n    while (true) {\n      try {\n        return await this.upstream.next();\n      } catch (e) {\n        if (!this.handler(e)) {\n          return {value: null, done: true};\n        }\n        // If the handler returns true, loop and fetch the next upstream item.\n\n        // If the upstream iterator throws an endless stream of errors, and if\n        // the handler says to ignore them, then we loop forever here.  That is\n        // the correct behavior-- it's up to the handler to decide when to stop.\n      }\n    }\n  }\n}\n\nclass AsyncMapIterator<I, O> extends LazyIterator<O> {\n  constructor(\n      protected upstream: LazyIterator<I>,\n      protected transform: (value: I) => Promise<O>) {\n    super();\n  }\n\n  summary() {\n    return `${this.upstream.summary()} -> AsyncMap`;\n  }\n\n  async next(): Promise<IteratorResult<O>> {\n    const item = await this.upstream.next();\n    if (item.done) {\n      return {value: null, done: true};\n    }\n    const inputTensors = tf.tensor_util.getTensorsInContainer(item.value as {});\n    // Careful: the transform may mutate the item in place.\n    // That's why we have to remember the input Tensors above, and then\n    // below dispose only those that were not passed through to the output.\n    // Note too that the transform function is responsible for tidying\n    // any intermediate Tensors.  Here we are concerned only about the\n    // inputs.\n    const mapped = await this.transform(item.value);\n    const outputTensors = tf.tensor_util.getTensorsInContainer(mapped as {});\n\n    // TODO(soergel) faster intersection\n    // TODO(soergel) move to tf.disposeExcept(in, out)?\n    for (const t of inputTensors) {\n      if (!tf.tensor_util.isTensorInList(t, outputTensors)) {\n        t.dispose();\n      }\n    }\n    return {value: mapped, done: false};\n  }\n}\n\n// Iterators that maintain a queue of pending items\n// ============================================================================\n\n/**\n * A base class for transforming streams that operate by maintaining an\n * output queue of elements that are ready to return via next().  This is\n * commonly required when the transformation is 1-to-many:  A call to next()\n * may trigger a call to the underlying stream, which will produce many\n * mapped elements of this stream-- of which we need to return only one, so\n * we have to queue the rest.\n */\nexport abstract class OneToManyIterator<T> extends LazyIterator<T> {\n  // Strict Promise execution order:\n  // a next() call may not even begin until the previous one completes.\n  private lastRead: Promise<IteratorResult<T>>;\n\n  // Local state that should not be clobbered by out-of-order execution.\n  protected outputQueue: RingBuffer<T>;\n\n  constructor() {\n    super();\n    this.outputQueue = new GrowingRingBuffer<T>();\n    this.lastRead = Promise.resolve({value: null, done: false});\n  }\n\n  async next(): Promise<IteratorResult<T>> {\n    // This sets this.lastRead to a new Promise right away, as opposed to\n    // saying `await this.lastRead; this.lastRead = this.serialNext();` which\n    // would not work because this.nextRead would be updated only after the\n    // promise resolves.\n    this.lastRead = this.lastRead.then(() => this.serialNext());\n    return this.lastRead;\n  }\n\n  /**\n   * Read one or more chunks from upstream and process them, possibly\n   * reading or writing a carryover, and adding processed items to the\n   * output queue.  Note it's possible that no items are added to the queue\n   * on a given pump() call, even if the upstream stream is not closed\n   * (e.g., because items are filtered).\n   *\n   * @return `true` if any action was taken, i.e. fetching items from the\n   *   upstream source OR adding items to the output queue.  `false` if the\n   *   upstream source is exhausted AND nothing was added to the queue\n   * (i.e., any remaining carryover).\n   */\n  protected abstract pump(): Promise<boolean>;\n\n  async serialNext(): Promise<IteratorResult<T>> {\n    // Fetch so that the queue contains at least one item if possible.\n    // If the upstream source is exhausted, AND there are no items left in\n    // the output queue, then this stream is also exhausted.\n    while (this.outputQueue.length() === 0) {\n      // TODO(soergel): consider parallel reads.\n      if (!await this.pump()) {\n        return {value: null, done: true};\n      }\n    }\n    return {value: this.outputQueue.shift(), done: false};\n  }\n}\nclass FlatmapIterator<I, O> extends OneToManyIterator<O> {\n  constructor(\n      protected upstream: LazyIterator<I>,\n      protected transform: (value: I) => O[]) {\n    super();\n  }\n\n  summary() {\n    return `${this.upstream.summary()} -> Flatmap`;\n  }\n\n  async pump(): Promise<boolean> {\n    const item = await this.upstream.next();\n    if (item.done) {\n      return false;\n    }\n    const inputTensors = tf.tensor_util.getTensorsInContainer(item.value as {});\n    // Careful: the transform may mutate the item in place.\n    // that's why we have to remember the input Tensors above, and then\n    // below dispose only those that were not passed through to the output.\n    // Note too that the transform function is responsible for tidying any\n    // intermediate Tensors.  Here we are concerned only about the inputs.\n    const mappedArray = this.transform(item.value);\n    const outputTensors =\n        tf.tensor_util.getTensorsInContainer(mappedArray as {});\n    this.outputQueue.pushAll(mappedArray);\n\n    // TODO(soergel) faster intersection, and deduplicate outputTensors\n    // TODO(soergel) move to tf.disposeExcept(in, out)?\n    for (const t of inputTensors) {\n      if (!tf.tensor_util.isTensorInList(t, outputTensors)) {\n        t.dispose();\n      }\n    }\n\n    return true;\n  }\n}\n\n/**\n * Provides a `LazyIterator` that concatenates a stream of underlying\n * streams.\n *\n * Doing this in a concurrency-safe way requires some trickery.  In\n * particular, we want this stream to return the elements from the\n * underlying streams in the correct order according to when next() was\n * called, even if the resulting Promises resolve in a different order.\n */\nexport class ChainedIterator<T> extends LazyIterator<T> {\n  // Strict Promise execution order:\n  // a next() call may not even begin until the previous one completes.\n  private lastRead: Promise<IteratorResult<T>> = null;\n\n  // Local state that should not be clobbered by out-of-order execution.\n  private iterator: LazyIterator<T> = null;\n  private moreIterators: LazyIterator<LazyIterator<T>>;\n\n  constructor(\n      iterators: LazyIterator<LazyIterator<T>>,\n      private readonly baseErrorHandler?: (e: Error) => boolean) {\n    super();\n    this.moreIterators = iterators;\n  }\n\n  summary() {\n    const upstreamSummaries = 'TODO: fill in upstream of chained summaries';\n    return `${upstreamSummaries} -> Chained`;\n  }\n\n  async next(): Promise<IteratorResult<T>> {\n    this.lastRead = this.readFromChain(this.lastRead);\n    return this.lastRead;\n  }\n\n  private async readFromChain(lastRead: Promise<IteratorResult<T>>):\n      Promise<IteratorResult<T>> {\n    // Must await on the previous read since the previous read may have advanced\n    // the stream of streams, from which we need to read.\n    // This is unfortunate since we can't parallelize reads. Which means\n    // prefetching of chained streams is a no-op.\n    // One solution is to prefetch immediately upstream of this.\n    await lastRead;\n    if (this.iterator == null) {\n      const iteratorResult = await this.moreIterators.next();\n      if (iteratorResult.done) {\n        // No more streams to stream from.\n        return {value: null, done: true};\n      }\n      this.iterator = iteratorResult.value;\n      if (this.baseErrorHandler != null) {\n        this.iterator = this.iterator.handleErrors(this.baseErrorHandler);\n      }\n    }\n    const itemResult = await this.iterator.next();\n    if (itemResult.done) {\n      this.iterator = null;\n      return this.readFromChain(lastRead);\n    }\n    return itemResult;\n  }\n}\n\nexport enum ZipMismatchMode {\n  FAIL,      // require zipped streams to have the same length\n  SHORTEST,  // terminate zip when the first stream is exhausted\n  LONGEST    // use nulls for exhausted streams; use up the longest stream.\n}\n\n/**\n * Provides a `LazyIterator` that zips together an array, dict, or nested\n * structure of `LazyIterator`s (and perhaps additional constants).\n *\n * The underlying streams must provide elements in a consistent order such\n * that they correspond.\n *\n * Typically, the underlying streams should have the same number of\n * elements. If they do not, the behavior is determined by the\n * `mismatchMode` argument.\n *\n * The nested structure of the `iterators` argument determines the\n * structure of elements in the resulting iterator.\n *\n * Doing this in a concurrency-safe way requires some trickery.  In\n * particular, we want this stream to return the elements from the\n * underlying streams in the correct order according to when next() was\n * called, even if the resulting Promises resolve in a different order.\n *\n * @param iterators: An array or object containing LazyIterators at the\n * leaves.\n * @param mismatchMode: Determines what to do when one underlying iterator\n * is exhausted before the others.  `ZipMismatchMode.FAIL` (the default)\n * causes an error to be thrown in this case.  `ZipMismatchMode.SHORTEST`\n * causes the zipped iterator to terminate with the furst underlying\n * streams, so elements remaining on the longer streams are ignored.\n * `ZipMismatchMode.LONGEST` causes the zipped stream to continue, filling\n * in nulls for the exhausted streams, until all streams are exhausted.\n */\nclass ZipIterator<O extends tf.TensorContainer> extends LazyIterator<O> {\n  private count = 0;\n  private currentPromise: Promise<IteratorResult<O>> = null;\n\n  constructor(\n      protected readonly iterators: IteratorContainer,\n      protected readonly mismatchMode: ZipMismatchMode = ZipMismatchMode.FAIL) {\n    super();\n  }\n\n  summary() {\n    const upstreamSummaries = 'TODO: fill in upstream of zip summaries';\n    return `{${upstreamSummaries}} -> Zip`;\n  }\n\n  private async nextState(afterState: Promise<IteratorResult<O>>):\n      Promise<IteratorResult<O>> {\n    // This chaining ensures that the underlying next() are not even called\n    // before the previous ones have resolved.\n    await afterState;\n\n    // Collect underlying iterator \"done\" signals as a side effect in\n    // getNext()\n    let numIterators = 0;\n    let iteratorsDone = 0;\n\n    function getNext(container: IteratorContainer): DeepMapAsyncResult {\n      if (container instanceof LazyIterator) {\n        const result = container.next();\n        return {\n          value: result.then(x => {\n            numIterators++;\n            if (x.done) {\n              iteratorsDone++;\n            }\n            return x.value;\n          }),\n          recurse: false\n        };\n      } else {\n        return {value: null, recurse: true};\n      }\n    }\n\n    const mapped: O = await deepMapAndAwaitAll(this.iterators, getNext);\n\n    if (numIterators === iteratorsDone) {\n      // The streams have all ended.\n      return {value: null, done: true};\n    }\n    if (iteratorsDone > 0) {\n      switch (this.mismatchMode) {\n        case ZipMismatchMode.FAIL:\n          throw new Error(\n              'Zipped streams should have the same length. ' +\n              `Mismatched at element ${this.count}.`);\n        case ZipMismatchMode.SHORTEST:\n          return {value: null, done: true};\n        case ZipMismatchMode.LONGEST:\n        default:\n          // Continue.  The exhausted streams already produced value: null.\n      }\n    }\n\n    this.count++;\n    return {value: mapped, done: false};\n  }\n\n  async next(): Promise<IteratorResult<O>> {\n    this.currentPromise = this.nextState(this.currentPromise);\n    return this.currentPromise;\n  }\n}\n\n// Iterators that maintain a ring buffer of pending promises\n// ============================================================================\n\n/**\n * A stream that prefetches a given number of items from an upstream source,\n * returning them in FIFO order.\n *\n * Note this prefetches Promises, but makes no guarantees about when those\n * Promises resolve.\n */\nexport class PrefetchIterator<T> extends LazyIterator<T> {\n  protected buffer: RingBuffer<Promise<IteratorResult<T>>>;\n\n  constructor(\n      protected upstream: LazyIterator<T>, protected bufferSize: number) {\n    super();\n    this.buffer = new RingBuffer<Promise<IteratorResult<T>>>(bufferSize);\n  }\n\n  summary() {\n    return `${this.upstream.summary()} -> Prefetch`;\n  }\n\n  /**\n   * Refill the prefetch buffer.  Returns only after the buffer is full, or\n   * the upstream source is exhausted.\n   */\n  protected refill() {\n    while (!this.buffer.isFull()) {\n      const v = this.upstream.next();\n      this.buffer.push(v);\n    }\n  }\n\n  next(): Promise<IteratorResult<T>> {\n    this.refill();\n    // This shift will never throw an error because the buffer is always\n    // full after a refill. If the stream is exhausted, the buffer will be\n    // full of Promises that will resolve to the end-of-stream signal.\n    return this.buffer.shift();\n  }\n}\n\n/**\n * A stream that performs a sliding-window random shuffle on an upstream\n * source. This is like a `PrefetchIterator` except that the items are\n * returned in randomized order.  Mixing naturally improves as the buffer\n * size increases.\n */\nexport class ShuffleIterator<T> extends PrefetchIterator<T> {\n  private readonly random: seedrandom.prng;\n\n  // Strict Promise execution order:\n  // a next() call may not even begin until the previous one completes.\n  private lastRead: Promise<IteratorResult<T>>;\n\n  // Local state that should not be clobbered by out-of-order execution.\n  private upstreamExhausted = false;\n\n  constructor(\n    protected override upstream: LazyIterator<T>, protected windowSize: number,\n      seed?: string) {\n    super(upstream, windowSize);\n    this.random = seedrandom.alea(seed || tf.util.now().toString());\n    this.lastRead = Promise.resolve({value: null, done: false});\n  }\n\n  override async next(): Promise<IteratorResult<T>> {\n    // This sets this.lastRead to a new Promise right away, as opposed to\n    // saying `await this.lastRead; this.lastRead = this.serialNext();` which\n    // would not work because this.nextRead would be updated only after the\n    // promise resolves.\n    this.lastRead = this.lastRead.then(() => this.serialNext());\n    return this.lastRead;\n  }\n\n  private randomInt(max: number) {\n    return Math.floor(this.random() * max);\n  }\n\n  protected chooseIndex(): number {\n    return this.randomInt(this.buffer.length());\n  }\n\n  async serialNext(): Promise<IteratorResult<T>> {\n    // TODO(soergel): consider performance\n    if (!this.upstreamExhausted) {\n      this.refill();\n    }\n    while (!this.buffer.isEmpty()) {\n      const chosenIndex = this.chooseIndex();\n      const result = await this.buffer.shuffleExcise(chosenIndex);\n      if (result.done) {\n        this.upstreamExhausted = true;\n      } else {\n        this.refill();\n        return result;\n      }\n    }\n    return {value: null, done: true};\n  }\n}\n"]}