/**
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* @license
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* Copyright 2018 Google LLC. All Rights Reserved.
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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* =============================================================================
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*/
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import { datasetFromIteratorFn } from './dataset';
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import { CSVDataset } from './datasets/csv_dataset';
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import { iteratorFromFunction } from './iterators/lazy_iterator';
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import { MicrophoneIterator } from './iterators/microphone_iterator';
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import { WebcamIterator } from './iterators/webcam_iterator';
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import { URLDataSource } from './sources/url_data_source';
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/**
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* Create a `CSVDataset` by reading and decoding CSV file(s) from provided URL
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* or local path if it's in Node environment.
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*
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* Note: If isLabel in columnConfigs is `true` for at least one column, the
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* element in returned `CSVDataset` will be an object of
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* `{xs:features, ys:labels}`: xs is a dict of features key/value pairs, ys
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* is a dict of labels key/value pairs. If no column is marked as label,
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* returns a dict of features only.
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*
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* ```js
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* const csvUrl =
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* 'https://storage.googleapis.com/tfjs-examples/multivariate-linear-regression/data/boston-housing-train.csv';
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*
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* async function run() {
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* // We want to predict the column "medv", which represents a median value of
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* // a home (in $1000s), so we mark it as a label.
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* const csvDataset = tf.data.csv(
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* csvUrl, {
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* columnConfigs: {
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* medv: {
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* isLabel: true
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* }
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* }
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* });
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*
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* // Number of features is the number of column names minus one for the label
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* // column.
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* const numOfFeatures = (await csvDataset.columnNames()).length - 1;
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*
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* // Prepare the Dataset for training.
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* const flattenedDataset =
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* csvDataset
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* .map(({xs, ys}) =>
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* {
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* // Convert xs(features) and ys(labels) from object form (keyed by
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* // column name) to array form.
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* return {xs:Object.values(xs), ys:Object.values(ys)};
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* })
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* .batch(10);
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*
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* // Define the model.
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* const model = tf.sequential();
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* model.add(tf.layers.dense({
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* inputShape: [numOfFeatures],
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* units: 1
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* }));
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* model.compile({
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* optimizer: tf.train.sgd(0.000001),
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* loss: 'meanSquaredError'
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* });
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*
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* // Fit the model using the prepared Dataset
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* return model.fitDataset(flattenedDataset, {
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* epochs: 10,
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* callbacks: {
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* onEpochEnd: async (epoch, logs) => {
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* console.log(epoch + ':' + logs.loss);
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* }
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* }
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* });
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* }
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*
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* await run();
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* ```
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*
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* @param source URL or local path to get CSV file. If it's a local path, it
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* must have prefix `file://` and it only works in node environment.
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* @param csvConfig (Optional) A CSVConfig object that contains configurations
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* of reading and decoding from CSV file(s).
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*
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* @doc {
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* heading: 'Data',
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* subheading: 'Creation',
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* namespace: 'data',
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* configParamIndices: [1]
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* }
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*/
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export function csv(source, csvConfig = {}) {
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return new CSVDataset(new URLDataSource(source), csvConfig);
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}
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/**
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* Create a `Dataset` that produces each element by calling a provided function.
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*
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* Note that repeated iterations over this `Dataset` may produce different
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* results, because the function will be called anew for each element of each
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* iteration.
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*
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* Also, beware that the sequence of calls to this function may be out of order
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* in time with respect to the logical order of the Dataset. This is due to the
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* asynchronous lazy nature of stream processing, and depends on downstream
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* transformations (e.g. .shuffle()). If the provided function is pure, this is
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* no problem, but if it is a closure over a mutable state (e.g., a traversal
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* pointer), then the order of the produced elements may be scrambled.
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*
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* ```js
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* let i = -1;
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* const func = () =>
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* ++i < 5 ? {value: i, done: false} : {value: null, done: true};
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* const ds = tf.data.func(func);
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* await ds.forEachAsync(e => console.log(e));
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* ```
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*
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* @param f A function that produces one data element on each call.
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*/
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export function func(f) {
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const iter = iteratorFromFunction(f);
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return datasetFromIteratorFn(async () => iter);
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}
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/**
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* Create a `Dataset` that produces each element from provided JavaScript
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* generator, which is a function*
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* (https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Iterators_and_Generators#Generator_functions),
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* or a function that returns an
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* iterator
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* (https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Iterators_and_Generators#Generator_functions).
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*
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* The returned iterator should have `.next()` function that returns element in
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* format of `{value: TensorContainer, done:boolean}`.
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*
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* Example of creating a dataset from an iterator factory:
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* ```js
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* function makeIterator() {
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* const numElements = 10;
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* let index = 0;
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*
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* const iterator = {
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* next: () => {
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* let result;
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* if (index < numElements) {
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* result = {value: index, done: false};
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* index++;
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* return result;
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* }
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* return {value: index, done: true};
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* }
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* };
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* return iterator;
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* }
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* const ds = tf.data.generator(makeIterator);
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* await ds.forEachAsync(e => console.log(e));
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* ```
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*
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* Example of creating a dataset from a generator:
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* ```js
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* function* dataGenerator() {
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* const numElements = 10;
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* let index = 0;
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* while (index < numElements) {
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* const x = index;
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* index++;
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* yield x;
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* }
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* }
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*
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* const ds = tf.data.generator(dataGenerator);
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* await ds.forEachAsync(e => console.log(e));
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* ```
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*
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* @param generator A JavaScript generator function that returns a JavaScript
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* iterator.
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*
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* @doc {
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* heading: 'Data',
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* subheading: 'Creation',
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* namespace: 'data',
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* configParamIndices: [1]
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* }
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*/
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export function generator(generator) {
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return datasetFromIteratorFn(async () => {
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const gen = await generator();
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return iteratorFromFunction(() => gen.next());
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});
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}
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/**
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* Create an iterator that generates `Tensor`s from webcam video stream. This
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* API only works in Browser environment when the device has webcam.
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*
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* Note: this code snippet only works when the device has a webcam. It will
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* request permission to open the webcam when running.
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* ```js
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* const videoElement = document.createElement('video');
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* videoElement.width = 100;
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* videoElement.height = 100;
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* const cam = await tf.data.webcam(videoElement);
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* const img = await cam.capture();
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* img.print();
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* cam.stop();
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* ```
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*
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* @param webcamVideoElement A `HTMLVideoElement` used to play video from
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* webcam. If this element is not provided, a hidden `HTMLVideoElement` will
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* be created. In that case, `resizeWidth` and `resizeHeight` must be
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* provided to set the generated tensor shape.
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* @param webcamConfig A `WebcamConfig` object that contains configurations of
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* reading and manipulating data from webcam video stream.
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*
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* @doc {
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* heading: 'Data',
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* subheading: 'Creation',
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* namespace: 'data',
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* ignoreCI: true
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* }
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*/
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export async function webcam(webcamVideoElement, webcamConfig) {
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return WebcamIterator.create(webcamVideoElement, webcamConfig);
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}
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/**
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* Create an iterator that generates frequency-domain spectrogram `Tensor`s from
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* microphone audio stream with browser's native FFT. This API only works in
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* browser environment when the device has microphone.
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*
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* Note: this code snippet only works when the device has a microphone. It will
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* request permission to open the microphone when running.
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* ```js
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* const mic = await tf.data.microphone({
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* fftSize: 1024,
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* columnTruncateLength: 232,
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* numFramesPerSpectrogram: 43,
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* sampleRateHz:44100,
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* includeSpectrogram: true,
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* includeWaveform: true
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* });
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* const audioData = await mic.capture();
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* const spectrogramTensor = audioData.spectrogram;
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* spectrogramTensor.print();
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* const waveformTensor = audioData.waveform;
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* waveformTensor.print();
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* mic.stop();
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* ```
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*
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* @param microphoneConfig A `MicrophoneConfig` object that contains
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* configurations of reading audio data from microphone.
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*
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* @doc {
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* heading: 'Data',
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* subheading: 'Creation',
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* namespace: 'data',
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* ignoreCI: true
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* }
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*/
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export async function microphone(microphoneConfig) {
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return MicrophoneIterator.create(microphoneConfig);
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}
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//# sourceMappingURL=data:application/json;base64,{"version":3,"file":"readers.js","sourceRoot":"","sources":["../../../../../tfjs-data/src/readers.ts"],"names":[],"mappings":"AAAA;;;;;;;;;;;;;;;;GAgBG;AAGH,OAAO,EAAU,qBAAqB,EAAC,MAAM,WAAW,CAAC;AACzD,OAAO,EAAC,UAAU,EAAC,MAAM,wBAAwB,CAAC;AAClD,OAAO,EAAC,oBAAoB,EAAC,MAAM,2BAA2B,CAAC;AAC/D,OAAO,EAAC,kBAAkB,EAAC,MAAM,iCAAiC,CAAC;AACnE,OAAO,EAAC,cAAc,EAAC,MAAM,6BAA6B,CAAC;AAC3D,OAAO,EAAC,aAAa,EAAC,MAAM,2BAA2B,CAAC;AAGxD;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;GA6EG;AACH,MAAM,UAAU,GAAG,CACf,MAAmB,EAAE,YAAuB,EAAE;IAChD,OAAO,IAAI,UAAU,CAAC,IAAI,aAAa,CAAC,MAAM,CAAC,EAAE,SAAS,CAAC,CAAC;AAC9D,CAAC;AAED;;;;;;;;;;;;;;;;;;;;;;;GAuBG;AACH,MAAM,UAAU,IAAI,CAChB,CAAsD;IACxD,MAAM,IAAI,GAAG,oBAAoB,CAAC,CAAC,CAAC,CAAC;IACrC,OAAO,qBAAqB,CAAC,KAAK,IAAI,EAAE,CAAC,IAAI,CAAC,CAAC;AACjD,CAAC;AAED;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;GA2DG;AACH,MAAM,UAAU,SAAS,CACrB,SAAkD;IACpD,OAAO,qBAAqB,CAAC,KAAK,IAAI,EAAE;QACtC,MAAM,GAAG,GAAG,MAAM,SAAS,EAAE,CAAC;QAC9B,OAAO,oBAAoB,CAAC,GAAG,EAAE,CAAC,GAAG,CAAC,IAAI,EAAE,CAAC,CAAC;IAChD,CAAC,CAAC,CAAC;AACL,CAAC;AAED;;;;;;;;;;;;;;;;;;;;;;;;;;;;;GA6BG;AACH,MAAM,CAAC,KAAK,UAAU,MAAM,CACxB,kBAAqC,EACrC,YAA2B;IAC7B,OAAO,cAAc,CAAC,MAAM,CAAC,kBAAkB,EAAE,YAAY,CAAC,CAAC;AACjE,CAAC;AAED;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;GAiCG;AACH,MAAM,CAAC,KAAK,UAAU,UAAU,CAAC,gBAAmC;IAElE,OAAO,kBAAkB,CAAC,MAAM,CAAC,gBAAgB,CAAC,CAAC;AACrD,CAAC","sourcesContent":["/**\n * @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 {TensorContainer} from '@tensorflow/tfjs-core';\nimport {Dataset, datasetFromIteratorFn} from './dataset';\nimport {CSVDataset} from './datasets/csv_dataset';\nimport {iteratorFromFunction} from './iterators/lazy_iterator';\nimport {MicrophoneIterator} from './iterators/microphone_iterator';\nimport {WebcamIterator} from './iterators/webcam_iterator';\nimport {URLDataSource} from './sources/url_data_source';\nimport {CSVConfig, MicrophoneConfig, WebcamConfig} from './types';\n\n/**\n * Create a `CSVDataset` by reading and decoding CSV file(s) from provided URL\n * or local path if it's in Node environment.\n *\n * Note: If isLabel in columnConfigs is `true` for at least one column, the\n * element in returned `CSVDataset` will be an object of\n * `{xs:features, ys:labels}`: xs is a dict of features key/value pairs, ys\n * is a dict of labels key/value pairs. If no column is marked as label,\n * returns a dict of features only.\n *\n * ```js\n * const csvUrl =\n * 'https://storage.googleapis.com/tfjs-examples/multivariate-linear-regression/data/boston-housing-train.csv';\n *\n * async function run() {\n *   // We want to predict the column \"medv\", which represents a median value of\n *   // a home (in $1000s), so we mark it as a label.\n *   const csvDataset = tf.data.csv(\n *     csvUrl, {\n *       columnConfigs: {\n *         medv: {\n *           isLabel: true\n *         }\n *       }\n *     });\n *\n *   // Number of features is the number of column names minus one for the label\n *   // column.\n *   const numOfFeatures = (await csvDataset.columnNames()).length - 1;\n *\n *   // Prepare the Dataset for training.\n *   const flattenedDataset =\n *     csvDataset\n *     .map(({xs, ys}) =>\n *       {\n *         // Convert xs(features) and ys(labels) from object form (keyed by\n *         // column name) to array form.\n *         return {xs:Object.values(xs), ys:Object.values(ys)};\n *       })\n *     .batch(10);\n *\n *   // Define the model.\n *   const model = tf.sequential();\n *   model.add(tf.layers.dense({\n *     inputShape: [numOfFeatures],\n *     units: 1\n *   }));\n *   model.compile({\n *     optimizer: tf.train.sgd(0.000001),\n *     loss: 'meanSquaredError'\n *   });\n *\n *   // Fit the model using the prepared Dataset\n *   return model.fitDataset(flattenedDataset, {\n *     epochs: 10,\n *     callbacks: {\n *       onEpochEnd: async (epoch, logs) => {\n *         console.log(epoch + ':' + logs.loss);\n *       }\n *     }\n *   });\n * }\n *\n * await run();\n * ```\n *\n * @param source URL or local path to get CSV file. If it's a local path, it\n * must have prefix `file://` and it only works in node environment.\n * @param csvConfig (Optional) A CSVConfig object that contains configurations\n *     of reading and decoding from CSV file(s).\n *\n * @doc {\n *   heading: 'Data',\n *   subheading: 'Creation',\n *   namespace: 'data',\n *   configParamIndices: [1]\n *  }\n */\nexport function csv(\n    source: RequestInfo, csvConfig: CSVConfig = {}): CSVDataset {\n  return new CSVDataset(new URLDataSource(source), csvConfig);\n}\n\n/**\n * Create a `Dataset` that produces each element by calling a provided function.\n *\n * Note that repeated iterations over this `Dataset` may produce different\n * results, because the function will be called anew for each element of each\n * iteration.\n *\n * Also, beware that the sequence of calls to this function may be out of order\n * in time with respect to the logical order of the Dataset. This is due to the\n * asynchronous lazy nature of stream processing, and depends on downstream\n * transformations (e.g. .shuffle()). If the provided function is pure, this is\n * no problem, but if it is a closure over a mutable state (e.g., a traversal\n * pointer), then the order of the produced elements may be scrambled.\n *\n * ```js\n * let i = -1;\n * const func = () =>\n *    ++i < 5 ? {value: i, done: false} : {value: null, done: true};\n * const ds = tf.data.func(func);\n * await ds.forEachAsync(e => console.log(e));\n * ```\n *\n * @param f A function that produces one data element on each call.\n */\nexport function func<T extends TensorContainer>(\n    f: () => IteratorResult<T>| Promise<IteratorResult<T>>): Dataset<T> {\n  const iter = iteratorFromFunction(f);\n  return datasetFromIteratorFn(async () => iter);\n}\n\n/**\n * Create a `Dataset` that produces each element from provided JavaScript\n * generator, which is a function*\n * (https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Iterators_and_Generators#Generator_functions),\n * or a function that returns an\n * iterator\n * (https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Iterators_and_Generators#Generator_functions).\n *\n * The returned iterator should have `.next()` function that returns element in\n * format of `{value: TensorContainer, done:boolean}`.\n *\n * Example of creating a dataset from an iterator factory:\n * ```js\n * function makeIterator() {\n *   const numElements = 10;\n *   let index = 0;\n *\n *   const iterator = {\n *     next: () => {\n *       let result;\n *       if (index < numElements) {\n *         result = {value: index, done: false};\n *         index++;\n *         return result;\n *       }\n *       return {value: index, done: true};\n *     }\n *   };\n *   return iterator;\n * }\n * const ds = tf.data.generator(makeIterator);\n * await ds.forEachAsync(e => console.log(e));\n * ```\n *\n * Example of creating a dataset from a generator:\n * ```js\n * function* dataGenerator() {\n *   const numElements = 10;\n *   let index = 0;\n *   while (index < numElements) {\n *     const x = index;\n *     index++;\n *     yield x;\n *   }\n * }\n *\n * const ds = tf.data.generator(dataGenerator);\n * await ds.forEachAsync(e => console.log(e));\n * ```\n *\n * @param generator A JavaScript generator function that returns a JavaScript\n *     iterator.\n *\n * @doc {\n *   heading: 'Data',\n *   subheading: 'Creation',\n *   namespace: 'data',\n *   configParamIndices: [1]\n *  }\n */\nexport function generator<T extends TensorContainer>(\n    generator: () => Iterator<T>| Promise<Iterator<T>>): Dataset<T> {\n  return datasetFromIteratorFn(async () => {\n    const gen = await generator();\n    return iteratorFromFunction(() => gen.next());\n  });\n}\n\n/**\n * Create an iterator that generates `Tensor`s from webcam video stream. This\n * API only works in Browser environment when the device has webcam.\n *\n * Note: this code snippet only works when the device has a webcam. It will\n * request permission to open the webcam when running.\n * ```js\n * const videoElement = document.createElement('video');\n * videoElement.width = 100;\n * videoElement.height = 100;\n * const cam = await tf.data.webcam(videoElement);\n * const img = await cam.capture();\n * img.print();\n * cam.stop();\n * ```\n *\n * @param webcamVideoElement A `HTMLVideoElement` used to play video from\n *     webcam. If this element is not provided, a hidden `HTMLVideoElement` will\n *     be created. In that case, `resizeWidth` and `resizeHeight` must be\n *     provided to set the generated tensor shape.\n * @param webcamConfig A `WebcamConfig` object that contains configurations of\n *     reading and manipulating data from webcam video stream.\n *\n * @doc {\n *   heading: 'Data',\n *   subheading: 'Creation',\n *   namespace: 'data',\n *   ignoreCI: true\n *  }\n */\nexport async function webcam(\n    webcamVideoElement?: HTMLVideoElement,\n    webcamConfig?: WebcamConfig): Promise<WebcamIterator> {\n  return WebcamIterator.create(webcamVideoElement, webcamConfig);\n}\n\n/**\n * Create an iterator that generates frequency-domain spectrogram `Tensor`s from\n * microphone audio stream with browser's native FFT. This API only works in\n * browser environment when the device has microphone.\n *\n * Note: this code snippet only works when the device has a microphone. It will\n * request permission to open the microphone when running.\n * ```js\n * const mic = await tf.data.microphone({\n *   fftSize: 1024,\n *   columnTruncateLength: 232,\n *   numFramesPerSpectrogram: 43,\n *   sampleRateHz:44100,\n *   includeSpectrogram: true,\n *   includeWaveform: true\n * });\n * const audioData = await mic.capture();\n * const spectrogramTensor = audioData.spectrogram;\n * spectrogramTensor.print();\n * const waveformTensor = audioData.waveform;\n * waveformTensor.print();\n * mic.stop();\n * ```\n *\n * @param microphoneConfig A `MicrophoneConfig` object that contains\n *     configurations of reading audio data from microphone.\n *\n * @doc {\n *   heading: 'Data',\n *   subheading: 'Creation',\n *   namespace: 'data',\n *   ignoreCI: true\n *  }\n */\nexport async function microphone(microphoneConfig?: MicrophoneConfig):\n    Promise<MicrophoneIterator> {\n  return MicrophoneIterator.create(microphoneConfig);\n}\n"]}
|