/**
 * @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 { env } from '../environment';
import * as util from '../util';
import { CompositeArrayBuffer } from './composite_array_buffer';
import { decodeWeights } from './io_utils';
import { monitorPromisesProgress } from './progress';
import { DTYPE_VALUE_SIZE_MAP } from './types';
/**
 * Reads binary weights data from a number of URLs.
 *
 * @param fetchURLs URLs to send the HTTP requests at, using `fetch` calls.
 * @param requestOptions RequestInit (options) for the HTTP requests.
 * @param fetchFunc Optional overriding value for the `window.fetch` function.
 * @param onProgress Optional, progress callback function, fired periodically
 *   before the load is completed.
 * @returns A `Promise` of an Array of `ArrayBuffer`. The Array has the same
 *   length as `fetchURLs`.
 */
export async function loadWeightsAsArrayBuffer(fetchURLs, loadOptions) {
    if (loadOptions == null) {
        loadOptions = {};
    }
    const fetchFunc = loadOptions.fetchFunc == null ? env().platform.fetch :
        loadOptions.fetchFunc;
    // Create the requests for all of the weights in parallel.
    const requests = fetchURLs.map(fetchURL => fetchFunc(fetchURL, loadOptions.requestInit, { isBinary: true }));
    const fetchStartFraction = 0;
    const fetchEndFraction = 0.5;
    const responses = loadOptions.onProgress == null ?
        await Promise.all(requests) :
        await monitorPromisesProgress(requests, loadOptions.onProgress, fetchStartFraction, fetchEndFraction);
    const bufferPromises = responses.map(response => response.arrayBuffer());
    const bufferStartFraction = 0.5;
    const bufferEndFraction = 1;
    const buffers = loadOptions.onProgress == null ?
        await Promise.all(bufferPromises) :
        await monitorPromisesProgress(bufferPromises, loadOptions.onProgress, bufferStartFraction, bufferEndFraction);
    return buffers;
}
export function streamWeights(fetchURLs, loadOptions) {
    var _a;
    const fetchFunc = loadOptions.fetchFunc == null ? env().platform.fetch :
        loadOptions.fetchFunc;
    let fetchIndex = 0;
    let chunkReader;
    (_a = loadOptions.onProgress) === null || _a === void 0 ? void 0 : _a.call(loadOptions, 0);
    return new ReadableStream({
        pull: async (controller) => {
            var _a;
            while (fetchIndex < fetchURLs.length) {
                if (!chunkReader) {
                    const body = (await fetchFunc(fetchURLs[fetchIndex], loadOptions.requestInit, { isBinary: true })).body;
                    chunkReader = body.getReader();
                }
                const { done, value } = await chunkReader.read();
                if (done) {
                    fetchIndex++;
                    chunkReader = undefined;
                    (_a = loadOptions.onProgress) === null || _a === void 0 ? void 0 : _a.call(loadOptions, fetchIndex / fetchURLs.length);
                    continue;
                }
                controller.enqueue(value);
                return;
            }
            controller.close();
        },
    });
}
/**
 * Reads a weights manifest JSON configuration, fetches the weights and
 * returns them as `Tensor`s.
 *
 * @param manifest The weights manifest JSON.
 * @param filePathPrefix The path prefix for filenames given in the manifest.
 *     Defaults to the empty string.
 * @param weightNames The names of the weights to be fetched.
 */
export async function loadWeights(manifest, filePathPrefix = '', weightNames, requestInit) {
    // TODO(nsthorat): Groups are currently fetched atomically. If you need a
    // single weight from a group, the whole group will be fetched. At a future
    // date, we should support fetching only the individual shards within a
    // group that are needed to reconstruct the requested weight.
    // TODO(cais): Use `decodeWeights` for implementation.
    const fetchWeights = (fetchUrls) => loadWeightsAsArrayBuffer(fetchUrls, { requestInit });
    const loadWeights = weightsLoaderFactory(fetchWeights);
    return loadWeights(manifest, filePathPrefix, weightNames);
}
/**
 * Creates a function, which reads a weights manifest JSON configuration,
 * fetches the weight files using the specified function and returns them as
 * `Tensor`s.
 *
 * ```js
 * // example for creating a nodejs weight loader, which reads the weight files
 * // from disk using fs.readFileSync
 *
 * import * as fs from 'fs'
 *
 * const fetchWeightsFromDisk = (filePaths: string[]) =>
 *   filePaths.map(filePath => fs.readFileSync(filePath).buffer)
 *
 * const loadWeights = tf.io.weightsLoaderFactory(fetchWeightsFromDisk)
 *
 * const manifest = JSON.parse(
 *   fs.readFileSync('./my_model-weights_manifest').toString()
 * )
 * const weightMap = await loadWeights(manifest, './')
 * ```
 * @param fetchWeightsFunction The function used for fetching the weight files.
 * @returns Weight loading function.
 */
export function weightsLoaderFactory(fetchWeightsFunction) {
    return async (manifest, filePathPrefix = '', weightNames) => {
        // Collect all the groups, weights, and their relative offsets to be
        // fetched.
        const groupIndicesToFetchMap = manifest.map(() => false);
        const groupWeightsToFetch = {};
        const weightsFound = weightNames != null ? weightNames.map(() => false) : [];
        const allManifestWeightNames = [];
        manifest.forEach((manifestGroupConfig, groupIndex) => {
            let groupOffset = 0;
            manifestGroupConfig.weights.forEach(weightsEntry => {
                const rawDtype = ('quantization' in weightsEntry) ?
                    weightsEntry.quantization.dtype :
                    weightsEntry.dtype;
                const weightsBytes = DTYPE_VALUE_SIZE_MAP[rawDtype] *
                    util.sizeFromShape(weightsEntry.shape);
                const enqueueWeightsForFetchingFn = () => {
                    groupIndicesToFetchMap[groupIndex] = true;
                    if (groupWeightsToFetch[groupIndex] == null) {
                        groupWeightsToFetch[groupIndex] = [];
                    }
                    groupWeightsToFetch[groupIndex].push({
                        manifestEntry: weightsEntry,
                        groupOffset,
                        sizeBytes: weightsBytes
                    });
                };
                if (weightNames != null) {
                    weightNames.forEach((weightName, weightIndex) => {
                        if (weightName === weightsEntry.name) {
                            enqueueWeightsForFetchingFn();
                            weightsFound[weightIndex] = true;
                        }
                    });
                }
                else {
                    enqueueWeightsForFetchingFn();
                }
                allManifestWeightNames.push(weightsEntry.name);
                groupOffset += weightsBytes;
            });
        });
        if (!weightsFound.every(found => found)) {
            const weightsNotFound = weightNames.filter((_, i) => !weightsFound[i]);
            throw new Error(`Could not find weights in manifest with names: ` +
                `${weightsNotFound.join(', ')}. \n` +
                `Manifest JSON has weights with names: ` +
                `${allManifestWeightNames.join(', ')}.`);
        }
        // Convert the one-hot boolean groupId => shouldFetch map to a list of group
        // IDs.
        const groupIndicesToFetch = groupIndicesToFetchMap.reduce((accumulator, shouldFetch, i) => {
            if (shouldFetch) {
                accumulator.push(i);
            }
            return accumulator;
        }, []);
        const fetchUrls = [];
        groupIndicesToFetch.forEach(i => {
            manifest[i].paths.forEach(filepath => {
                const fetchUrl = filePathPrefix +
                    (!filePathPrefix.endsWith('/') ? '/' : '') + filepath;
                fetchUrls.push(fetchUrl);
            });
        });
        const buffers = await fetchWeightsFunction(fetchUrls);
        const weightsTensorMap = {};
        let bufferIndexOffset = 0;
        groupIndicesToFetch.forEach(i => {
            const numBuffers = manifest[i].paths.length;
            const weightsBuffer = new CompositeArrayBuffer(buffers.slice(bufferIndexOffset, bufferIndexOffset + numBuffers));
            const weightsEntries = groupWeightsToFetch[i];
            weightsEntries.forEach(weightsEntry => {
                const byteBuffer = weightsBuffer.slice(weightsEntry.groupOffset, weightsEntry.groupOffset + weightsEntry.sizeBytes);
                const nameToTensorMap = decodeWeights(byteBuffer, [weightsEntry.manifestEntry]);
                for (const name in nameToTensorMap) {
                    weightsTensorMap[name] = nameToTensorMap[name];
                }
            });
            bufferIndexOffset += numBuffers;
        });
        return weightsTensorMap;
    };
}
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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\nimport {env} from '../environment';\n\nimport {NamedTensorMap} from '../tensor_types';\nimport * as util from '../util';\nimport {CompositeArrayBuffer} from './composite_array_buffer';\nimport {decodeWeights} from './io_utils';\nimport {monitorPromisesProgress} from './progress';\nimport {DTYPE_VALUE_SIZE_MAP, LoadOptions, WeightsManifestConfig, WeightsManifestEntry} from './types';\n\n/**\n * Reads binary weights data from a number of URLs.\n *\n * @param fetchURLs URLs to send the HTTP requests at, using `fetch` calls.\n * @param requestOptions RequestInit (options) for the HTTP requests.\n * @param fetchFunc Optional overriding value for the `window.fetch` function.\n * @param onProgress Optional, progress callback function, fired periodically\n *   before the load is completed.\n * @returns A `Promise` of an Array of `ArrayBuffer`. The Array has the same\n *   length as `fetchURLs`.\n */\nexport async function loadWeightsAsArrayBuffer(\n  fetchURLs: string[], loadOptions?: LoadOptions): Promise<ArrayBuffer[]> {\n  if (loadOptions == null) {\n    loadOptions = {};\n  }\n\n  const fetchFunc = loadOptions.fetchFunc == null ? env().platform.fetch :\n    loadOptions.fetchFunc;\n\n  // Create the requests for all of the weights in parallel.\n  const requests = fetchURLs.map(\n    fetchURL =>\n      fetchFunc(fetchURL, loadOptions.requestInit, { isBinary: true }));\n\n  const fetchStartFraction = 0;\n  const fetchEndFraction = 0.5;\n\n  const responses = loadOptions.onProgress == null ?\n    await Promise.all(requests) :\n    await monitorPromisesProgress(\n      requests, loadOptions.onProgress, fetchStartFraction,\n      fetchEndFraction);\n\n  const bufferPromises = responses.map(response => response.arrayBuffer());\n\n  const bufferStartFraction = 0.5;\n  const bufferEndFraction = 1;\n\n  const buffers = loadOptions.onProgress == null ?\n    await Promise.all(bufferPromises) :\n    await monitorPromisesProgress(\n      bufferPromises, loadOptions.onProgress, bufferStartFraction,\n      bufferEndFraction);\n  return buffers;\n}\n\nexport function streamWeights(fetchURLs: string[], loadOptions: LoadOptions): ReadableStream<ArrayBuffer> {\n  const fetchFunc = loadOptions.fetchFunc == null ? env().platform.fetch :\n    loadOptions.fetchFunc;\n\n  let fetchIndex = 0;\n  let chunkReader: ReadableStreamDefaultReader<Uint8Array> | undefined;\n  loadOptions.onProgress?.(0);\n  return new ReadableStream<Uint8Array>({\n    pull: async (controller) => {\n      while (fetchIndex < fetchURLs.length) {\n        if (!chunkReader) {\n          const body = (await fetchFunc(fetchURLs[fetchIndex],\n                                         loadOptions.requestInit,\n                                         {isBinary: true})).body;\n\n          chunkReader = body.getReader();\n        }\n\n        const {done, value} = await chunkReader.read();\n\n        if (done) {\n          fetchIndex++;\n          chunkReader = undefined;\n          loadOptions.onProgress?.(fetchIndex / fetchURLs.length);\n          continue;\n        }\n        controller.enqueue(value);\n        return;\n      }\n      controller.close();\n    },\n  });\n}\n\n/**\n * Reads a weights manifest JSON configuration, fetches the weights and\n * returns them as `Tensor`s.\n *\n * @param manifest The weights manifest JSON.\n * @param filePathPrefix The path prefix for filenames given in the manifest.\n *     Defaults to the empty string.\n * @param weightNames The names of the weights to be fetched.\n */\nexport async function loadWeights(\n  manifest: WeightsManifestConfig, filePathPrefix = '',\n  weightNames?: string[],\n  requestInit?: RequestInit): Promise<NamedTensorMap> {\n  // TODO(nsthorat): Groups are currently fetched atomically. If you need a\n  // single weight from a group, the whole group will be fetched. At a future\n  // date, we should support fetching only the individual shards within a\n  // group that are needed to reconstruct the requested weight.\n  // TODO(cais): Use `decodeWeights` for implementation.\n\n  const fetchWeights = (fetchUrls: string[]) =>\n    loadWeightsAsArrayBuffer(fetchUrls, { requestInit });\n  const loadWeights = weightsLoaderFactory(fetchWeights);\n\n  return loadWeights(manifest, filePathPrefix, weightNames);\n}\n\n/**\n * Creates a function, which reads a weights manifest JSON configuration,\n * fetches the weight files using the specified function and returns them as\n * `Tensor`s.\n *\n * ```js\n * // example for creating a nodejs weight loader, which reads the weight files\n * // from disk using fs.readFileSync\n *\n * import * as fs from 'fs'\n *\n * const fetchWeightsFromDisk = (filePaths: string[]) =>\n *   filePaths.map(filePath => fs.readFileSync(filePath).buffer)\n *\n * const loadWeights = tf.io.weightsLoaderFactory(fetchWeightsFromDisk)\n *\n * const manifest = JSON.parse(\n *   fs.readFileSync('./my_model-weights_manifest').toString()\n * )\n * const weightMap = await loadWeights(manifest, './')\n * ```\n * @param fetchWeightsFunction The function used for fetching the weight files.\n * @returns Weight loading function.\n */\nexport function weightsLoaderFactory(\n  fetchWeightsFunction: (fetchUrls: string[]) => Promise<ArrayBuffer[]>):\n  (manifest: WeightsManifestConfig, filePathPrefix?: string,\n    weightNames?: string[]) => Promise<NamedTensorMap> {\n  return async (\n    manifest: WeightsManifestConfig, filePathPrefix = '',\n    weightNames?: string[]): Promise<NamedTensorMap> => {\n    // Collect all the groups, weights, and their relative offsets to be\n    // fetched.\n    const groupIndicesToFetchMap = manifest.map(() => false);\n    const groupWeightsToFetch: {\n      [group: number]: Array<{\n        manifestEntry: WeightsManifestEntry; groupOffset: number;\n        sizeBytes: number;\n      }>\n    } = {};\n    const weightsFound =\n      weightNames != null ? weightNames.map(() => false) : [];\n    const allManifestWeightNames: string[] = [];\n    manifest.forEach((manifestGroupConfig, groupIndex) => {\n      let groupOffset = 0;\n      manifestGroupConfig.weights.forEach(weightsEntry => {\n        const rawDtype = ('quantization' in weightsEntry) ?\n          weightsEntry.quantization.dtype :\n          weightsEntry.dtype;\n\n        const weightsBytes = DTYPE_VALUE_SIZE_MAP[rawDtype] *\n          util.sizeFromShape(weightsEntry.shape);\n\n        const enqueueWeightsForFetchingFn = () => {\n          groupIndicesToFetchMap[groupIndex] = true;\n          if (groupWeightsToFetch[groupIndex] == null) {\n            groupWeightsToFetch[groupIndex] = [];\n          }\n\n          groupWeightsToFetch[groupIndex].push({\n            manifestEntry: weightsEntry,\n            groupOffset,\n            sizeBytes: weightsBytes\n          });\n        };\n\n        if (weightNames != null) {\n          weightNames.forEach((weightName, weightIndex) => {\n            if (weightName === weightsEntry.name) {\n              enqueueWeightsForFetchingFn();\n              weightsFound[weightIndex] = true;\n            }\n          });\n        } else {\n          enqueueWeightsForFetchingFn();\n        }\n\n        allManifestWeightNames.push(weightsEntry.name);\n        groupOffset += weightsBytes;\n      });\n    });\n\n    if (!weightsFound.every(found => found)) {\n      const weightsNotFound = weightNames.filter((_, i) => !weightsFound[i]);\n      throw new Error(\n        `Could not find weights in manifest with names: ` +\n        `${weightsNotFound.join(', ')}. \\n` +\n        `Manifest JSON has weights with names: ` +\n        `${allManifestWeightNames.join(', ')}.`);\n    }\n\n    // Convert the one-hot boolean groupId => shouldFetch map to a list of group\n    // IDs.\n    const groupIndicesToFetch =\n      groupIndicesToFetchMap.reduce((accumulator, shouldFetch, i) => {\n        if (shouldFetch) {\n          accumulator.push(i);\n        }\n        return accumulator;\n      }, []);\n\n    const fetchUrls: string[] = [];\n    groupIndicesToFetch.forEach(i => {\n      manifest[i].paths.forEach(filepath => {\n        const fetchUrl = filePathPrefix +\n          (!filePathPrefix.endsWith('/') ? '/' : '') + filepath;\n        fetchUrls.push(fetchUrl);\n      });\n    });\n    const buffers = await fetchWeightsFunction(fetchUrls);\n\n    const weightsTensorMap: NamedTensorMap = {};\n    let bufferIndexOffset = 0;\n    groupIndicesToFetch.forEach(i => {\n      const numBuffers = manifest[i].paths.length;\n\n      const weightsBuffer = new CompositeArrayBuffer(\n        buffers.slice(bufferIndexOffset, bufferIndexOffset + numBuffers));\n\n      const weightsEntries = groupWeightsToFetch[i];\n\n      weightsEntries.forEach(weightsEntry => {\n        const byteBuffer = weightsBuffer.slice(\n          weightsEntry.groupOffset,\n          weightsEntry.groupOffset + weightsEntry.sizeBytes);\n        const nameToTensorMap =\n          decodeWeights(byteBuffer, [weightsEntry.manifestEntry]);\n        for (const name in nameToTensorMap) {\n          weightsTensorMap[name] = nameToTensorMap[name];\n        }\n      });\n\n      bufferIndexOffset += numBuffers;\n    });\n\n    return weightsTensorMap;\n  };\n}\n"]}