| 1 | /**
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| 2 | * @license
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| 3 | * Copyright 2017 Google LLC. All Rights Reserved.
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| 4 | * Licensed under the Apache License, Version 2.0 (the "License");
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| 5 | * you may not use this file except in compliance with the License.
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| 6 | * You may obtain a copy of the License at
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| 7 | *
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| 8 | * http://www.apache.org/licenses/LICENSE-2.0
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| 9 | *
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| 10 | * Unless required by applicable law or agreed to in writing, software
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| 11 | * distributed under the License is distributed on an "AS IS" BASIS,
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| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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| 13 | * See the License for the specific language governing permissions and
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| 14 | * limitations under the License.
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| 15 | * =============================================================================
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| 16 | */
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| 17 | import { env } from './environment';
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| 18 | import * as base from './util_base';
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| 19 | export * from './util_base';
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| 20 | export * from './hash_util';
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| 21 | /**
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| 22 | * Create typed array for scalar value. Used for storing in `DataStorage`.
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| 23 | */
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| 24 | export function createScalarValue(value, dtype) {
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| 25 | if (dtype === 'string') {
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| 26 | return encodeString(value);
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| 27 | }
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| 28 | return toTypedArray([value], dtype);
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| 29 | }
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| 30 | function noConversionNeeded(a, dtype) {
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| 31 | return (a instanceof Float32Array && dtype === 'float32') ||
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| 32 | (a instanceof Int32Array && dtype === 'int32') ||
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| 33 | (a instanceof Uint8Array && dtype === 'bool');
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| 34 | }
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| 35 | export function toTypedArray(a, dtype) {
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| 36 | if (dtype === 'string') {
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| 37 | throw new Error('Cannot convert a string[] to a TypedArray');
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| 38 | }
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| 39 | if (Array.isArray(a)) {
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| 40 | a = base.flatten(a);
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| 41 | }
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| 42 | if (env().getBool('DEBUG')) {
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| 43 | base.checkConversionForErrors(a, dtype);
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| 44 | }
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| 45 | if (noConversionNeeded(a, dtype)) {
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| 46 | return a;
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| 47 | }
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| 48 | if (dtype == null || dtype === 'float32' || dtype === 'complex64') {
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| 49 | return new Float32Array(a);
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| 50 | }
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| 51 | else if (dtype === 'int32') {
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| 52 | return new Int32Array(a);
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| 53 | }
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| 54 | else if (dtype === 'bool') {
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| 55 | const bool = new Uint8Array(a.length);
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| 56 | for (let i = 0; i < bool.length; ++i) {
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| 57 | if (Math.round(a[i]) !== 0) {
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| 58 | bool[i] = 1;
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| 59 | }
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| 60 | }
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| 61 | return bool;
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| 62 | }
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| 63 | else {
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| 64 | throw new Error(`Unknown data type ${dtype}`);
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| 65 | }
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| 66 | }
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| 67 | /**
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| 68 | * Returns the current high-resolution time in milliseconds relative to an
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| 69 | * arbitrary time in the past. It works across different platforms (node.js,
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| 70 | * browsers).
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| 71 | *
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| 72 | * ```js
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| 73 | * console.log(tf.util.now());
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| 74 | * ```
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| 75 | *
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| 76 | * @doc {heading: 'Util', namespace: 'util'}
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| 77 | */
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| 78 | export function now() {
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| 79 | return env().platform.now();
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| 80 | }
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| 81 | /**
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| 82 | * Returns a platform-specific implementation of
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| 83 | * [`fetch`](https://developer.mozilla.org/en-US/docs/Web/API/Fetch_API).
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| 84 | *
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| 85 | * If `fetch` is defined on the global object (`window`, `process`, etc.),
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| 86 | * `tf.util.fetch` returns that function.
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| 87 | *
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| 88 | * If not, `tf.util.fetch` returns a platform-specific solution.
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| 89 | *
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| 90 | * ```js
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| 91 | * const resource = await tf.util.fetch('https://unpkg.com/@tensorflow/tfjs');
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| 92 | * // handle response
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| 93 | * ```
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| 94 | *
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| 95 | * @doc {heading: 'Util'}
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| 96 | */
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| 97 | export function fetch(path, requestInits) {
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| 98 | return env().platform.fetch(path, requestInits);
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| 99 | }
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| 100 | /**
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| 101 | * Encodes the provided string into bytes using the provided encoding scheme.
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| 102 | *
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| 103 | * @param s The string to encode.
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| 104 | * @param encoding The encoding scheme. Defaults to utf-8.
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| 105 | *
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| 106 | * @doc {heading: 'Util'}
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| 107 | */
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| 108 | export function encodeString(s, encoding = 'utf-8') {
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| 109 | encoding = encoding || 'utf-8';
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| 110 | return env().platform.encode(s, encoding);
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| 111 | }
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| 112 | /**
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| 113 | * Decodes the provided bytes into a string using the provided encoding scheme.
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| 114 | * @param bytes The bytes to decode.
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| 115 | *
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| 116 | * @param encoding The encoding scheme. Defaults to utf-8.
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| 117 | *
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| 118 | * @doc {heading: 'Util'}
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| 119 | */
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| 120 | export function decodeString(bytes, encoding = 'utf-8') {
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| 121 | encoding = encoding || 'utf-8';
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| 122 | return env().platform.decode(bytes, encoding);
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| 123 | }
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| 124 | //# sourceMappingURL=util.js.map |
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