/**
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* @license
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* Copyright 2017 Google Inc. 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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import { DataType, DataTypeMap, FlatVector, NumericDataType, RecursiveArray, TensorLike, TypedArray } from './types';
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/**
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* Shuffles the array in-place using Fisher-Yates algorithm.
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*
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* ```js
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* const a = [1, 2, 3, 4, 5];
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* tf.util.shuffle(a);
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* console.log(a);
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* ```
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*
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* @param array The array to shuffle in-place.
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*/
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/** @doc {heading: 'Util', namespace: 'util'} */
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export declare function shuffle(array: any[] | Uint32Array | Int32Array | Float32Array): void;
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/** Clamps a value to a specified range. */
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export declare function clamp(min: number, x: number, max: number): number;
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export declare function nearestLargerEven(val: number): number;
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export declare function sum(arr: number[]): number;
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/**
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* Returns a sample from a uniform [a, b) distribution.
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*
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* @param a The minimum support (inclusive).
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* @param b The maximum support (exclusive).
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* @return A pseudorandom number on the half-open interval [a,b).
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*/
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export declare function randUniform(a: number, b: number): number;
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/** Returns the squared Euclidean distance between two vectors. */
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export declare function distSquared(a: FlatVector, b: FlatVector): number;
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/**
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* Asserts that the expression is true. Otherwise throws an error with the
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* provided message.
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*
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* ```js
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* const x = 2;
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* tf.util.assert(x === 2, 'x is not 2');
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* ```
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*
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* @param expr The expression to assert (as a boolean).
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* @param msg A function that returns the message to report when throwing an
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* error. We use a function for performance reasons.
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*/
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/** @doc {heading: 'Util', namespace: 'util'} */
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export declare function assert(expr: boolean, msg: () => string): void;
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export declare function assertShapesMatch(shapeA: number[], shapeB: number[], errorMessagePrefix?: string): void;
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export declare function assertNonNull(a: TensorLike): void;
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/**
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* Flattens an arbitrarily nested array.
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*
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* ```js
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* const a = [[1, 2], [3, 4], [5, [6, [7]]]];
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* const flat = tf.util.flatten(a);
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* console.log(flat);
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* ```
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*
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* @param arr The nested array to flatten.
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* @param result The destination array which holds the elements.
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* @param skipTypedArray If true, avoids flattening the typed arrays. Defaults
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* to false.
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*/
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/** @doc {heading: 'Util', namespace: 'util'} */
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export declare function flatten<T extends number | boolean | string | Promise<number> | TypedArray>(arr: T | RecursiveArray<T>, result?: T[], skipTypedArray?: boolean): T[];
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/**
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* Returns the size (number of elements) of the tensor given its shape.
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*
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* ```js
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* const shape = [3, 4, 2];
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* const size = tf.util.sizeFromShape(shape);
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* console.log(size);
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* ```
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*/
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/** @doc {heading: 'Util', namespace: 'util'} */
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export declare function sizeFromShape(shape: number[]): number;
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export declare function isScalarShape(shape: number[]): boolean;
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export declare function arraysEqual(n1: FlatVector, n2: FlatVector): boolean;
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export declare function isInt(a: number): boolean;
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export declare function tanh(x: number): number;
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export declare function sizeToSquarishShape(size: number): [number, number];
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/**
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* Creates a new array with randomized indicies to a given quantity.
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*
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* ```js
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* const randomTen = tf.util.createShuffledIndices(10);
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* console.log(randomTen);
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* ```
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*
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* @param number Quantity of how many shuffled indicies to create.
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*/
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/** @doc {heading: 'Util', namespace: 'util'} */
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export declare function createShuffledIndices(n: number): Uint32Array;
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export declare function rightPad(a: string, size: number): string;
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export declare function repeatedTry(checkFn: () => boolean, delayFn?: (counter: number) => number, maxCounter?: number): Promise<void>;
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/**
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* Given the full size of the array and a shape that may contain -1 as the
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* implicit dimension, returns the inferred shape where -1 is replaced.
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* E.g. For shape=[2, -1, 3] and size=24, it will return [2, 4, 3].
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*
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* @param shape The shape, which may contain -1 in some dimension.
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* @param size The full size (number of elements) of the array.
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* @return The inferred shape where -1 is replaced with the inferred size.
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*/
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export declare function inferFromImplicitShape(shape: number[], size: number): number[];
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export declare function parseAxisParam(axis: number | number[], shape: number[]): number[];
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/** Reduces the shape by removing all dimensions of shape 1. */
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export declare function squeezeShape(shape: number[], axis?: number[]): {
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newShape: number[];
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keptDims: number[];
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};
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export declare function getTypedArrayFromDType<D extends NumericDataType>(dtype: D, size: number): DataTypeMap[D];
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export declare function getArrayFromDType<D extends DataType>(dtype: D, size: number): DataTypeMap[D];
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export declare function checkConversionForErrors<D extends DataType>(vals: DataTypeMap[D] | number[], dtype: D): void;
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/** Returns true if the dtype is valid. */
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export declare function isValidDtype(dtype: DataType): boolean;
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/**
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* Returns true if the new type can't encode the old type without loss of
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* precision.
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*/
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export declare function hasEncodingLoss(oldType: DataType, newType: DataType): boolean;
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export declare function isTypedArray(a: {}): a is Float32Array | Int32Array | Uint8Array;
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export declare function bytesPerElement(dtype: DataType): number;
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/**
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* Returns the approximate number of bytes allocated in the string array - 2
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* bytes per character. Computing the exact bytes for a native string in JS is
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* not possible since it depends on the encoding of the html page that serves
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* the website.
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*/
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export declare function bytesFromStringArray(arr: Uint8Array[]): number;
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/** Returns true if the value is a string. */
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export declare function isString(value: {}): value is string;
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export declare function isBoolean(value: {}): boolean;
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export declare function isNumber(value: {}): boolean;
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export declare function inferDtype(values: TensorLike): DataType;
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export declare function isFunction(f: Function): boolean;
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export declare function nearestDivisor(size: number, start: number): number;
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export declare function computeStrides(shape: number[]): number[];
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export declare function toTypedArray(a: TensorLike, dtype: DataType, debugMode: boolean): TypedArray;
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export declare function toNestedArray(shape: number[], a: TypedArray): number | any[];
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export declare function makeOnesTypedArray<D extends DataType>(size: number, dtype: D): DataTypeMap[D];
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export declare function makeZerosTypedArray<D extends DataType>(size: number, dtype: D): DataTypeMap[D];
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/**
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* Returns the current high-resolution time in milliseconds relative to an
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* arbitrary time in the past. It works across different platforms (node.js,
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* browsers).
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*
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* ```js
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* console.log(tf.util.now());
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* ```
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*/
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/** @doc {heading: 'Util', namespace: 'util'} */
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export declare function now(): number;
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export declare function assertNonNegativeIntegerDimensions(shape: number[]): void;
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/**
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* Returns a platform-specific implementation of
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* [`fetch`](https://developer.mozilla.org/en-US/docs/Web/API/Fetch_API).
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*
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* If `fetch` is defined on the global object (`window`, `process`, etc.),
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* `tf.util.fetch` returns that function.
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*
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* If not, `tf.util.fetch` returns a platform-specific solution.
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*
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* ```js
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* const resource = await tf.util.fetch('https://unpkg.com/@tensorflow/tfjs');
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* // handle response
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* ```
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*/
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/** @doc {heading: 'Util'} */
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export declare function fetch(path: string, requestInits?: RequestInit): Promise<Response>;
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/**
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* Encodes the provided string into bytes using the provided encoding scheme.
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*
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* @param s The string to encode.
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* @param encoding The encoding scheme. Defaults to utf-8.
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*
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*/
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/** @doc {heading: 'Util'} */
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export declare function encodeString(s: string, encoding?: string): Uint8Array;
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/**
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* Decodes the provided bytes into a string using the provided encoding scheme.
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* @param bytes The bytes to decode.
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*
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* @param encoding The encoding scheme. Defaults to utf-8.
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*/
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/** @doc {heading: 'Util'} */
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export declare function decodeString(bytes: Uint8Array, encoding?: string): string;
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/**
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* Computes flat index for a given location (multidimentionsal index) in a
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* Tensor/multidimensional array.
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*
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* @param locs Location in the tensor.
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* @param rank Rank of the tensor.
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* @param strides Tensor strides.
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*/
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export declare function locToIndex(locs: number[], rank: number, strides: number[]): number;
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/**
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* Computes the location (multidimensional index) in a tensor/multidimentional
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* array for a given flat index.
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*
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* @param index Index in flat array.
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* @param rank Rank of tensor.
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* @param strides Strides of tensor.
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*/
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export declare function indexToLoc(index: number, rank: number, strides: number[]): number[];
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