data2/LocalFaceRecognition.git

/**
 * @license
 * Copyright 2020 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.
 * =============================================================================
 */
/**
 * Shuffles the array in-place using Fisher-Yates algorithm.
 *
 * ```js
 * const a = [1, 2, 3, 4, 5];
 * tf.util.shuffle(a);
 * console.log(a);
 * ```
 *
 * @param array The array to shuffle in-place.
 *
 * @doc {heading: 'Util', namespace: 'util'}
 */
// tslint:disable-next-line:no-any
export function shuffle(array) {
    let counter = array.length;
    let index = 0;
    // While there are elements in the array
    while (counter > 0) {
        // Pick a random index
        index = (Math.random() * counter) | 0;
        // Decrease counter by 1
        counter--;
        // And swap the last element with it
        swap(array, counter, index);
    }
}
/**
 * Shuffles two arrays in-place the same way using Fisher-Yates algorithm.
 *
 * ```js
 * const a = [1,2,3,4,5];
 * const b = [11,22,33,44,55];
 * tf.util.shuffleCombo(a, b);
 * console.log(a, b);
 * ```
 *
 * @param array The first array to shuffle in-place.
 * @param array2 The second array to shuffle in-place with the same permutation
 *     as the first array.
 *
 * @doc {heading: 'Util', namespace: 'util'}
 */
export function shuffleCombo(
// tslint:disable-next-line:no-any
array, 
// tslint:disable-next-line:no-any
array2) {
    if (array.length !== array2.length) {
        throw new Error(`Array sizes must match to be shuffled together ` +
            `First array length was ${array.length}` +
            `Second array length was ${array2.length}`);
    }
    let counter = array.length;
    let index = 0;
    // While there are elements in the array
    while (counter > 0) {
        // Pick a random index
        index = (Math.random() * counter) | 0;
        // Decrease counter by 1
        counter--;
        // And swap the last element of each array with it
        swap(array, counter, index);
        swap(array2, counter, index);
    }
}
/** Clamps a value to a specified range. */
export function clamp(min, x, max) {
    return Math.max(min, Math.min(x, max));
}
export function nearestLargerEven(val) {
    return val % 2 === 0 ? val : val + 1;
}
export function swap(object, left, right) {
    const temp = object[left];
    object[left] = object[right];
    object[right] = temp;
}
export function sum(arr) {
    let sum = 0;
    for (let i = 0; i < arr.length; i++) {
        sum += arr[i];
    }
    return sum;
}
/**
 * Returns a sample from a uniform [a, b) distribution.
 *
 * @param a The minimum support (inclusive).
 * @param b The maximum support (exclusive).
 * @return A pseudorandom number on the half-open interval [a,b).
 */
export function randUniform(a, b) {
    const r = Math.random();
    return (b * r) + (1 - r) * a;
}
/** Returns the squared Euclidean distance between two vectors. */
export function distSquared(a, b) {
    let result = 0;
    for (let i = 0; i < a.length; i++) {
        const diff = Number(a[i]) - Number(b[i]);
        result += diff * diff;
    }
    return result;
}
/**
 * Asserts that the expression is true. Otherwise throws an error with the
 * provided message.
 *
 * ```js
 * const x = 2;
 * tf.util.assert(x === 2, 'x is not 2');
 * ```
 *
 * @param expr The expression to assert (as a boolean).
 * @param msg A function that returns the message to report when throwing an
 *     error. We use a function for performance reasons.
 *
 * @doc {heading: 'Util', namespace: 'util'}
 */
export function assert(expr, msg) {
    if (!expr) {
        throw new Error(typeof msg === 'string' ? msg : msg());
    }
}
export function assertShapesMatch(shapeA, shapeB, errorMessagePrefix = '') {
    assert(arraysEqual(shapeA, shapeB), () => errorMessagePrefix + ` Shapes ${shapeA} and ${shapeB} must match`);
}
export function assertNonNull(a) {
    assert(a != null, () => `The input to the tensor constructor must be a non-null value.`);
}
/**
 * Returns the size (number of elements) of the tensor given its shape.
 *
 * ```js
 * const shape = [3, 4, 2];
 * const size = tf.util.sizeFromShape(shape);
 * console.log(size);
 * ```
 *
 * @doc {heading: 'Util', namespace: 'util'}
 */
export function sizeFromShape(shape) {
    if (shape.length === 0) {
        // Scalar.
        return 1;
    }
    let size = shape[0];
    for (let i = 1; i < shape.length; i++) {
        size *= shape[i];
    }
    return size;
}
export function isScalarShape(shape) {
    return shape.length === 0;
}
export function arraysEqualWithNull(n1, n2) {
    if (n1 === n2) {
        return true;
    }
    if (n1 == null || n2 == null) {
        return false;
    }
    if (n1.length !== n2.length) {
        return false;
    }
    for (let i = 0; i < n1.length; i++) {
        if (n1[i] !== null && n2[i] !== null && n1[i] !== n2[i]) {
            return false;
        }
    }
    return true;
}
export function arraysEqual(n1, n2) {
    if (n1 === n2) {
        return true;
    }
    if (n1 == null || n2 == null) {
        return false;
    }
    if (n1.length !== n2.length) {
        return false;
    }
    for (let i = 0; i < n1.length; i++) {
        if (n1[i] !== n2[i]) {
            return false;
        }
    }
    return true;
}
export function isInt(a) {
    return a % 1 === 0;
}
export function tanh(x) {
    // tslint:disable-next-line:no-any
    if (Math.tanh != null) {
        // tslint:disable-next-line:no-any
        return Math.tanh(x);
    }
    if (x === Infinity) {
        return 1;
    }
    else if (x === -Infinity) {
        return -1;
    }
    else {
        const e2x = Math.exp(2 * x);
        return (e2x - 1) / (e2x + 1);
    }
}
export function sizeToSquarishShape(size) {
    const width = Math.ceil(Math.sqrt(size));
    return [width, Math.ceil(size / width)];
}
/**
 * Creates a new array with randomized indices to a given quantity.
 *
 * ```js
 * const randomTen = tf.util.createShuffledIndices(10);
 * console.log(randomTen);
 * ```
 *
 * @param number Quantity of how many shuffled indices to create.
 *
 * @doc {heading: 'Util', namespace: 'util'}
 */
export function createShuffledIndices(n) {
    const shuffledIndices = new Uint32Array(n);
    for (let i = 0; i < n; ++i) {
        shuffledIndices[i] = i;
    }
    shuffle(shuffledIndices);
    return shuffledIndices;
}
export function rightPad(a, size) {
    if (size <= a.length) {
        return a;
    }
    return a + ' '.repeat(size - a.length);
}
export function repeatedTry(checkFn, delayFn = (counter) => 0, maxCounter, scheduleFn) {
    return new Promise((resolve, reject) => {
        let tryCount = 0;
        const tryFn = () => {
            if (checkFn()) {
                resolve();
                return;
            }
            tryCount++;
            const nextBackoff = delayFn(tryCount);
            if (maxCounter != null && tryCount >= maxCounter) {
                reject();
                return;
            }
            if (scheduleFn != null) {
                scheduleFn(tryFn, nextBackoff);
            }
            else {
                // google3 does not allow assigning another variable to setTimeout.
                // Don't refactor this so scheduleFn has a default value of setTimeout.
                setTimeout(tryFn, nextBackoff);
            }
        };
        tryFn();
    });
}
/**
 * Given the full size of the array and a shape that may contain -1 as the
 * implicit dimension, returns the inferred shape where -1 is replaced.
 * E.g. For shape=[2, -1, 3] and size=24, it will return [2, 4, 3].
 *
 * @param shape The shape, which may contain -1 in some dimension.
 * @param size The full size (number of elements) of the array.
 * @return The inferred shape where -1 is replaced with the inferred size.
 */
export function inferFromImplicitShape(shape, size) {
    let shapeProd = 1;
    let implicitIdx = -1;
    for (let i = 0; i < shape.length; ++i) {
        if (shape[i] >= 0) {
            shapeProd *= shape[i];
        }
        else if (shape[i] === -1) {
            if (implicitIdx !== -1) {
                throw Error(`Shapes can only have 1 implicit size. ` +
                    `Found -1 at dim ${implicitIdx} and dim ${i}`);
            }
            implicitIdx = i;
        }
        else if (shape[i] < 0) {
            throw Error(`Shapes can not be < 0. Found ${shape[i]} at dim ${i}`);
        }
    }
    if (implicitIdx === -1) {
        if (size > 0 && size !== shapeProd) {
            throw Error(`Size(${size}) must match the product of shape ${shape}`);
        }
        return shape;
    }
    if (shapeProd === 0) {
        throw Error(`Cannot infer the missing size in [${shape}] when ` +
            `there are 0 elements`);
    }
    if (size % shapeProd !== 0) {
        throw Error(`The implicit shape can't be a fractional number. ` +
            `Got ${size} / ${shapeProd}`);
    }
    const newShape = shape.slice();
    newShape[implicitIdx] = size / shapeProd;
    return newShape;
}
export function parseAxisParam(axis, shape) {
    const rank = shape.length;
    // Normalize input
    axis = axis == null ? shape.map((s, i) => i) : [].concat(axis);
    // Check for valid range
    assert(axis.every(ax => ax >= -rank && ax < rank), () => `All values in axis param must be in range [-${rank}, ${rank}) but ` +
        `got axis ${axis}`);
    // Check for only integers
    assert(axis.every(ax => isInt(ax)), () => `All values in axis param must be integers but ` +
        `got axis ${axis}`);
    // Handle negative axis.
    return axis.map(a => a < 0 ? rank + a : a);
}
/** Reduces the shape by removing all dimensions of shape 1. */
export function squeezeShape(shape, axis) {
    const newShape = [];
    const keptDims = [];
    const isEmptyArray = axis != null && Array.isArray(axis) && axis.length === 0;
    const axes = (axis == null || isEmptyArray) ?
        null :
        parseAxisParam(axis, shape).sort();
    let j = 0;
    for (let i = 0; i < shape.length; ++i) {
        if (axes != null) {
            if (axes[j] === i && shape[i] !== 1) {
                throw new Error(`Can't squeeze axis ${i} since its dim '${shape[i]}' is not 1`);
            }
            if ((axes[j] == null || axes[j] > i) && shape[i] === 1) {
                newShape.push(shape[i]);
                keptDims.push(i);
            }
            if (axes[j] <= i) {
                j++;
            }
        }
        if (shape[i] !== 1) {
            newShape.push(shape[i]);
            keptDims.push(i);
        }
    }
    return { newShape, keptDims };
}
export function getTypedArrayFromDType(dtype, size) {
    return getArrayFromDType(dtype, size);
}
export function getArrayFromDType(dtype, size) {
    let values = null;
    if (dtype == null || dtype === 'float32') {
        values = new Float32Array(size);
    }
    else if (dtype === 'int32') {
        values = new Int32Array(size);
    }
    else if (dtype === 'bool') {
        values = new Uint8Array(size);
    }
    else if (dtype === 'string') {
        values = new Array(size);
    }
    else {
        throw new Error(`Unknown data type ${dtype}`);
    }
    return values;
}
export function checkConversionForErrors(vals, dtype) {
    for (let i = 0; i < vals.length; i++) {
        const num = vals[i];
        if (isNaN(num) || !isFinite(num)) {
            throw Error(`A tensor of type ${dtype} being uploaded contains ${num}.`);
        }
    }
}
/** Returns true if the dtype is valid. */
export function isValidDtype(dtype) {
    return dtype === 'bool' || dtype === 'complex64' || dtype === 'float32' ||
        dtype === 'int32' || dtype === 'string';
}
/**
 * Returns true if the new type can't encode the old type without loss of
 * precision.
 */
export function hasEncodingLoss(oldType, newType) {
    if (newType === 'complex64') {
        return false;
    }
    if (newType === 'float32' && oldType !== 'complex64') {
        return false;
    }
    if (newType === 'int32' && oldType !== 'float32' && oldType !== 'complex64') {
        return false;
    }
    if (newType === 'bool' && oldType === 'bool') {
        return false;
    }
    return true;
}
export function bytesPerElement(dtype) {
    if (dtype === 'float32' || dtype === 'int32') {
        return 4;
    }
    else if (dtype === 'complex64') {
        return 8;
    }
    else if (dtype === 'bool') {
        return 1;
    }
    else {
        throw new Error(`Unknown dtype ${dtype}`);
    }
}
/**
 * Returns the approximate number of bytes allocated in the string array - 2
 * bytes per character. Computing the exact bytes for a native string in JS
 * is not possible since it depends on the encoding of the html page that
 * serves the website.
 */
export function bytesFromStringArray(arr) {
    if (arr == null) {
        return 0;
    }
    let bytes = 0;
    arr.forEach(x => bytes += x.length);
    return bytes;
}
/** Returns true if the value is a string. */
export function isString(value) {
    return typeof value === 'string' || value instanceof String;
}
export function isBoolean(value) {
    return typeof value === 'boolean';
}
export function isNumber(value) {
    return typeof value === 'number';
}
export function inferDtype(values) {
    if (Array.isArray(values)) {
        return inferDtype(values[0]);
    }
    if (values instanceof Float32Array) {
        return 'float32';
    }
    else if (values instanceof Int32Array || values instanceof Uint8Array ||
        values instanceof Uint8ClampedArray) {
        return 'int32';
    }
    else if (isNumber(values)) {
        return 'float32';
    }
    else if (isString(values)) {
        return 'string';
    }
    else if (isBoolean(values)) {
        return 'bool';
    }
    return 'float32';
}
export function isFunction(f) {
    return !!(f && f.constructor && f.call && f.apply);
}
export function nearestDivisor(size, start) {
    for (let i = start; i < size; ++i) {
        if (size % i === 0) {
            return i;
        }
    }
    return size;
}
export function computeStrides(shape) {
    const rank = shape.length;
    if (rank < 2) {
        return [];
    }
    // Last dimension has implicit stride of 1, thus having D-1 (instead of D)
    // strides.
    const strides = new Array(rank - 1);
    strides[rank - 2] = shape[rank - 1];
    for (let i = rank - 3; i >= 0; --i) {
        strides[i] = strides[i + 1] * shape[i + 1];
    }
    return strides;
}
function createNestedArray(offset, shape, a, isComplex = false) {
    const ret = new Array();
    if (shape.length === 1) {
        const d = shape[0] * (isComplex ? 2 : 1);
        for (let i = 0; i < d; i++) {
            ret[i] = a[offset + i];
        }
    }
    else {
        const d = shape[0];
        const rest = shape.slice(1);
        const len = rest.reduce((acc, c) => acc * c) * (isComplex ? 2 : 1);
        for (let i = 0; i < d; i++) {
            ret[i] = createNestedArray(offset + i * len, rest, a, isComplex);
        }
    }
    return ret;
}
// Provide a nested array of TypedArray in given shape.
export function toNestedArray(shape, a, isComplex = false) {
    if (shape.length === 0) {
        // Scalar type should return a single number.
        return a[0];
    }
    const size = shape.reduce((acc, c) => acc * c) * (isComplex ? 2 : 1);
    if (size === 0) {
        // A tensor with shape zero should be turned into empty list.
        return [];
    }
    if (size !== a.length) {
        throw new Error(`[${shape}] does not match the input size ${a.length}${isComplex ? ' for a complex tensor' : ''}.`);
    }
    return createNestedArray(0, shape, a, isComplex);
}
export function convertBackendValuesAndArrayBuffer(data, dtype) {
    // If is type Uint8Array[], return it directly.
    if (Array.isArray(data)) {
        return data;
    }
    if (dtype === 'float32') {
        return data instanceof Float32Array ? data : new Float32Array(data);
    }
    else if (dtype === 'int32') {
        return data instanceof Int32Array ? data : new Int32Array(data);
    }
    else if (dtype === 'bool' || dtype === 'string') {
        return Uint8Array.from(new Int32Array(data));
    }
    else {
        throw new Error(`Unknown dtype ${dtype}`);
    }
}
export function makeOnesTypedArray(size, dtype) {
    const array = makeZerosTypedArray(size, dtype);
    for (let i = 0; i < array.length; i++) {
        array[i] = 1;
    }
    return array;
}
export function makeZerosTypedArray(size, dtype) {
    if (dtype == null || dtype === 'float32' || dtype === 'complex64') {
        return new Float32Array(size);
    }
    else if (dtype === 'int32') {
        return new Int32Array(size);
    }
    else if (dtype === 'bool') {
        return new Uint8Array(size);
    }
    else {
        throw new Error(`Unknown data type ${dtype}`);
    }
}
/**
 * Make nested `TypedArray` filled with zeros.
 * @param shape The shape information for the nested array.
 * @param dtype dtype of the array element.
 */
export function makeZerosNestedTypedArray(shape, dtype) {
    const size = shape.reduce((prev, curr) => prev * curr, 1);
    if (dtype == null || dtype === 'float32') {
        return toNestedArray(shape, new Float32Array(size));
    }
    else if (dtype === 'int32') {
        return toNestedArray(shape, new Int32Array(size));
    }
    else if (dtype === 'bool') {
        return toNestedArray(shape, new Uint8Array(size));
    }
    else {
        throw new Error(`Unknown data type ${dtype}`);
    }
}
export function assertNonNegativeIntegerDimensions(shape) {
    shape.forEach(dimSize => {
        assert(Number.isInteger(dimSize) && dimSize >= 0, () => `Tensor must have a shape comprised of positive integers but got ` +
            `shape [${shape}].`);
    });
}
/**
 * Computes flat index for a given location (multidimentionsal index) in a
 * Tensor/multidimensional array.
 *
 * @param locs Location in the tensor.
 * @param rank Rank of the tensor.
 * @param strides Tensor strides.
 */
export function locToIndex(locs, rank, strides) {
    if (rank === 0) {
        return 0;
    }
    else if (rank === 1) {
        return locs[0];
    }
    let index = locs[locs.length - 1];
    for (let i = 0; i < locs.length - 1; ++i) {
        index += strides[i] * locs[i];
    }
    return index;
}
/**
 * Computes the location (multidimensional index) in a
 * tensor/multidimentional array for a given flat index.
 *
 * @param index Index in flat array.
 * @param rank Rank of tensor.
 * @param strides Strides of tensor.
 */
export function indexToLoc(index, rank, strides) {
    if (rank === 0) {
        return [];
    }
    else if (rank === 1) {
        return [index];
    }
    const locs = new Array(rank);
    for (let i = 0; i < locs.length - 1; ++i) {
        locs[i] = Math.floor(index / strides[i]);
        index -= locs[i] * strides[i];
    }
    locs[locs.length - 1] = index;
    return locs;
}
/**
 * This method asserts whether an object is a Promise instance.
 * @param object
 */
// tslint:disable-next-line: no-any
export function isPromise(object) {
    //  We chose to not use 'obj instanceOf Promise' for two reasons:
    //  1. It only reliably works for es6 Promise, not other Promise
    //  implementations.
    //  2. It doesn't work with framework that uses zone.js. zone.js monkey
    //  patch the async calls, so it is possible the obj (patched) is
    //  comparing to a pre-patched Promise.
    return object && object.then && typeof object.then === 'function';
}
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* @license\n * Copyright 2020 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 {BackendValues, DataType, DataTypeMap, FlatVector, NumericDataType, TensorLike, TypedArray, WebGLData, WebGPUData} from './types';\n\n/**\n * Shuffles the array in-place using Fisher-Yates algorithm.\n *\n * ```js\n * const a = [1, 2, 3, 4, 5];\n * tf.util.shuffle(a);\n * console.log(a);\n * ```\n *\n * @param array The array to shuffle in-place.\n *\n * @doc {heading: 'Util', namespace: 'util'}\n */\n// tslint:disable-next-line:no-any\nexport function shuffle(array: any[]|Uint32Array|Int32Array|\n                        Float32Array): void {\n  let counter = array.length;\n  let index = 0;\n  // While there are elements in the array\n  while (counter > 0) {\n    // Pick a random index\n    index = (Math.random() * counter) | 0;\n    // Decrease counter by 1\n    counter--;\n    // And swap the last element with it\n    swap(array, counter, index);\n  }\n}\n\n/**\n * Shuffles two arrays in-place the same way using Fisher-Yates algorithm.\n *\n * ```js\n * const a = [1,2,3,4,5];\n * const b = [11,22,33,44,55];\n * tf.util.shuffleCombo(a, b);\n * console.log(a, b);\n * ```\n *\n * @param array The first array to shuffle in-place.\n * @param array2 The second array to shuffle in-place with the same permutation\n *     as the first array.\n *\n * @doc {heading: 'Util', namespace: 'util'}\n */\nexport function shuffleCombo(\n    // tslint:disable-next-line:no-any\n    array: any[]|Uint32Array|Int32Array|Float32Array,\n    // tslint:disable-next-line:no-any\n    array2: any[]|Uint32Array|Int32Array|Float32Array): void {\n  if (array.length !== array2.length) {\n    throw new Error(\n        `Array sizes must match to be shuffled together ` +\n        `First array length was ${array.length}` +\n        `Second array length was ${array2.length}`);\n  }\n  let counter = array.length;\n  let index = 0;\n  // While there are elements in the array\n  while (counter > 0) {\n    // Pick a random index\n    index = (Math.random() * counter) | 0;\n    // Decrease counter by 1\n    counter--;\n    // And swap the last element of each array with it\n    swap(array, counter, index);\n    swap(array2, counter, index);\n  }\n}\n\n/** Clamps a value to a specified range. */\nexport function clamp(min: number, x: number, max: number): number {\n  return Math.max(min, Math.min(x, max));\n}\n\nexport function nearestLargerEven(val: number): number {\n  return val % 2 === 0 ? val : val + 1;\n}\n\nexport function swap<T>(\n    object: {[index: number]: T}, left: number, right: number) {\n  const temp = object[left];\n  object[left] = object[right];\n  object[right] = temp;\n}\n\nexport function sum(arr: number[]): number {\n  let sum = 0;\n  for (let i = 0; i < arr.length; i++) {\n    sum += arr[i];\n  }\n  return sum;\n}\n\n/**\n * Returns a sample from a uniform [a, b) distribution.\n *\n * @param a The minimum support (inclusive).\n * @param b The maximum support (exclusive).\n * @return A pseudorandom number on the half-open interval [a,b).\n */\nexport function randUniform(a: number, b: number) {\n  const r = Math.random();\n  return (b * r) + (1 - r) * a;\n}\n\n/** Returns the squared Euclidean distance between two vectors. */\nexport function distSquared(a: FlatVector, b: FlatVector): number {\n  let result = 0;\n  for (let i = 0; i < a.length; i++) {\n    const diff = Number(a[i]) - Number(b[i]);\n    result += diff * diff;\n  }\n  return result;\n}\n\n/**\n * Asserts that the expression is true. Otherwise throws an error with the\n * provided message.\n *\n * ```js\n * const x = 2;\n * tf.util.assert(x === 2, 'x is not 2');\n * ```\n *\n * @param expr The expression to assert (as a boolean).\n * @param msg A function that returns the message to report when throwing an\n *     error. We use a function for performance reasons.\n *\n * @doc {heading: 'Util', namespace: 'util'}\n */\nexport function assert(expr: boolean, msg: () => string) {\n  if (!expr) {\n    throw new Error(typeof msg === 'string' ? msg : msg());\n  }\n}\n\nexport function assertShapesMatch(\n    shapeA: number[], shapeB: number[], errorMessagePrefix = ''): void {\n  assert(\n      arraysEqual(shapeA, shapeB),\n      () => errorMessagePrefix + ` Shapes ${shapeA} and ${shapeB} must match`);\n}\n\nexport function assertNonNull(a: TensorLike): void {\n  assert(\n      a != null,\n      () => `The input to the tensor constructor must be a non-null value.`);\n}\n\n/**\n * Returns the size (number of elements) of the tensor given its shape.\n *\n * ```js\n * const shape = [3, 4, 2];\n * const size = tf.util.sizeFromShape(shape);\n * console.log(size);\n * ```\n *\n * @doc {heading: 'Util', namespace: 'util'}\n */\nexport function sizeFromShape(shape: number[]): number {\n  if (shape.length === 0) {\n    // Scalar.\n    return 1;\n  }\n  let size = shape[0];\n  for (let i = 1; i < shape.length; i++) {\n    size *= shape[i];\n  }\n  return size;\n}\n\nexport function isScalarShape(shape: number[]): boolean {\n  return shape.length === 0;\n}\n\nexport function arraysEqualWithNull(n1: number[], n2: number[]) {\n  if (n1 === n2) {\n    return true;\n  }\n\n  if (n1 == null || n2 == null) {\n    return false;\n  }\n\n  if (n1.length !== n2.length) {\n    return false;\n  }\n\n  for (let i = 0; i < n1.length; i++) {\n    if (n1[i] !== null && n2[i] !== null && n1[i] !== n2[i]) {\n      return false;\n    }\n  }\n  return true;\n}\n\nexport function arraysEqual(n1: FlatVector, n2: FlatVector) {\n  if (n1 === n2) {\n    return true;\n  }\n  if (n1 == null || n2 == null) {\n    return false;\n  }\n\n  if (n1.length !== n2.length) {\n    return false;\n  }\n  for (let i = 0; i < n1.length; i++) {\n    if (n1[i] !== n2[i]) {\n      return false;\n    }\n  }\n  return true;\n}\n\nexport function isInt(a: number): boolean {\n  return a % 1 === 0;\n}\n\nexport function tanh(x: number): number {\n  // tslint:disable-next-line:no-any\n  if ((Math as any).tanh != null) {\n    // tslint:disable-next-line:no-any\n    return (Math as any).tanh(x);\n  }\n  if (x === Infinity) {\n    return 1;\n  } else if (x === -Infinity) {\n    return -1;\n  } else {\n    const e2x = Math.exp(2 * x);\n    return (e2x - 1) / (e2x + 1);\n  }\n}\n\nexport function sizeToSquarishShape(size: number): [number, number] {\n  const width = Math.ceil(Math.sqrt(size));\n  return [width, Math.ceil(size / width)];\n}\n\n/**\n * Creates a new array with randomized indices to a given quantity.\n *\n * ```js\n * const randomTen = tf.util.createShuffledIndices(10);\n * console.log(randomTen);\n * ```\n *\n * @param number Quantity of how many shuffled indices to create.\n *\n * @doc {heading: 'Util', namespace: 'util'}\n */\nexport function createShuffledIndices(n: number): Uint32Array {\n  const shuffledIndices = new Uint32Array(n);\n  for (let i = 0; i < n; ++i) {\n    shuffledIndices[i] = i;\n  }\n  shuffle(shuffledIndices);\n  return shuffledIndices;\n}\n\nexport function rightPad(a: string, size: number): string {\n  if (size <= a.length) {\n    return a;\n  }\n  return a + ' '.repeat(size - a.length);\n}\n\nexport function repeatedTry(\n    checkFn: () => boolean, delayFn = (counter: number) => 0,\n    maxCounter?: number,\n    scheduleFn?: (functionRef: Function, delay: number) =>\n        void): Promise<void> {\n  return new Promise<void>((resolve, reject) => {\n    let tryCount = 0;\n\n    const tryFn = () => {\n      if (checkFn()) {\n        resolve();\n        return;\n      }\n\n      tryCount++;\n\n      const nextBackoff = delayFn(tryCount);\n\n      if (maxCounter != null && tryCount >= maxCounter) {\n        reject();\n        return;\n      }\n\n      if (scheduleFn != null) {\n        scheduleFn(tryFn, nextBackoff);\n      } else {\n        // google3 does not allow assigning another variable to setTimeout.\n        // Don't refactor this so scheduleFn has a default value of setTimeout.\n        setTimeout(tryFn, nextBackoff);\n      }\n    };\n\n    tryFn();\n  });\n}\n\n/**\n * Given the full size of the array and a shape that may contain -1 as the\n * implicit dimension, returns the inferred shape where -1 is replaced.\n * E.g. For shape=[2, -1, 3] and size=24, it will return [2, 4, 3].\n *\n * @param shape The shape, which may contain -1 in some dimension.\n * @param size The full size (number of elements) of the array.\n * @return The inferred shape where -1 is replaced with the inferred size.\n */\nexport function inferFromImplicitShape(\n    shape: number[], size: number): number[] {\n  let shapeProd = 1;\n  let implicitIdx = -1;\n\n  for (let i = 0; i < shape.length; ++i) {\n    if (shape[i] >= 0) {\n      shapeProd *= shape[i];\n    } else if (shape[i] === -1) {\n      if (implicitIdx !== -1) {\n        throw Error(\n            `Shapes can only have 1 implicit size. ` +\n            `Found -1 at dim ${implicitIdx} and dim ${i}`);\n      }\n      implicitIdx = i;\n    } else if (shape[i] < 0) {\n      throw Error(`Shapes can not be < 0. Found ${shape[i]} at dim ${i}`);\n    }\n  }\n\n  if (implicitIdx === -1) {\n    if (size > 0 && size !== shapeProd) {\n      throw Error(`Size(${size}) must match the product of shape ${shape}`);\n    }\n    return shape;\n  }\n\n  if (shapeProd === 0) {\n    throw Error(\n        `Cannot infer the missing size in [${shape}] when ` +\n        `there are 0 elements`);\n  }\n  if (size % shapeProd !== 0) {\n    throw Error(\n        `The implicit shape can't be a fractional number. ` +\n        `Got ${size} / ${shapeProd}`);\n  }\n\n  const newShape = shape.slice();\n  newShape[implicitIdx] = size / shapeProd;\n  return newShape;\n}\n\nexport function parseAxisParam(\n    axis: number|number[], shape: number[]): number[] {\n  const rank = shape.length;\n\n  // Normalize input\n  axis = axis == null ? shape.map((s, i) => i) : [].concat(axis);\n\n  // Check for valid range\n  assert(\n      axis.every(ax => ax >= -rank && ax < rank),\n      () =>\n          `All values in axis param must be in range [-${rank}, ${rank}) but ` +\n          `got axis ${axis}`);\n\n  // Check for only integers\n  assert(\n      axis.every(ax => isInt(ax)),\n      () => `All values in axis param must be integers but ` +\n          `got axis ${axis}`);\n\n  // Handle negative axis.\n  return axis.map(a => a < 0 ? rank + a : a);\n}\n\n/** Reduces the shape by removing all dimensions of shape 1. */\nexport function squeezeShape(shape: number[], axis?: number[]):\n    {newShape: number[], keptDims: number[]} {\n  const newShape: number[] = [];\n  const keptDims: number[] = [];\n  const isEmptyArray = axis != null && Array.isArray(axis) && axis.length === 0;\n  const axes = (axis == null || isEmptyArray) ?\n      null :\n      parseAxisParam(axis, shape).sort();\n  let j = 0;\n  for (let i = 0; i < shape.length; ++i) {\n    if (axes != null) {\n      if (axes[j] === i && shape[i] !== 1) {\n        throw new Error(\n            `Can't squeeze axis ${i} since its dim '${shape[i]}' is not 1`);\n      }\n      if ((axes[j] == null || axes[j] > i) && shape[i] === 1) {\n        newShape.push(shape[i]);\n        keptDims.push(i);\n      }\n      if (axes[j] <= i) {\n        j++;\n      }\n    }\n    if (shape[i] !== 1) {\n      newShape.push(shape[i]);\n      keptDims.push(i);\n    }\n  }\n  return {newShape, keptDims};\n}\n\nexport function getTypedArrayFromDType<D extends NumericDataType>(\n    dtype: D, size: number): DataTypeMap[D] {\n  return getArrayFromDType<D>(dtype, size);\n}\n\nexport function getArrayFromDType<D extends DataType>(\n    dtype: D, size: number): DataTypeMap[D] {\n  let values = null;\n  if (dtype == null || dtype === 'float32') {\n    values = new Float32Array(size);\n  } else if (dtype === 'int32') {\n    values = new Int32Array(size);\n  } else if (dtype === 'bool') {\n    values = new Uint8Array(size);\n  } else if (dtype === 'string') {\n    values = new Array<string>(size);\n  } else {\n    throw new Error(`Unknown data type ${dtype}`);\n  }\n  return values as DataTypeMap[D];\n}\n\nexport function checkConversionForErrors<D extends DataType>(\n    vals: DataTypeMap[D]|number[], dtype: D): void {\n  for (let i = 0; i < vals.length; i++) {\n    const num = vals[i] as number;\n    if (isNaN(num) || !isFinite(num)) {\n      throw Error(`A tensor of type ${dtype} being uploaded contains ${num}.`);\n    }\n  }\n}\n\n/** Returns true if the dtype is valid. */\nexport function isValidDtype(dtype: DataType): boolean {\n  return dtype === 'bool' || dtype === 'complex64' || dtype === 'float32' ||\n      dtype === 'int32' || dtype === 'string';\n}\n\n/**\n * Returns true if the new type can't encode the old type without loss of\n * precision.\n */\nexport function hasEncodingLoss(oldType: DataType, newType: DataType): boolean {\n  if (newType === 'complex64') {\n    return false;\n  }\n  if (newType === 'float32' && oldType !== 'complex64') {\n    return false;\n  }\n  if (newType === 'int32' && oldType !== 'float32' && oldType !== 'complex64') {\n    return false;\n  }\n  if (newType === 'bool' && oldType === 'bool') {\n    return false;\n  }\n  return true;\n}\n\nexport function bytesPerElement(dtype: DataType): number {\n  if (dtype === 'float32' || dtype === 'int32') {\n    return 4;\n  } else if (dtype === 'complex64') {\n    return 8;\n  } else if (dtype === 'bool') {\n    return 1;\n  } else {\n    throw new Error(`Unknown dtype ${dtype}`);\n  }\n}\n\n/**\n * Returns the approximate number of bytes allocated in the string array - 2\n * bytes per character. Computing the exact bytes for a native string in JS\n * is not possible since it depends on the encoding of the html page that\n * serves the website.\n */\nexport function bytesFromStringArray(arr: Uint8Array[]): number {\n  if (arr == null) {\n    return 0;\n  }\n  let bytes = 0;\n  arr.forEach(x => bytes += x.length);\n  return bytes;\n}\n\n/** Returns true if the value is a string. */\nexport function isString(value: {}): value is string {\n  return typeof value === 'string' || value instanceof String;\n}\n\nexport function isBoolean(value: {}): boolean {\n  return typeof value === 'boolean';\n}\n\nexport function isNumber(value: {}): boolean {\n  return typeof value === 'number';\n}\n\nexport function inferDtype(values: TensorLike|WebGLData|WebGPUData): DataType {\n  if (Array.isArray(values)) {\n    return inferDtype(values[0]);\n  }\n  if (values instanceof Float32Array) {\n    return 'float32';\n  } else if (\n      values instanceof Int32Array || values instanceof Uint8Array ||\n      values instanceof Uint8ClampedArray) {\n    return 'int32';\n  } else if (isNumber(values)) {\n    return 'float32';\n  } else if (isString(values)) {\n    return 'string';\n  } else if (isBoolean(values)) {\n    return 'bool';\n  }\n  return 'float32';\n}\n\nexport function isFunction(f: Function) {\n  return !!(f && f.constructor && f.call && f.apply);\n}\n\nexport function nearestDivisor(size: number, start: number): number {\n  for (let i = start; i < size; ++i) {\n    if (size % i === 0) {\n      return i;\n    }\n  }\n  return size;\n}\n\nexport function computeStrides(shape: number[]): number[] {\n  const rank = shape.length;\n  if (rank < 2) {\n    return [];\n  }\n\n  // Last dimension has implicit stride of 1, thus having D-1 (instead of D)\n  // strides.\n  const strides = new Array(rank - 1);\n  strides[rank - 2] = shape[rank - 1];\n  for (let i = rank - 3; i >= 0; --i) {\n    strides[i] = strides[i + 1] * shape[i + 1];\n  }\n  return strides;\n}\n\nfunction createNestedArray(\n    offset: number, shape: number[], a: TypedArray, isComplex = false) {\n  const ret = new Array();\n  if (shape.length === 1) {\n    const d = shape[0] * (isComplex ? 2 : 1);\n    for (let i = 0; i < d; i++) {\n      ret[i] = a[offset + i];\n    }\n  } else {\n    const d = shape[0];\n    const rest = shape.slice(1);\n    const len = rest.reduce((acc, c) => acc * c) * (isComplex ? 2 : 1);\n    for (let i = 0; i < d; i++) {\n      ret[i] = createNestedArray(offset + i * len, rest, a, isComplex);\n    }\n  }\n  return ret;\n}\n\n// Provide a nested array of TypedArray in given shape.\nexport function toNestedArray(\n    shape: number[], a: TypedArray, isComplex = false) {\n  if (shape.length === 0) {\n    // Scalar type should return a single number.\n    return a[0];\n  }\n  const size = shape.reduce((acc, c) => acc * c) * (isComplex ? 2 : 1);\n  if (size === 0) {\n    // A tensor with shape zero should be turned into empty list.\n    return [];\n  }\n  if (size !== a.length) {\n    throw new Error(`[${shape}] does not match the input size ${a.length}${\n        isComplex ? ' for a complex tensor' : ''}.`);\n  }\n\n  return createNestedArray(0, shape, a, isComplex);\n}\n\nexport function convertBackendValuesAndArrayBuffer(\n    data: BackendValues|ArrayBuffer, dtype: DataType) {\n  // If is type Uint8Array[], return it directly.\n  if (Array.isArray(data)) {\n    return data;\n  }\n  if (dtype === 'float32') {\n    return data instanceof Float32Array ? data : new Float32Array(data);\n  } else if (dtype === 'int32') {\n    return data instanceof Int32Array ? data : new Int32Array(data);\n  } else if (dtype === 'bool' || dtype === 'string') {\n    return Uint8Array.from(new Int32Array(data));\n  } else {\n    throw new Error(`Unknown dtype ${dtype}`);\n  }\n}\n\nexport function makeOnesTypedArray<D extends DataType>(\n    size: number, dtype: D): DataTypeMap[D] {\n  const array = makeZerosTypedArray(size, dtype);\n  for (let i = 0; i < array.length; i++) {\n    array[i] = 1;\n  }\n  return array;\n}\n\nexport function makeZerosTypedArray<D extends DataType>(\n    size: number, dtype: D): DataTypeMap[D] {\n  if (dtype == null || dtype === 'float32' || dtype === 'complex64') {\n    return new Float32Array(size) as DataTypeMap[D];\n  } else if (dtype === 'int32') {\n    return new Int32Array(size) as DataTypeMap[D];\n  } else if (dtype === 'bool') {\n    return new Uint8Array(size) as DataTypeMap[D];\n  } else {\n    throw new Error(`Unknown data type ${dtype}`);\n  }\n}\n\n/**\n * Make nested `TypedArray` filled with zeros.\n * @param shape The shape information for the nested array.\n * @param dtype dtype of the array element.\n */\nexport function makeZerosNestedTypedArray<D extends DataType>(\n    shape: number[], dtype: D) {\n  const size = shape.reduce((prev, curr) => prev * curr, 1);\n  if (dtype == null || dtype === 'float32') {\n    return toNestedArray(shape, new Float32Array(size));\n  } else if (dtype === 'int32') {\n    return toNestedArray(shape, new Int32Array(size));\n  } else if (dtype === 'bool') {\n    return toNestedArray(shape, new Uint8Array(size));\n  } else {\n    throw new Error(`Unknown data type ${dtype}`);\n  }\n}\n\nexport function assertNonNegativeIntegerDimensions(shape: number[]) {\n  shape.forEach(dimSize => {\n    assert(\n        Number.isInteger(dimSize) && dimSize >= 0,\n        () =>\n            `Tensor must have a shape comprised of positive integers but got ` +\n            `shape [${shape}].`);\n  });\n}\n\n/**\n * Computes flat index for a given location (multidimentionsal index) in a\n * Tensor/multidimensional array.\n *\n * @param locs Location in the tensor.\n * @param rank Rank of the tensor.\n * @param strides Tensor strides.\n */\nexport function locToIndex(\n    locs: number[], rank: number, strides: number[]): number {\n  if (rank === 0) {\n    return 0;\n  } else if (rank === 1) {\n    return locs[0];\n  }\n  let index = locs[locs.length - 1];\n  for (let i = 0; i < locs.length - 1; ++i) {\n    index += strides[i] * locs[i];\n  }\n  return index;\n}\n\n/**\n * Computes the location (multidimensional index) in a\n * tensor/multidimentional array for a given flat index.\n *\n * @param index Index in flat array.\n * @param rank Rank of tensor.\n * @param strides Strides of tensor.\n */\nexport function indexToLoc(\n    index: number, rank: number, strides: number[]): number[] {\n  if (rank === 0) {\n    return [];\n  } else if (rank === 1) {\n    return [index];\n  }\n  const locs: number[] = new Array(rank);\n  for (let i = 0; i < locs.length - 1; ++i) {\n    locs[i] = Math.floor(index / strides[i]);\n    index -= locs[i] * strides[i];\n  }\n  locs[locs.length - 1] = index;\n  return locs;\n}\n\n/**\n * This method asserts whether an object is a Promise instance.\n * @param object\n */\n// tslint:disable-next-line: no-any\nexport function isPromise(object: any): object is Promise<unknown> {\n  //  We chose to not use 'obj instanceOf Promise' for two reasons:\n  //  1. It only reliably works for es6 Promise, not other Promise\n  //  implementations.\n  //  2. It doesn't work with framework that uses zone.js. zone.js monkey\n  //  patch the async calls, so it is possible the obj (patched) is\n  //  comparing to a pre-patched Promise.\n  return object && object.then && typeof object.then === 'function';\n}\n"]}