@tensorflow/tfjs-layers
Version:
TensorFlow layers API in JavaScript
152 lines • 13.7 kB
JavaScript
/**
* @license
* Copyright 2018 Google LLC
*
* Use of this source code is governed by an MIT-style
* license that can be found in the LICENSE file or at
* https://opensource.org/licenses/MIT.
* =============================================================================
*/
/**
* Math utility functions.
*
* This file contains some frequently used math function that operates on
* number[] or Float32Array and return a number. Many of these functions are
* not-so-thick wrappers around TF.js Core functions. But they offer the
* convenience of
* 1) not having to convert the inputs into Tensors,
* 2) not having to convert the returned Tensors to numbers.
*/
import { ValueError } from '../errors';
/**
* Determine if a number is an integer.
*/
export function isInteger(x) {
return x === parseInt(x.toString(), 10);
}
/**
* Calculate the product of an array of numbers.
* @param array The array to calculate the product over.
* @param begin Beginning index, inclusive.
* @param end Ending index, exclusive.
* @return The product.
*/
export function arrayProd(array, begin, end) {
if (begin == null) {
begin = 0;
}
if (end == null) {
end = array.length;
}
let prod = 1;
for (let i = begin; i < end; ++i) {
prod *= array[i];
}
return prod;
}
/**
* Compute minimum value.
* @param array
* @return minimum value.
*/
export function min(array) {
// same behavior as tf.min()
if (array.length === 0) {
return Number.NaN;
}
let min = Number.POSITIVE_INFINITY;
for (let i = 0; i < array.length; i++) {
const value = array[i];
if (value < min) {
min = value;
}
}
return min;
}
/**
* Compute maximum value.
* @param array
* @return maximum value
*/
export function max(array) {
// same behavior as tf.max()
if (array.length === 0) {
return Number.NaN;
}
let max = Number.NEGATIVE_INFINITY;
for (let i = 0; i < array.length; i++) {
const value = array[i];
if (value > max) {
max = value;
}
}
return max;
}
/**
* Compute sum of array.
* @param array
* @return The sum.
*/
export function sum(array) {
let sum = 0;
for (let i = 0; i < array.length; i++) {
const value = array[i];
sum += value;
}
return sum;
}
/**
* Compute mean of array.
* @param array
* @return The mean.
*/
export function mean(array) {
return sum(array) / array.length;
}
/**
* Compute variance of array.
* @param array
* @return The variance.
*/
export function variance(array) {
const meanValue = mean(array);
const demeaned = array.map((value) => value - meanValue);
let sumSquare = 0;
for (let i = 0; i < demeaned.length; i++) {
const value = demeaned[i];
sumSquare += value * value;
}
return sumSquare / array.length;
}
/**
* Compute median of array.
* @param array
* @return The median value.
*/
export function median(array) {
const arraySorted = array.slice().sort((a, b) => a - b);
const lowIdx = Math.floor((arraySorted.length - 1) / 2);
const highIdx = Math.ceil((arraySorted.length - 1) / 2);
if (lowIdx === highIdx) {
return arraySorted[lowIdx];
}
return (arraySorted[lowIdx] + arraySorted[highIdx]) / 2;
}
/**
* Generate an array of integers in [begin, end).
* @param begin Beginning integer, inclusive.
* @param end Ending integer, exclusive.
* @returns Range array.
* @throws ValueError, iff `end` < `begin`.
*/
export function range(begin, end) {
if (end < begin) {
throw new ValueError(`end (${end}) < begin (${begin}) is forbidden.`);
}
const out = [];
for (let i = begin; i < end; ++i) {
out.push(i);
}
return out;
}
//# sourceMappingURL=data:application/json;base64,{"version":3,"file":"math_utils.js","sourceRoot":"","sources":["../../../../../../tfjs-layers/src/utils/math_utils.ts"],"names":[],"mappings":"AAAA;;;;;;;;GAQG;AAEH;;;;;;;;;GASG;AAEH,OAAO,EAAC,UAAU,EAAC,MAAM,WAAW,CAAC;AAIrC;;GAEG;AACH,MAAM,UAAU,SAAS,CAAC,CAAS;IACjC,OAAO,CAAC,KAAK,QAAQ,CAAC,CAAC,CAAC,QAAQ,EAAE,EAAE,EAAE,CAAC,CAAC;AAC1C,CAAC;AAED;;;;;;GAMG;AACH,MAAM,UAAU,SAAS,CACrB,KAA0B,EAAE,KAAc,EAAE,GAAY;IAC1D,IAAI,KAAK,IAAI,IAAI,EAAE;QACjB,KAAK,GAAG,CAAC,CAAC;KACX;IACD,IAAI,GAAG,IAAI,IAAI,EAAE;QACf,GAAG,GAAG,KAAK,CAAC,MAAM,CAAC;KACpB;IAED,IAAI,IAAI,GAAG,CAAC,CAAC;IACb,KAAK,IAAI,CAAC,GAAG,KAAK,EAAE,CAAC,GAAG,GAAG,EAAE,EAAE,CAAC,EAAE;QAChC,IAAI,IAAI,KAAK,CAAC,CAAC,CAAC,CAAC;KAClB;IACD,OAAO,IAAI,CAAC;AACd,CAAC;AAED;;;;GAIG;AACH,MAAM,UAAU,GAAG,CAAC,KAA4B;IAC9C,4BAA4B;IAC5B,IAAI,KAAK,CAAC,MAAM,KAAK,CAAC,EAAE;QACtB,OAAO,MAAM,CAAC,GAAG,CAAC;KACnB;IACD,IAAI,GAAG,GAAG,MAAM,CAAC,iBAAiB,CAAC;IACnC,KAAK,IAAI,CAAC,GAAG,CAAC,EAAE,CAAC,GAAG,KAAK,CAAC,MAAM,EAAE,CAAC,EAAE,EAAE;QACrC,MAAM,KAAK,GAAG,KAAK,CAAC,CAAC,CAAC,CAAC;QACvB,IAAI,KAAK,GAAG,GAAG,EAAE;YACf,GAAG,GAAG,KAAK,CAAC;SACb;KACF;IACD,OAAO,GAAG,CAAC;AACb,CAAC;AAED;;;;GAIG;AACH,MAAM,UAAU,GAAG,CAAC,KAA4B;IAC9C,4BAA4B;IAC5B,IAAI,KAAK,CAAC,MAAM,KAAK,CAAC,EAAE;QACtB,OAAO,MAAM,CAAC,GAAG,CAAC;KACnB;IACD,IAAI,GAAG,GAAG,MAAM,CAAC,iBAAiB,CAAC;IACnC,KAAK,IAAI,CAAC,GAAG,CAAC,EAAE,CAAC,GAAG,KAAK,CAAC,MAAM,EAAE,CAAC,EAAE,EAAE;QACrC,MAAM,KAAK,GAAG,KAAK,CAAC,CAAC,CAAC,CAAC;QACvB,IAAI,KAAK,GAAG,GAAG,EAAE;YACf,GAAG,GAAG,KAAK,CAAC;SACb;KACF;IACD,OAAO,GAAG,CAAC;AACb,CAAC;AAED;;;;GAIG;AACH,MAAM,UAAU,GAAG,CAAC,KAA4B;IAC9C,IAAI,GAAG,GAAG,CAAC,CAAC;IACZ,KAAK,IAAI,CAAC,GAAG,CAAC,EAAE,CAAC,GAAG,KAAK,CAAC,MAAM,EAAE,CAAC,EAAE,EAAE;QACrC,MAAM,KAAK,GAAG,KAAK,CAAC,CAAC,CAAC,CAAC;QACvB,GAAG,IAAI,KAAK,CAAC;KACd;IACD,OAAO,GAAG,CAAC;AACb,CAAC;AAED;;;;GAIG;AACH,MAAM,UAAU,IAAI,CAAC,KAA4B;IAC/C,OAAO,GAAG,CAAC,KAAK,CAAC,GAAG,KAAK,CAAC,MAAM,CAAC;AACnC,CAAC;AAED;;;;GAIG;AACH,MAAM,UAAU,QAAQ,CAAC,KAA4B;IACnD,MAAM,SAAS,GAAG,IAAI,CAAC,KAAK,CAAC,CAAC;IAC9B,MAAM,QAAQ,GAAG,KAAK,CAAC,GAAG,CAAC,CAAC,KAAa,EAAE,EAAE,CAAC,KAAK,GAAG,SAAS,CAAC,CAAC;IACjE,IAAI,SAAS,GAAG,CAAC,CAAC;IAClB,KAAK,IAAI,CAAC,GAAG,CAAC,EAAE,CAAC,GAAG,QAAQ,CAAC,MAAM,EAAE,CAAC,EAAE,EAAE;QACxC,MAAM,KAAK,GAAG,QAAQ,CAAC,CAAC,CAAC,CAAC;QAC1B,SAAS,IAAI,KAAK,GAAG,KAAK,CAAC;KAC5B;IACD,OAAO,SAAS,GAAG,KAAK,CAAC,MAAM,CAAC;AAClC,CAAC;AAED;;;;GAIG;AACH,MAAM,UAAU,MAAM,CAAC,KAA4B;IACjD,MAAM,WAAW,GAAG,KAAK,CAAC,KAAK,EAAE,CAAC,IAAI,CAAC,CAAC,CAAC,EAAE,CAAC,EAAE,EAAE,CAAC,CAAC,GAAG,CAAC,CAAC,CAAC;IACxD,MAAM,MAAM,GAAG,IAAI,CAAC,KAAK,CAAC,CAAC,WAAW,CAAC,MAAM,GAAG,CAAC,CAAC,GAAG,CAAC,CAAC,CAAC;IACxD,MAAM,OAAO,GAAG,IAAI,CAAC,IAAI,CAAC,CAAC,WAAW,CAAC,MAAM,GAAG,CAAC,CAAC,GAAG,CAAC,CAAC,CAAC;IACxD,IAAI,MAAM,KAAK,OAAO,EAAE;QACtB,OAAO,WAAW,CAAC,MAAM,CAAC,CAAC;KAC5B;IACD,OAAO,CAAC,WAAW,CAAC,MAAM,CAAC,GAAG,WAAW,CAAC,OAAO,CAAC,CAAC,GAAG,CAAC,CAAC;AAC1D,CAAC;AAED;;;;;;GAMG;AACH,MAAM,UAAU,KAAK,CAAC,KAAa,EAAE,GAAW;IAC9C,IAAI,GAAG,GAAG,KAAK,EAAE;QACf,MAAM,IAAI,UAAU,CAAC,QAAQ,GAAG,cAAc,KAAK,iBAAiB,CAAC,CAAC;KACvE;IACD,MAAM,GAAG,GAAa,EAAE,CAAC;IACzB,KAAK,IAAI,CAAC,GAAG,KAAK,EAAE,CAAC,GAAG,GAAG,EAAE,EAAE,CAAC,EAAE;QAChC,GAAG,CAAC,IAAI,CAAC,CAAC,CAAC,CAAC;KACb;IACD,OAAO,GAAG,CAAC;AACb,CAAC","sourcesContent":["/**\n * @license\n * Copyright 2018 Google LLC\n *\n * Use of this source code is governed by an MIT-style\n * license that can be found in the LICENSE file or at\n * https://opensource.org/licenses/MIT.\n * =============================================================================\n */\n\n/**\n * Math utility functions.\n *\n * This file contains some frequently used math function that operates on\n * number[] or Float32Array and return a number. Many of these functions are\n * not-so-thick wrappers around TF.js Core functions. But they offer the\n * convenience of\n * 1) not having to convert the inputs into Tensors,\n * 2) not having to convert the returned Tensors to numbers.\n */\n\nimport {ValueError} from '../errors';\n\nexport type ArrayTypes = Uint8Array|Int32Array|Float32Array;\n\n/**\n * Determine if a number is an integer.\n */\nexport function isInteger(x: number): boolean {\n  return x === parseInt(x.toString(), 10);\n}\n\n/**\n * Calculate the product of an array of numbers.\n * @param array The array to calculate the product over.\n * @param begin Beginning index, inclusive.\n * @param end Ending index, exclusive.\n * @return The product.\n */\nexport function arrayProd(\n    array: number[]|ArrayTypes, begin?: number, end?: number): number {\n  if (begin == null) {\n    begin = 0;\n  }\n  if (end == null) {\n    end = array.length;\n  }\n\n  let prod = 1;\n  for (let i = begin; i < end; ++i) {\n    prod *= array[i];\n  }\n  return prod;\n}\n\n/**\n * Compute minimum value.\n * @param array\n * @return minimum value.\n */\nexport function min(array: number[]|Float32Array): number {\n  // same behavior as tf.min()\n  if (array.length === 0) {\n    return Number.NaN;\n  }\n  let min = Number.POSITIVE_INFINITY;\n  for (let i = 0; i < array.length; i++) {\n    const value = array[i];\n    if (value < min) {\n      min = value;\n    }\n  }\n  return min;\n}\n\n/**\n * Compute maximum value.\n * @param array\n * @return maximum value\n */\nexport function max(array: number[]|Float32Array): number {\n  // same behavior as tf.max()\n  if (array.length === 0) {\n    return Number.NaN;\n  }\n  let max = Number.NEGATIVE_INFINITY;\n  for (let i = 0; i < array.length; i++) {\n    const value = array[i];\n    if (value > max) {\n      max = value;\n    }\n  }\n  return max;\n}\n\n/**\n * Compute sum of array.\n * @param array\n * @return The sum.\n */\nexport function sum(array: number[]|Float32Array): number {\n  let sum = 0;\n  for (let i = 0; i < array.length; i++) {\n    const value = array[i];\n    sum += value;\n  }\n  return sum;\n}\n\n/**\n * Compute mean of array.\n * @param array\n * @return The mean.\n */\nexport function mean(array: number[]|Float32Array): number {\n  return sum(array) / array.length;\n}\n\n/**\n * Compute variance of array.\n * @param array\n * @return The variance.\n */\nexport function variance(array: number[]|Float32Array): number {\n  const meanValue = mean(array);\n  const demeaned = array.map((value: number) => value - meanValue);\n  let sumSquare = 0;\n  for (let i = 0; i < demeaned.length; i++) {\n    const value = demeaned[i];\n    sumSquare += value * value;\n  }\n  return sumSquare / array.length;\n}\n\n/**\n * Compute median of array.\n * @param array\n * @return The median value.\n */\nexport function median(array: number[]|Float32Array): number {\n  const arraySorted = array.slice().sort((a, b) => a - b);\n  const lowIdx = Math.floor((arraySorted.length - 1) / 2);\n  const highIdx = Math.ceil((arraySorted.length - 1) / 2);\n  if (lowIdx === highIdx) {\n    return arraySorted[lowIdx];\n  }\n  return (arraySorted[lowIdx] + arraySorted[highIdx]) / 2;\n}\n\n/**\n * Generate an array of integers in [begin, end).\n * @param begin Beginning integer, inclusive.\n * @param end Ending integer, exclusive.\n * @returns Range array.\n * @throws ValueError, iff `end` < `begin`.\n */\nexport function range(begin: number, end: number): number[] {\n  if (end < begin) {\n    throw new ValueError(`end (${end}) < begin (${begin}) is forbidden.`);\n  }\n  const out: number[] = [];\n  for (let i = begin; i < end; ++i) {\n    out.push(i);\n  }\n  return out;\n}\n"]}