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@tensorflow/tfjs-layers

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TensorFlow layers API in JavaScript

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/** * @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. * ============================================================================= */ /** * Built-in metrics. */ import * as tfc from '@tensorflow/tfjs-core'; import { tidy } from '@tensorflow/tfjs-core'; import * as K from './backend/tfjs_backend'; import { NotImplementedError, ValueError } from './errors'; import { binaryCrossentropy as lossBinaryCrossentropy, categoricalCrossentropy as categoricalCrossentropyLoss, cosineProximity, lossesMap, meanAbsoluteError, meanAbsolutePercentageError, meanSquaredError, sparseCategoricalCrossentropy as sparseCategoricalCrossentropyLoss } from './losses'; import * as util from './utils/generic_utils'; export function binaryAccuracy(yTrue, yPred) { return tidy(() => { const threshold = tfc.mul(.5, tfc.onesLike(yPred)); const yPredThresholded = K.cast(tfc.greater(yPred, threshold), yTrue.dtype); return tfc.mean(tfc.equal(yTrue, yPredThresholded), -1); }); } export function categoricalAccuracy(yTrue, yPred) { return tidy(() => K.cast(tfc.equal(tfc.argMax(yTrue, -1), tfc.argMax(yPred, -1)), 'float32')); } function truePositives(yTrue, yPred) { return tidy(() => { return tfc.cast(tfc.sum(tfc.logicalAnd(tfc.equal(yTrue, 1), tfc.equal(yPred, 1))), 'float32'); }); } function falseNegatives(yTrue, yPred) { return tidy(() => { return tfc.cast(tfc.sum(tfc.logicalAnd(tfc.equal(yTrue, 1), tfc.equal(yPred, 0))), 'float32'); }); } function falsePositives(yTrue, yPred) { return tidy(() => { return tfc.cast(tfc.sum(tfc.logicalAnd(tfc.equal(yTrue, 0), tfc.equal(yPred, 1))), 'float32'); }); } export function precision(yTrue, yPred) { return tidy(() => { const tp = truePositives(yTrue, yPred); const fp = falsePositives(yTrue, yPred); const denominator = tfc.add(tp, fp); return tfc.cast(tfc.where(tfc.greater(denominator, 0), tfc.div(tp, denominator), 0), 'float32'); }); } export function recall(yTrue, yPred) { return tidy(() => { const tp = truePositives(yTrue, yPred); const fn = falseNegatives(yTrue, yPred); const denominator = tfc.add(tp, fn); return tfc.cast(tfc.where(tfc.greater(denominator, 0), tfc.div(tp, denominator), 0), 'float32'); }); } export function binaryCrossentropy(yTrue, yPred) { return lossBinaryCrossentropy(yTrue, yPred); } export function sparseCategoricalAccuracy(yTrue, yPred) { if (yTrue.rank === yPred.rank) { yTrue = tfc.squeeze(yTrue, [yTrue.rank - 1]); } yPred = tfc.argMax(yPred, -1); if (yPred.dtype !== yTrue.dtype) { yPred = tfc.cast(yPred, yTrue.dtype); } return tfc.cast(tfc.equal(yTrue, yPred), 'float32'); } export function topKCategoricalAccuracy(yTrue, yPred) { throw new NotImplementedError(); } export function sparseTopKCategoricalAccuracy(yTrue, yPred) { throw new NotImplementedError(); } export function r2Score(yTrue, yPred) { return tidy(() => { const sumSquaresResiduals = yTrue.sub(yPred).square().sum(); const sumSquares = yTrue.sub(yTrue.mean()).square().sum(); return tfc.scalar(1).sub(sumSquaresResiduals.div(sumSquares)); }); } // Aliases. export const mse = meanSquaredError; export const MSE = meanSquaredError; export const mae = meanAbsoluteError; export const MAE = meanAbsoluteError; export const mape = meanAbsolutePercentageError; export const MAPE = meanAbsolutePercentageError; export const categoricalCrossentropy = categoricalCrossentropyLoss; export const cosine = cosineProximity; export const sparseCategoricalCrossentropy = sparseCategoricalCrossentropyLoss; // TODO(cais, nielsene): Add serialize(). export const metricsMap = { binaryAccuracy, categoricalAccuracy, precision, categoricalCrossentropy, sparseCategoricalCrossentropy, mse, MSE, mae, MAE, mape, MAPE, cosine }; export function get(identifier) { if (typeof identifier === 'string' && identifier in metricsMap) { return metricsMap[identifier]; } else if (typeof identifier !== 'string' && identifier != null) { return identifier; } else { throw new ValueError(`Unknown metric ${identifier}`); } } /** * Get the shortcut function name. * * If the fn name is a string, * directly return the string name. * If the function is included in metricsMap or lossesMap, * return key of the map. * - If the function relative to multiple keys, * return the first found key as the function name. * - If the function exists in both lossesMap and metricsMap, * search lossesMap first. * If the function is not included in metricsMap or lossesMap, * return the function name. * * @param fn loss function, metric function, or short cut name. * @returns Loss or Metric name in string. */ export function getLossOrMetricName(fn) { util.assert(fn !== null, `Unknown LossOrMetricFn ${fn}`); if (typeof fn === 'string') { return fn; } else { let fnName; for (const key of Object.keys(lossesMap)) { if (lossesMap[key] === fn) { fnName = key; break; } } if (fnName !== undefined) { return fnName; } for (const key of Object.keys(metricsMap)) { if (metricsMap[key] === fn) { fnName = key; break; } } if (fnName !== undefined) { return fnName; } return fn.name; } } //# 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* @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 * Built-in metrics.\n */\n\nimport * as tfc from '@tensorflow/tfjs-core';\nimport {Tensor, tidy} from '@tensorflow/tfjs-core';\n\nimport * as K from './backend/tfjs_backend';\nimport {NotImplementedError, ValueError} from './errors';\nimport {binaryCrossentropy as lossBinaryCrossentropy, categoricalCrossentropy as categoricalCrossentropyLoss, cosineProximity, lossesMap, meanAbsoluteError, meanAbsolutePercentageError, meanSquaredError, sparseCategoricalCrossentropy as sparseCategoricalCrossentropyLoss} from './losses';\nimport {LossOrMetricFn} from './types';\nimport * as util from './utils/generic_utils';\n\nexport function binaryAccuracy(yTrue: Tensor, yPred: Tensor): Tensor {\n  return tidy(() => {\n    const threshold = tfc.mul(.5, tfc.onesLike(yPred));\n    const yPredThresholded = K.cast(tfc.greater(yPred, threshold), yTrue.dtype);\n    return tfc.mean(tfc.equal(yTrue, yPredThresholded), -1);\n  });\n}\n\nexport function categoricalAccuracy(yTrue: Tensor, yPred: Tensor): Tensor {\n  return tidy(\n      () => K.cast(\n          tfc.equal(tfc.argMax(yTrue, -1), tfc.argMax(yPred, -1)), 'float32'));\n}\n\nfunction truePositives(yTrue: Tensor, yPred: Tensor): Tensor {\n  return tidy(() => {\n    return tfc.cast(\n        tfc.sum(tfc.logicalAnd(tfc.equal(yTrue, 1), tfc.equal(yPred, 1))),\n        'float32');\n  });\n}\n\nfunction falseNegatives(yTrue: Tensor, yPred: Tensor): Tensor {\n  return tidy(() => {\n    return tfc.cast(\n        tfc.sum(tfc.logicalAnd(tfc.equal(yTrue, 1), tfc.equal(yPred, 0))),\n        'float32');\n  });\n}\n\nfunction falsePositives(yTrue: Tensor, yPred: Tensor): Tensor {\n  return tidy(() => {\n    return tfc.cast(\n        tfc.sum(tfc.logicalAnd(tfc.equal(yTrue, 0), tfc.equal(yPred, 1))),\n        'float32');\n  });\n}\n\nexport function precision(yTrue: Tensor, yPred: Tensor): Tensor {\n  return tidy(() => {\n    const tp = truePositives(yTrue, yPred);\n    const fp = falsePositives(yTrue, yPred);\n\n    const denominator = tfc.add(tp, fp);\n\n    return tfc.cast(\n        tfc.where(tfc.greater(denominator, 0), tfc.div(tp, denominator), 0),\n        'float32');\n  });\n}\n\nexport function recall(yTrue: Tensor, yPred: Tensor): Tensor {\n  return tidy(() => {\n    const tp = truePositives(yTrue, yPred);\n    const fn = falseNegatives(yTrue, yPred);\n\n    const denominator = tfc.add(tp, fn);\n\n    return tfc.cast(\n        tfc.where(tfc.greater(denominator, 0), tfc.div(tp, denominator), 0),\n        'float32');\n  });\n}\n\nexport function binaryCrossentropy(yTrue: Tensor, yPred: Tensor): Tensor {\n  return lossBinaryCrossentropy(yTrue, yPred);\n}\n\nexport function sparseCategoricalAccuracy(\n    yTrue: Tensor, yPred: Tensor): Tensor {\n  if (yTrue.rank === yPred.rank) {\n    yTrue = tfc.squeeze(yTrue, [yTrue.rank - 1]);\n  }\n  yPred = tfc.argMax(yPred, -1);\n  if (yPred.dtype !== yTrue.dtype) {\n    yPred = tfc.cast(yPred, yTrue.dtype);\n  }\n  return tfc.cast(tfc.equal(yTrue, yPred), 'float32');\n}\n\nexport function topKCategoricalAccuracy(yTrue: Tensor, yPred: Tensor): Tensor {\n  throw new NotImplementedError();\n}\n\nexport function sparseTopKCategoricalAccuracy(\n    yTrue: Tensor, yPred: Tensor): Tensor {\n  throw new NotImplementedError();\n}\n\nexport function r2Score(yTrue: Tensor, yPred: Tensor): Tensor {\n  return tidy(() => {\n    const sumSquaresResiduals = yTrue.sub(yPred).square().sum();\n    const sumSquares = yTrue.sub(yTrue.mean()).square().sum();\n    return tfc.scalar(1).sub(sumSquaresResiduals.div(sumSquares));\n  });\n}\n\n// Aliases.\nexport const mse = meanSquaredError;\nexport const MSE = meanSquaredError;\nexport const mae = meanAbsoluteError;\nexport const MAE = meanAbsoluteError;\nexport const mape = meanAbsolutePercentageError;\nexport const MAPE = meanAbsolutePercentageError;\nexport const categoricalCrossentropy = categoricalCrossentropyLoss;\nexport const cosine = cosineProximity;\nexport const sparseCategoricalCrossentropy = sparseCategoricalCrossentropyLoss;\n\n// TODO(cais, nielsene): Add serialize().\n\nexport const metricsMap: {[functionName: string]: LossOrMetricFn} = {\n  binaryAccuracy,\n  categoricalAccuracy,\n  precision,\n  categoricalCrossentropy,\n  sparseCategoricalCrossentropy,\n  mse,\n  MSE,\n  mae,\n  MAE,\n  mape,\n  MAPE,\n  cosine\n};\n\nexport function get(identifier: string|LossOrMetricFn): LossOrMetricFn {\n  if (typeof identifier === 'string' && identifier in metricsMap) {\n    return metricsMap[identifier];\n  } else if (typeof identifier !== 'string' && identifier != null) {\n    return identifier;\n  } else {\n    throw new ValueError(`Unknown metric ${identifier}`);\n  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