| 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 * as util from '../util';
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| 18 | /**
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| 19 | * Returns true if the axis specifies the inner most dimensions of the
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| 20 | * array.
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| 21 | */
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| 22 | export function axesAreInnerMostDims(axes, rank) {
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| 23 | for (let i = 0; i < axes.length; ++i) {
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| 24 | if (axes[axes.length - i - 1] !== rank - 1 - i) {
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| 25 | return false;
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| 26 | }
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| 27 | }
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| 28 | return true;
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| 29 | }
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| 30 | export function combineLocations(outputLoc, reduceLoc, axes) {
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| 31 | const rank = outputLoc.length + reduceLoc.length;
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| 32 | const loc = [];
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| 33 | let outIdx = 0;
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| 34 | let reduceIdx = 0;
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| 35 | for (let dim = 0; dim < rank; dim++) {
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| 36 | if (axes.indexOf(dim) === -1) {
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| 37 | loc.push(outputLoc[outIdx++]);
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| 38 | }
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| 39 | else {
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| 40 | loc.push(reduceLoc[reduceIdx++]);
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| 41 | }
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| 42 | }
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| 43 | return loc;
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| 44 | }
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| 45 | export function computeOutAndReduceShapes(aShape, axes) {
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| 46 | const outShape = [];
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| 47 | const rank = aShape.length;
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| 48 | for (let dim = 0; dim < rank; dim++) {
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| 49 | if (axes.indexOf(dim) === -1) {
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| 50 | outShape.push(aShape[dim]);
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| 51 | }
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| 52 | }
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| 53 | const reduceShape = axes.map(dim => aShape[dim]);
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| 54 | return [outShape, reduceShape];
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| 55 | }
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| 56 | export function expandShapeToKeepDim(shape, axes) {
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| 57 | const reduceSubShape = axes.map(x => 1);
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| 58 | return combineLocations(shape, reduceSubShape, axes);
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| 59 | }
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| 60 | export function assertAxesAreInnerMostDims(msg, axes, rank) {
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| 61 | util.assert(axesAreInnerMostDims(axes, rank), () => `${msg} supports only inner-most axes for now. ` +
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| 62 | `Got axes ${axes} and rank-${rank} input.`);
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| 63 | }
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| 64 | /**
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| 65 | * Returns the axes permutation to be used with `tf.transpose`, if such
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| 66 | * permutation is necessary. Otherwise it returns null. This method is used by
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| 67 | * operations that operate only on inner-most axes.
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| 68 | */
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| 69 | export function getAxesPermutation(axes, rank) {
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| 70 | if (axesAreInnerMostDims(axes, rank)) {
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| 71 | return null;
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| 72 | }
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| 73 | const result = [];
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| 74 | for (let i = 0; i < rank; ++i) {
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| 75 | if (axes.indexOf(i) === -1) {
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| 76 | result.push(i);
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| 77 | }
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| 78 | }
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| 79 | axes.forEach(axis => result.push(axis));
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| 80 | return result;
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| 81 | }
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| 82 | /** Returns the axes permutation that undoes the original permutation. */
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| 83 | export function getUndoAxesPermutation(axes) {
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| 84 | return axes.map((axis, i) => [i, axis])
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| 85 | .sort((a, b) => a[1] - b[1])
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| 86 | .map(x => x[0]);
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| 87 | }
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| 88 | export function getInnerMostAxes(numAxes, rank) {
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| 89 | const res = [];
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| 90 | for (let i = rank - numAxes; i < rank; ++i) {
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| 91 | res.push(i);
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| 92 | }
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| 93 | return res;
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| 94 | }
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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 * as util from '../util';\n\n/**\n * Returns true if the axis specifies the inner most dimensions of the\n * array.\n */\nexport function axesAreInnerMostDims(axes: number[], rank: number): boolean {\n  for (let i = 0; i < axes.length; ++i) {\n    if (axes[axes.length - i - 1] !== rank - 1 - i) {\n      return false;\n    }\n  }\n  return true;\n}\n\nexport function combineLocations(\n    outputLoc: number[], reduceLoc: number[], axes: number[]): number[] {\n  const rank = outputLoc.length + reduceLoc.length;\n  const loc = [];\n  let outIdx = 0;\n  let reduceIdx = 0;\n    for (let dim = 0; dim < rank; dim++) {\n    if (axes.indexOf(dim) === -1) {\n      loc.push(outputLoc[outIdx++]);\n    } else {\n      loc.push(reduceLoc[reduceIdx++]);\n    }\n  }\n  return loc;\n}\n\nexport function computeOutAndReduceShapes(\n    aShape: number[], axes: number[]): [number[], number[]] {\n  const outShape = [];\n  const rank = aShape.length;\n  for (let dim = 0; dim < rank; dim++) {\n    if (axes.indexOf(dim) === -1) {\n      outShape.push(aShape[dim]);\n    }\n  }\n  const reduceShape = axes.map(dim => aShape[dim]);\n  return [outShape, reduceShape];\n}\n\nexport function expandShapeToKeepDim(\n    shape: number[], axes: number[]): number[] {\n  const reduceSubShape = axes.map(x => 1);\n  return combineLocations(shape, reduceSubShape, axes);\n}\n\nexport function assertAxesAreInnerMostDims(\n    msg: string, axes: number[], rank: number): void {\n  util.assert(\n      axesAreInnerMostDims(axes, rank),\n      () => `${msg} supports only inner-most axes for now. ` +\n          `Got axes ${axes} and rank-${rank} input.`);\n}\n\n/**\n * Returns the axes permutation to be used with `tf.transpose`, if such\n * permutation is necessary. Otherwise it returns null. This method is used by\n * operations that operate only on inner-most axes.\n */\nexport function getAxesPermutation(axes: number[], rank: number): number[]|\n    null {\n  if (axesAreInnerMostDims(axes, rank)) {\n    return null;\n  }\n  const result: number[] = [];\n  for (let i = 0; i < rank; ++i) {\n    if (axes.indexOf(i) === -1) {\n      result.push(i);\n    }\n  }\n  axes.forEach(axis => result.push(axis));\n  return result;\n}\n\n/** Returns the axes permutation that undoes the original permutation. */\nexport function getUndoAxesPermutation(axes: number[]): number[] {\n  return axes.map((axis, i) => [i, axis])\n      .sort((a, b) => a[1] - b[1])\n      .map(x => x[0]);\n}\n\nexport function getInnerMostAxes(numAxes: number, rank: number): number[] {\n  const res: number[] = [];\n  for (let i = rank - numAxes; i < rank; ++i) {\n    res.push(i);\n  }\n  return res;\n}\n"]} |
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