"use strict";
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/**
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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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Object.defineProperty(exports, "__esModule", { value: true });
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var util = require("../util");
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function assertParamsValid(input, begin, size) {
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util.assert(input.rank === begin.length, function () { return "Error in slice" + input.rank + "D: Length of begin " + begin + " must " +
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("match the rank of the array (" + input.rank + ")."); });
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util.assert(input.rank === size.length, function () { return "Error in slice" + input.rank + "D: Length of size " + size + " must " +
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("match the rank of the array (" + input.rank + ")."); });
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var _loop_1 = function (i) {
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util.assert(begin[i] + size[i] <= input.shape[i], function () { return "Error in slice" + input.rank + "D: begin[" + i + "] + size[" + i + "] " +
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("(" + (begin[i] + size[i]) + ") would overflow input.shape[" + i + "] (" + input.shape[i] + ")"); });
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};
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for (var i = 0; i < input.rank; ++i) {
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_loop_1(i);
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}
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}
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exports.assertParamsValid = assertParamsValid;
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/** Converts a binary mask to an array of axes. Used in stridedSlice(). */
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function maskToAxes(mask) {
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var axes = [];
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var axis = 0;
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while (mask > 0) {
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if (mask & 1) {
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axes.push(axis);
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}
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mask /= 2;
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axis++;
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}
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return axes;
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}
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exports.maskToAxes = maskToAxes;
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/** Computes the output shape given the strided slice params. */
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function computeOutShape(begin, end, strides) {
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var size = [];
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for (var axis = 0; axis < begin.length; axis++) {
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size[axis] = Math.ceil((end[axis] - begin[axis]) / strides[axis]);
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}
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return size;
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}
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exports.computeOutShape = computeOutShape;
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function startForAxis(beginMask, startIndices, strides, inputShape, axis) {
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// Begin with the specified index
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var start = startIndices[axis];
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var stride = strides[axis] || 1;
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// Check the axis bit from right of beginMask or the begin index is not set
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// for the axis.
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if (beginMask & 1 << axis || start == null) {
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if (stride > 0) {
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// Forward iteration - use the first element. These values will get
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// clamped below (Note: We could have set them to 0 and axis_size-1, but
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// use lowest() and max() to maintain symmetry with StopForAxis())
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start = Number.MIN_SAFE_INTEGER;
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}
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else {
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// Backward iteration - use the last element.
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start = Number.MAX_SAFE_INTEGER;
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}
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}
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// Handle negative indices
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var axisSize = inputShape[axis];
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if (start < 0) {
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start += axisSize;
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}
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// Clamping
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start = util.clamp(0, start, axisSize - 1);
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return start;
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}
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exports.startForAxis = startForAxis;
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function stopForAxis(endMask, stopIndices, strides, inputShape, axis) {
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// Begin with the specified index
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var stop = stopIndices[axis];
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var stride = strides[axis] || 1;
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// Check the axis bit from right of endMask or if the stop index is not set
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// for this axis.
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if (endMask & (1 << axis) || stop == null) {
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if (stride > 0) {
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// Forward iteration - use the last element. These values will get
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// clamped below
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stop = Number.MAX_SAFE_INTEGER;
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}
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else {
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// Backward iteration - use the first element.
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stop = Number.MIN_SAFE_INTEGER;
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}
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}
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// Handle negative indices
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var axisSize = inputShape[axis];
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if (stop < 0) {
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stop += axisSize;
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}
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// Clamping
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// Because the end index points one past the last element, we need slightly
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// different clamping ranges depending on the direction.
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if (stride > 0) {
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// Forward iteration
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stop = util.clamp(0, stop, axisSize);
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}
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else {
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// Backward iteration
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stop = util.clamp(-1, stop, axisSize - 1);
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}
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return stop;
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}
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exports.stopForAxis = stopForAxis;
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/**
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* Returns true if the slice occupies a continous set of elements in the
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* 'flat' space.
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*/
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function isSliceContinous(shape, begin, size) {
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// Index of the first axis that has size > 1.
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var firstNonOneAxis = size.length;
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for (var i = 0; i < size.length; i++) {
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if (size[i] > 1) {
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firstNonOneAxis = i;
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break;
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}
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}
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for (var i = firstNonOneAxis + 1; i < size.length; i++) {
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if (begin[i] > 0 || size[i] !== shape[i]) {
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return false;
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}
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}
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return true;
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}
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exports.isSliceContinous = isSliceContinous;
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function computeFlatOffset(begin, strides) {
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var flatOffset = begin.length > 0 ? begin[begin.length - 1] : 1;
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for (var i = 0; i < begin.length - 1; i++) {
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flatOffset += begin[i] * strides[i];
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}
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return flatOffset;
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}
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exports.computeFlatOffset = computeFlatOffset;
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//# sourceMappingURL=slice_util.js.map
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