@tensorflow/tfjs-core
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Hardware-accelerated JavaScript library for machine intelligence
114 lines • 4.11 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
var util = require("../util");
function assertParamsValid(input, begin, size) {
util.assert(input.rank === begin.length, "Error in slice" + input.rank + "D: Length of begin " + begin + " must " +
("match the rank of the array (" + input.rank + ")."));
util.assert(input.rank === size.length, "Error in slice" + input.rank + "D: Length of size " + size + " must " +
("match the rank of the array (" + input.rank + ")."));
for (var i = 0; i < input.rank; ++i) {
util.assert(begin[i] + size[i] <= input.shape[i], "Error in slice" + input.rank + "D: begin[" + i + "] + size[" + i + "] " +
("(" + (begin[i] + size[i]) + ") would overflow input.shape[" + i + "] (" + input.shape[i] + ")"));
}
}
exports.assertParamsValid = assertParamsValid;
function getStridedSlicedInfo(shape, begin, end, strides, beginMask, endMask, ellipsisMask, newAxisMask, shrinkAxisMask) {
if (beginMask === void 0) { beginMask = 0; }
if (endMask === void 0) { endMask = 0; }
if (ellipsisMask === void 0) { ellipsisMask = 0; }
if (newAxisMask === void 0) { newAxisMask = 0; }
if (shrinkAxisMask === void 0) { shrinkAxisMask = 0; }
if (ellipsisMask !== 0) {
throw new Error('ellipsis mask is not yet supported');
}
if (newAxisMask !== 0) {
throw new Error('new axis mask is not yet supported');
}
var startIndex = [];
var endIndex = [];
var shrinkAxis = [];
for (var i = 0; i < shape.length; i++) {
startIndex[i] = startForAxis(beginMask, begin, strides, shape, i);
endIndex[i] = stopForAxis(endMask, end, strides, shape, i);
if (shrinkAxisMask & 1 << i) {
endIndex[i] = startIndex[i] + 1;
shrinkAxis.push(i);
}
}
var size = new Array(shape.length).fill(0);
size = size.map(function (d, i) {
var count = 0;
for (var start = startIndex[i]; !(strides[i] > 0 ? start >= endIndex[i] : start <= endIndex[i]); start += strides[i]) {
count += 1;
}
return count;
});
return [startIndex, size, shrinkAxis];
}
exports.getStridedSlicedInfo = getStridedSlicedInfo;
function startForAxis(beginMask, startIndices, strides, inputShape, axis) {
var start = startIndices[axis];
if (beginMask & 1 << axis) {
if (strides[axis] > 0) {
start = Number.MIN_SAFE_INTEGER;
}
else {
start = Number.MAX_SAFE_INTEGER;
}
}
var axisSize = inputShape[axis];
if (start < 0) {
start += axisSize;
}
start = util.clamp(0, start, axisSize - 1);
return start;
}
exports.startForAxis = startForAxis;
function stopForAxis(endMask, stopIndices, strides, inputShape, axis) {
var stop = stopIndices[axis];
if (endMask & (1 << axis)) {
if (strides[axis] > 0) {
stop = Number.MAX_SAFE_INTEGER;
}
else {
stop = Number.MIN_SAFE_INTEGER;
}
}
var axisSize = inputShape[axis];
if (stop < 0) {
stop += axisSize;
}
if (strides[axis] > 0) {
stop = util.clamp(0, stop, axisSize);
}
else {
stop = util.clamp(-1, stop, axisSize - 1);
}
return stop;
}
exports.stopForAxis = stopForAxis;
function isSliceContinous(shape, begin, size) {
var firstNonOneAxis = size.length;
for (var i = 0; i < size.length; i++) {
if (size[i] > 1) {
firstNonOneAxis = i;
break;
}
}
for (var i = firstNonOneAxis + 1; i < size.length; i++) {
if (begin[i] > 0 || size[i] !== shape[i]) {
return false;
}
}
return true;
}
exports.isSliceContinous = isSliceContinous;
function computeFlatOffset(begin, strides) {
var flatOffset = begin.length > 0 ? begin[begin.length - 1] : 1;
for (var i = 0; i < begin.length - 1; i++) {
flatOffset += begin[i] * strides[i];
}
return flatOffset;
}
exports.computeFlatOffset = computeFlatOffset;
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