cavis/libnd4j/include/ops/declarable/helpers/cpu/im2col.cpp

131 lines
5.5 KiB
C++

/*******************************************************************************
* Copyright (c) 2015-2018 Skymind, Inc.
*
* This program and the accompanying materials are made available under the
* terms of the Apache License, Version 2.0 which is available at
* https://www.apache.org/licenses/LICENSE-2.0.
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations
* under the License.
*
* SPDX-License-Identifier: Apache-2.0
******************************************************************************/
//
// @author Yurii Shyrma (iuriish@yahoo.com), created on 19.09.2018
//
#include <ops/declarable/helpers/im2col.h>
namespace nd4j {
namespace ops {
namespace helpers {
//////////////////////////////////////////////////////////////////////////
template <typename T>
static void im2col_(nd4j::LaunchContext & context, const NDArray& input, NDArray& output, const int kH, const int kW, const int sH, const int sW, const int pH, const int pW, const int dH, const int dW, const NDArray& arrZeroPadVal) {
// input [bS, iC, iH, iW] is convoluted to output [bS, iC, kH, kW, oH, oW]
auto imBuff = static_cast<T*>(input.getBuffer());
auto colBuff = static_cast<T*>(output.getBuffer());
auto imShapeBuffer = input.getShapeInfo();
auto colShapeBuffer = output.getShapeInfo();
auto colShape = shape::shapeOf(colShapeBuffer);
auto colStride = shape::stride(colShapeBuffer);
auto imShape = shape::shapeOf(imShapeBuffer);
auto imStride = shape::stride(imShapeBuffer);
const T zeroPadVal = arrZeroPadVal.e<T>(0);
const int bS = imShape[0];
const int iC = imShape[1];
const int iH = imShape[2];
const int iW = imShape[3];
const int oH = colShape[4];
const int oW = colShape[5];
const Nd4jLong colStride0 = colStride[0];
const Nd4jLong colStride1 = colStride[1];
const Nd4jLong colStride2 = colStride[2];
const Nd4jLong colStride3 = colStride[3];
const Nd4jLong colStride4 = colStride[4];
const Nd4jLong colStride5 = colStride[5];
const Nd4jLong imStride0 = imStride[0];
const Nd4jLong imStride1 = imStride[1];
const Nd4jLong imStride2 = imStride[2];
const Nd4jLong imStride3 = imStride[3];
T *col, *im;
int imRow, imCol;
if (shape::order(imShapeBuffer) == 'c' && shape::order(colShapeBuffer) == 'c' && shape::strideDescendingCAscendingF(imShapeBuffer) && shape::strideDescendingCAscendingF(colShapeBuffer)) {
PRAGMA_OMP_PARALLEL_FOR_SIMD_ARGS(private(col, im, imRow, imCol) collapse(2))
for (int b = 0; b < bS; b++) {
for (int c = 0; c < iC; ++c) {
for (int kRow = 0; kRow < kH; ++kRow) {
for (int kCol = 0; kCol < kW; ++kCol) {
for (int colH = 0; colH < oH; ++colH) {
for (int colW = 0; colW < oW; ++colW) {
imRow = (-pH + kRow * dH) + colH*sH;
imCol = (-pW + kCol * dW) + colW*sW;
col = colBuff + b*colStride0 + c*colStride1 + kRow*colStride2 + kCol*colStride3 + colH*colStride4 + colW*colStride5;
if (static_cast<unsigned>(imRow) >= static_cast<unsigned>(iH) || static_cast<unsigned>(imCol) >= static_cast<unsigned>(iW))
*col = zeroPadVal;
else {
im = imBuff + b*imStride0 + c*imStride1 + imRow*imStride2 + imCol*imStride3;
*col = *im;
}
}
}
}
}
}
}
}
else {
PRAGMA_OMP_PARALLEL_FOR_SIMD_ARGS(private(im, col, imRow, imCol) collapse(2))
for (int b = 0; b < bS; b++) {
for (int colH = 0; colH < oH; ++colH) {
for (int colW = 0; colW < oW; ++colW) {
for (int c = 0; c < iC; ++c) {
for (int kRow = 0; kRow < kH; ++kRow) {
for (int kCol = 0; kCol < kW; ++kCol) {
imRow = (-pH + kRow * dH) + colH*sH;
imCol = (-pW + kCol * dW) + colW*sW;
col = colBuff + b*colStride0 + c*colStride1 + kRow*colStride2 + kCol*colStride3 + colH*colStride4 + colW*colStride5;
if (static_cast<unsigned>(imRow) >= static_cast<unsigned>(iH) || static_cast<unsigned>(imCol) >= static_cast<unsigned>(iW))
*col = zeroPadVal;
else {
im = imBuff + b*imStride0 + c*imStride1 + imRow*imStride2 + imCol*imStride3;
*col = *im;
}
}
}
}
}
}
}
}
}
void im2col(nd4j::LaunchContext & context, const NDArray& im, NDArray& col, const int kH, const int kW, const int sH, const int sW, const int pH, const int pW, const int dH, const int dW, const NDArray& arrZeroPadVal) {
BUILD_SINGLE_SELECTOR(im.dataType(), im2col_, (context, im, col, kH, kW, sH, sW, pH, pW, dH, dW, arrZeroPadVal), FLOAT_TYPES);
}
}
}
}