#include <stdio.h>
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#include <math.h>
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#include <string.h>
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#include "col2im.h"
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void col2im_add_pixel(float *im, int height, int width, int channels,
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int row, int col, int channel, int pad, float val)
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{
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row -= pad;
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col -= pad;
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if (row < 0 || col < 0 ||
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row >= height || col >= width) return;
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im[col + width*(row + height*channel)] += val;
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}
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//This one might be too, can't remember.
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void col2im_cpu(float* data_col,
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int channels, int height, int width,
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int ksize, int stride, int pad, float* data_im)
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{
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int c,h,w;
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int height_col = (height + 2*pad - ksize) / stride + 1;
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int width_col = (width + 2*pad - ksize) / stride + 1;
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int channels_col = channels * ksize * ksize;
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for (c = 0; c < channels_col; ++c) {
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int w_offset = c % ksize;
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int h_offset = (c / ksize) % ksize;
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int c_im = c / ksize / ksize;
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for (h = 0; h < height_col; ++h) {
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for (w = 0; w < width_col; ++w) {
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int im_row = h_offset + h * stride;
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int im_col = w_offset + w * stride;
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int col_index = (c * height_col + h) * width_col + w;
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float val = data_col[col_index];
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col2im_add_pixel(data_im, height, width, channels,
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im_row, im_col, c_im, pad, val);
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}
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}
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}
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}
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// ----------------------------------------
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void caffe_set(const int N, const float alpha, float* Y) {
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if (alpha == 0) {
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memset(Y, 0, sizeof(float) * N); // NOLINT(caffe/alt_fn)
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return;
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}
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int i;
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for (i = 0; i < N; ++i) {
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Y[i] = alpha;
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}
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}
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inline static int is_a_ge_zero_and_a_lt_b(int a, int b) {
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return (unsigned)(a) < (unsigned)(b);
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}
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// https://github.com/BVLC/caffe/blob/master/src/caffe/util/im2col.cpp
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void col2im_cpu_ext(const float* data_col, const int channels,
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const int height, const int width, const int kernel_h, const int kernel_w,
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const int pad_h, const int pad_w,
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const int stride_h, const int stride_w,
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const int dilation_h, const int dilation_w,
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float* data_im)
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{
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caffe_set(height * width * channels, 0.0F, data_im);
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const int output_h = (height + 2 * pad_h -
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(dilation_h * (kernel_h - 1) + 1)) / stride_h + 1;
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const int output_w = (width + 2 * pad_w -
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(dilation_w * (kernel_w - 1) + 1)) / stride_w + 1;
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const int channel_size = height * width;
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int channel, kernel_row, kernel_col, output_rows, output_col;
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for (channel = channels; channel--; data_im += channel_size) {
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for (kernel_row = 0; kernel_row < kernel_h; kernel_row++) {
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for (kernel_col = 0; kernel_col < kernel_w; kernel_col++) {
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int input_row = -pad_h + kernel_row * dilation_h;
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for (output_rows = output_h; output_rows; output_rows--) {
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if (!is_a_ge_zero_and_a_lt_b(input_row, height)) {
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data_col += output_w;
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}
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else {
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int input_col = -pad_w + kernel_col * dilation_w;
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for (output_col = output_w; output_col; output_col--) {
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if (is_a_ge_zero_and_a_lt_b(input_col, width)) {
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data_im[input_row * width + input_col] += *data_col;
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}
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data_col++;
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input_col += stride_w;
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}
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}
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input_row += stride_h;
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}
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}
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}
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}
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}
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