inline void col2im_set_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 + channel*height)] = 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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const int batch, const int channels, const int height, const int width,
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const int ksize, const int stride, int pad, float* data_im)
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{
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int c,h,w,b;
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int height_col = (height - ksize) / stride + 1;
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int width_col = (width - ksize) / stride + 1;
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if (pad){
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height_col = 1 + (height-1) / stride;
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width_col = 1 + (width-1) / stride;
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pad = ksize/2;
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}
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int channels_col = channels * ksize * ksize;
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int im_size = height*width*channels;
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int col_size = height_col*width_col*channels_col;
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for (b = 0; b < batch; ++b) {
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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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double val = data_col[(c * height_col + h) * width_col + w];
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col2im_set_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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data_im += im_size;
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data_col+= col_size;
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}
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}
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