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__kernel void im2col(__global float *data_im,
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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, __global float *data_col)
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{
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int b = get_global_id(0);
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int c = get_global_id(1);
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int h = get_local_id(0);
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int w = get_local_id(1);
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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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int channels_col = channels * ksize * ksize;
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int im_offset = height*width*channels*b;
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int col_offset = height_col*width_col*channels_col*b;
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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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data_col[(c * height_col + h) * width_col + w + col_offset] =
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data_im[(c_im * height + h * stride + h_offset) * width
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+ w * stride + w_offset + im_offset];
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}
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