void Im2col(const T* input_data, const Dims<4>& input_dims, int stride,
            int pad_width, int pad_height, int kheight, int kwidth,
            uint8 zero_byte, T* output_data, const Dims<4>& output_dims) {
  Im2col(input_data, input_dims, stride, stride, pad_width, pad_height, kheight,
         kwidth, zero_byte, output_data, output_dims);
}
void Im2col(const T* input_data, const Dims<4>& input_dims, int stride,
            int pad_width, int pad_height, int kheight, int kwidth,
            uint8 zero_byte, T* output_data, const Dims<4>& output_dims) {
  Im2col(input_data, input_dims, stride, stride, pad_width, pad_height, kheight,
         kwidth, zero_byte, output_data, output_dims);
}