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#ifndef __OPENCL_VERSION__
#include "header.cl"
#endif
__kernel void TEMPLATE(im2col_nd, Dtype)(const int_tp n, const int_tp num_axes,
const int_tp channel_axis,
__global const Dtype* data_im,
const int_tp data_im_off,
__global const int_tp* im_shape,
__global const int_tp* col_shape,
__global const int_tp* kernel_shape,
__global const int_tp* pad,
__global const int_tp* stride,
__global const int_tp* dilation,
__global Dtype* data_col,
const int_tp data_col_off) {
int_tp d_temp[6];
int_tp d_iter[6];
int_tp i;
__global const int_tp* im_shape_ptr = im_shape + channel_axis;
__global const int_tp* col_shape_ptr = col_shape + channel_axis;
__local int_tp shared_dilation[6];
__local int_tp shared_kernel_shape[6];
__local int_tp shared_pad[6];
__local int_tp shared_stride[6];
__local int_tp shared_col_shape[6 + 1];
__local int_tp shared_im_shape[6 + 1];
for (int li = get_local_id(0); li < num_axes; li += get_local_size(0)) {
shared_dilation[li] = dilation[li];
shared_kernel_shape[li] = kernel_shape[li];
shared_pad[li] = pad[li];
shared_stride[li] = stride[li];
}
for (int li = get_local_id(0); li < num_axes + 1; li += get_local_size(0)) {
shared_col_shape[li] = col_shape_ptr[li];
shared_im_shape[li] = im_shape_ptr[li];
}
barrier(CLK_LOCAL_MEM_FENCE);
for (int_tp index = get_global_id(0); index < n;
index += get_global_size(0)) {
// Initialize channel_in, computed in the loop below, with intermediate
// computations used to compute the spatial indices.
int_tp channel_in = index;
int_tp channel_out = 1;
for (i = num_axes - 1; i >= 0; --i) {
d_temp[i] = channel_in % shared_col_shape[i + 1];
channel_in /= shared_col_shape[i + 1];
channel_out *= shared_kernel_shape[i];
}
channel_out *= channel_in;
int_tp data_col_inc = 1;
for (i = 0; i < num_axes; ++i) {
channel_out *= shared_col_shape[i + 1];
channel_out += d_temp[i];
d_temp[i] = d_temp[i] * shared_stride[i] - shared_pad[i];
channel_in *= shared_im_shape[i + 1];
channel_in += d_temp[i];
data_col_inc *= shared_col_shape[i + 1];
d_iter[i] = 0;
}
__global Dtype* data_col_ptr = data_col + data_col_off + channel_out;
__global const Dtype* data_im_ptr = data_im + data_im_off + channel_in;
bool incremented;
do {
bool in_range = true;
for (i = 0; i < num_axes; ++i) {
const int_tp d_iter_im = d_iter[i] * shared_dilation[i] + d_temp[i];
in_range &= d_iter_im >= 0 && d_iter_im < shared_im_shape[i + 1];
if (!in_range) {
break;
}
}
if (in_range) {
int_tp data_im_offset = d_iter[0] * shared_dilation[0];
for (i = 1; i < num_axes; ++i) {
data_im_offset *= shared_im_shape[i + 1];
data_im_offset += d_iter[i] * shared_dilation[i];
}
*data_col_ptr = data_im_ptr[data_im_offset];
} else {
*data_col_ptr = 0;
}
data_col_ptr += data_col_inc;
incremented = false;
for (i = num_axes - 1; i >= 0; --i) {
const int_tp d_max = shared_kernel_shape[i];
if (d_iter[i] == d_max - 1) {
d_iter[i] = 0;
} else { // d_iter[i] < d_max - 1
++d_iter[i];
incremented = true;
break;
}
} // for (int_tp i = num_axes - 1; i >= 0; --i)
} while (incremented); // do
}
}
__kernel void TEMPLATE(col2im_nd, Dtype)(const int_tp n, const int_tp num_axes,
const int_tp channel_axis,
__global const Dtype* data_col,
const int_tp data_col_off,
__global const int_tp* im_shape,
__global const int_tp* col_shape,
__global const int_tp* kernel_shape,
__global const int_tp* pad,
__global const int_tp* stride,
__global const int_tp* dilation,
__global Dtype* data_im,
const int_tp data_im_off) {
int_tp d_im[6];
int_tp d_col_iter[6];
int_tp d_col_start[6];
int_tp d_col_end[6];
__global const int_tp* im_shape_ptr = im_shape + channel_axis;
__global const int_tp* col_shape_ptr = col_shape + channel_axis;
__local int_tp shared_dilation[6];
__local int_tp shared_kernel_shape[6];
__local int_tp shared_pad[6];
__local int_tp shared_stride[6];
__local int_tp shared_col_shape[6 + 1];
__local int_tp shared_im_shape[6 + 1];
for (int li = get_local_id(0); li < num_axes; li += get_local_size(0)) {
shared_dilation[li] = dilation[li];
shared_kernel_shape[li] = kernel_shape[li];
shared_pad[li] = pad[li];
shared_stride[li] = stride[li];
}
for (int li = get_local_id(0); li < num_axes + 1; li += get_local_size(0)) {
shared_col_shape[li] = col_shape_ptr[li];
shared_im_shape[li] = im_shape_ptr[li];
}
barrier(CLK_LOCAL_MEM_FENCE);
for (int_tp index = get_global_id(0); index < n; index += get_global_size(0)) {
// Initialize channel_in, computed in the loop below, with intermediate
// computations used to compute the spatial indices.
int_tp c_im = index;
// Calculate d_im (image dimensions).
for (int_tp i = num_axes - 1; i >= 0; --i) {
d_im[i] = c_im % shared_im_shape[i + 1] + shared_pad[i];
c_im /= shared_im_shape[i + 1];
}
// Calculate col start/end indices.
bool done = false;
for (int_tp i = 0; i < num_axes; ++i) {
const int_tp kernel_extent = shared_dilation[i]
* (shared_kernel_shape[i] - 1) + 1;
d_col_start[i] = d_col_iter[i] =
(d_im[i] < kernel_extent) ?
0 : (d_im[i] - kernel_extent) / shared_stride[i] + 1;
d_col_end[i] = min(d_im[i] / shared_stride[i] + 1,
shared_col_shape[i + 1]);
if (d_col_start[i] >= d_col_end[i]) {
// Skip computation if the dimension is 0 at any spatial axis --
// final val will be 0.
data_im[index] = 0;
done = true;
break; // for (int_tp i = 0; i < num_axes; ++i)
}
}
if (!done) {
// Loop over the col to compute the output val.
Dtype val = 0;
bool incremented = true;
bool skip = false;
do {
// Compute the final offset.
int_tp final_offset = 0;
int_tp kernel_shape_prod = 1;
int_tp kernel_index;
for (int_tp i = num_axes - 1; i >= 0; --i) {
kernel_index = d_im[i] - d_col_iter[i] * shared_stride[i];
if (kernel_index % shared_dilation[i]) {
skip = true;
break;
} else {
kernel_index /= shared_dilation[i];
final_offset += kernel_index * kernel_shape_prod;
kernel_shape_prod *= shared_kernel_shape[i];
}
}
if (!skip) {
final_offset += kernel_shape_prod * c_im;
for (int_tp i = 0; i < num_axes; ++i) {
final_offset *= shared_col_shape[i + 1];
final_offset += d_col_iter[i];
}
val += data_col[data_col_off + final_offset];
}
skip = false;
incremented = false;
for (int_tp i = num_axes - 1; i >= 0; --i) {
const int_tp d_max = d_col_end[i];
if (d_col_iter[i] == d_max - 1) {
d_col_iter[i] = d_col_start[i];
} else { // d_col_iter[i] < d_max - 1
++d_col_iter[i];
incremented = true;
break; // for (int_tp i = num_axes - 1; i >= 0; --i)
}
} // for (int_tp i = num_axes - 1; i >= 0; --i)
} while (incremented);
data_im[data_im_off + index] = val;
}
}
}
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