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/*
* Copyright (c) 2018 Arm Limited.
*
* SPDX-License-Identifier: MIT
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to
* deal in the Software without restriction, including without limitation the
* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
* sell copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#include "helpers.h"
#if defined(DATA_TYPE) && defined(WIDTH) && defined(HEIGHT) && defined(LAYER_WIDTH) && defined(LAYER_HEIGHT) && defined(OFFSET) && defined(STEP_X) && defined(STEP_Y) && defined(NUM_PRIORS) && defined(VARIANCE_0) && defined(VARIANCE_1) && defined(VARIANCE_2) && defined(VARIANCE_3)
/** Compute prior boxes and clip (NCHW)
*
* @param[out] output_ptr Pointer to the destination tensor. Supported data types: F32
* @param[in] output_stride_x Stride of the destination tensor in X dimension (in bytes)
* @param[in] output_step_x output_stride_x * number of elements along X processed per workitem(in bytes)
* @param[in] output_stride_y Stride of the destination tensor in Y dimension (in bytes)
* @param[in] output_step_y output_stride_y * number of elements along Y processed per workitem(in bytes)
* @param[in] output_offset_first_element_in_bytes The offset of the first element in the destination tensor
* @param[in] idx Index to write to
* @param[in] center_x Center value of the x axis
* @param[in] center_y Center value of the y axis
* @param[in] box_width Prior box width
* @param[in] box_height Prior box height
*
*/
inline void calculate_xy_min_max_nchw(Image *out, int idx, float center_x, float center_y, float box_width, float box_height)
{
float xmin = (center_x - box_width / 2.f) / WIDTH;
float ymin = (center_y - box_height / 2.f) / HEIGHT;
float xmax = (center_x + box_width / 2.f) / WIDTH;
float ymax = (center_y + box_height / 2.f) / HEIGHT;
#if defined(CLIP)
xmin = clamp(xmin, 0.f, 1.f);
ymin = clamp(ymin, 0.f, 1.f);
xmax = clamp(xmax, 0.f, 1.f);
ymax = clamp(ymax, 0.f, 1.f);
#endif // defined(CLIP)
// Store result
vstore4((VEC_DATA_TYPE(DATA_TYPE, 4))(xmin, ymin, xmax, ymax), 0, ((__global DATA_TYPE *)offset(out, idx + 0, 0)));
}
/** Compute prior boxes (NCHW)
*
* @param[out] output_ptr Pointer to the destination tensor. Supported data types: F32
* @param[in] output_stride_x Stride of the destination tensor in X dimension (in bytes)
* @param[in] output_step_x output_stride_x * number of elements along X processed per workitem(in bytes)
* @param[in] output_stride_y Stride of the destination tensor in Y dimension (in bytes)
* @param[in] output_step_y output_stride_y * number of elements along Y processed per workitem(in bytes)
* @param[in] output_offset_first_element_in_bytes The offset of the first element in the destination tensor
* @param[in] min_size Prior box min size
* @param[in] min_idx Index of the min vector
* @param[in] idx Index to write to
*
* @return The updated index
*/
inline int calculate_min_nchw(Image *out, __global float *max, __global float *aspect_ratios, int max_size, int aspect_ratios_size, float min_size, int min_idx, int idx)
{
const float center_x = ((float)(get_global_id(0) % LAYER_WIDTH) + OFFSET) * STEP_X;
const float center_y = ((float)(get_global_id(0) / LAYER_WIDTH) + OFFSET) * STEP_Y;
float box_width = min_size;
float box_height = min_size;
calculate_xy_min_max_nchw(out, idx, center_x, center_y, box_width, box_height);
idx += 4;
if(max_size > 0)
{
box_width = sqrt(min_size * max[min_idx]);
box_height = box_width;
calculate_xy_min_max_nchw(out, idx, center_x, center_y, box_width, box_height);
idx += 4;
}
for(unsigned int i = 0; i < aspect_ratios_size; ++i)
{
if(fabs(aspect_ratios[i] - 1.f) < 1e-6f)
{
continue;
}
box_width = min_size * sqrt(aspect_ratios[i]);
box_height = min_size * rsqrt(aspect_ratios[i]);
calculate_xy_min_max_nchw(out, idx, center_x, center_y, box_width, box_height);
idx += 4;
}
return idx;
}
/** Calculate prior boxes with NCHW format.
*
* @param[out] output_ptr Pointer to the destination tensor. Supported data types: F32
* @param[in] output_stride_x Stride of the destination tensor in X dimension (in bytes)
* @param[in] output_step_x output_stride_x * number of elements along X processed per workitem(in bytes)
* @param[in] output_stride_y Stride of the destination tensor in Y dimension (in bytes)
* @param[in] output_step_y output_stride_y * number of elements along Y processed per workitem(in bytes)
* @param[in] output_offset_first_element_in_bytes The offset of the first element in the destination tensor
* @param[in] min The minimum values
* @param[in] max The maximum_values
* @param[in] aspect_ratios The aspect ratio values
* @param[in] min_size The minimum values size
* @param[in] max_size The maximum_values values size
* @param[in] aspect_ratios_size The aspect ratio values size
*/
__kernel void prior_box_layer_nchw(IMAGE_DECLARATION(output), __global float *min, __global float *max, __global float *aspect_ratios, unsigned int min_size, unsigned int max_size,
unsigned int aspect_ratios_size)
{
Image out = CONVERT_TO_IMAGE_STRUCT(output);
int idx = 0;
for(unsigned int i = 0; i < min_size; ++i)
{
idx = calculate_min_nchw(&out, max, aspect_ratios, max_size, aspect_ratios_size, min[i], i, idx);
}
// Store variances
for(int i = 0; i < (NUM_PRIORS * 4); i += 4)
{
vstore4((VEC_DATA_TYPE(DATA_TYPE, 4))(VARIANCE_0, VARIANCE_1, VARIANCE_2, VARIANCE_3), 0, ((__global DATA_TYPE *)offset(&out, i, 1)));
}
}
#endif /* defined(DATA_TYPE) && defined(WIDTH) && defined(HEIGHT) && defined(LAYER_WIDTH) && defined(LAYER_HEIGHT) && defined(OFFSET) && defined(STEP_X) && defined(STEP_Y) && defined(NUM_PRIORS) && defined(VARIANCE_0) && defined(VARIANCE_1) && defined(VARIANCE_2) && defined(VARIANCE_3) */
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