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/*
* Copyright (c) 2017 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 "arm_compute/core/NEON/kernels/NEQuantizationLayerKernel.h"
#include "arm_compute/core/Error.h"
#include "arm_compute/core/Helpers.h"
#include "arm_compute/core/TensorInfo.h"
#include "arm_compute/core/Utils.h"
#include "arm_compute/core/Validate.h"
#include "arm_compute/core/Window.h"
#include <arm_neon.h>
using namespace arm_compute;
NEQuantizationLayerKernel::NEQuantizationLayerKernel()
: _input(nullptr), _output(nullptr), _min(nullptr), _max(nullptr)
{
}
void NEQuantizationLayerKernel::configure(const ITensor *input, ITensor *output, const float *min, const float *max)
{
ARM_COMPUTE_ERROR_ON_DATA_TYPE_CHANNEL_NOT_IN(input, 1, DataType::F32);
ARM_COMPUTE_ERROR_ON_NULLPTR(output);
// Output tensor auto initialization if not yet initialized
auto_init_if_empty(*output->info(), input->info()->tensor_shape(), 1, DataType::U8, 0);
ARM_COMPUTE_ERROR_ON_DATA_TYPE_CHANNEL_NOT_IN(output, 1, DataType::U8);
ARM_COMPUTE_ERROR_ON_MISMATCHING_SHAPES(input, output);
_input = input;
_output = output;
_min = min;
_max = max;
constexpr unsigned int num_elems_processed_per_iteration = 8;
// Configure window
Window win = calculate_max_window(*input->info(), Steps(num_elems_processed_per_iteration));
AccessWindowHorizontal output_access(output->info(), 0, num_elems_processed_per_iteration);
update_window_and_padding(win, AccessWindowHorizontal(input->info(), 0, num_elems_processed_per_iteration), output_access);
output_access.set_valid_region(win, input->info()->valid_region());
INEKernel::configure(win);
}
void NEQuantizationLayerKernel::run(const Window &window, const ThreadInfo &info)
{
ARM_COMPUTE_UNUSED(info);
ARM_COMPUTE_ERROR_ON_UNCONFIGURED_KERNEL(this);
ARM_COMPUTE_ERROR_ON_INVALID_SUBWINDOW(INEKernel::window(), window);
Iterator input(_input, window);
Iterator output(_output, window);
const float32x4_t vmin = vdupq_n_f32(*_min);
const float32x4_t inv_range = vdupq_n_f32(1.0f / (*_max - *_min));
const float32x4_t quantization_max = vdupq_n_f32(255.0f);
const float32x4_t quantization_mul = vdupq_n_f32(256.0f);
// Uniformly map values to range 8bit integers, i.e. [min, max] -> [0, 255]
execute_window_loop(window, [&](const Coordinates & id)
{
float32x4x2_t val = vld2q_f32(reinterpret_cast<const float *>(input.ptr()));
// Map float values to range [0.0, 1.0]
val.val[0] = vsubq_f32(val.val[0], vmin);
val.val[1] = vsubq_f32(val.val[1], vmin);
val.val[0] = vmulq_f32(val.val[0], inv_range);
val.val[1] = vmulq_f32(val.val[1], inv_range);
// Quantize
val.val[0] = vmulq_f32(val.val[0], quantization_mul);
val.val[1] = vmulq_f32(val.val[1], quantization_mul);
val.val[0] = vminq_f32(val.val[0], quantization_max);
val.val[1] = vminq_f32(val.val[1], quantization_max);
const uint32x4_t val_u32_low = vcvtq_u32_f32(val.val[0]);
const uint32x4_t val_u32_high = vcvtq_u32_f32(val.val[1]);
const uint16x4x2_t val_u16 = vzip_u16(vmovn_u32(val_u32_low), vmovn_u32(val_u32_high));
const uint8x8_t quantized = vmovn_u16(vcombine_u16(val_u16.val[0], val_u16.val[1]));
vst1_u8(reinterpret_cast<uint8_t *>(output.ptr()), quantized);
},
input, output);
}
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