From 4e09b3839206254d0df56095ad0762718a764c9c Mon Sep 17 00:00:00 2001 From: Michele Di Giorgio Date: Wed, 5 Jul 2017 18:20:02 +0100 Subject: COMPMID-439: Implement NEON Quantization Layer. Change-Id: Iefbb421915e56d880d6a3e20c113913560f6ca10 Reviewed-on: http://mpd-gerrit.cambridge.arm.com/79934 Tested-by: Kaizen Reviewed-by: Georgios Pinitas --- .../NEON/kernels/NEQuantizationLayerKernel.cpp | 106 +++++++++++++++++++++ 1 file changed, 106 insertions(+) create mode 100644 src/core/NEON/kernels/NEQuantizationLayerKernel.cpp (limited to 'src/core/NEON') diff --git a/src/core/NEON/kernels/NEQuantizationLayerKernel.cpp b/src/core/NEON/kernels/NEQuantizationLayerKernel.cpp new file mode 100644 index 0000000000..fbf7e1ba87 --- /dev/null +++ b/src/core/NEON/kernels/NEQuantizationLayerKernel.cpp @@ -0,0 +1,106 @@ +/* + * 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 + +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) +{ + 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(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(output.ptr()), quantized); + }, + input, output); +} -- cgit v1.2.1