| /* |
| * Copyright (c) 2020-2021 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/Helpers.h" |
| #include "arm_compute/core/ITensorPack.h" |
| #include "arm_compute/core/Window.h" |
| #include "src/core/NEON/NEMath.h" |
| #include "src/core/NEON/wrapper/wrapper.h" |
| |
| #include <arm_neon.h> |
| #include <cmath> |
| #include <cstddef> |
| |
| namespace arm_compute |
| { |
| namespace cpu |
| { |
| namespace |
| { |
| #ifndef __aarch64__ |
| inline float32x4_t mask_float_vector(const float32x4_t &in, const uint32x4_t &mask) |
| { |
| auto int_in = vreinterpretq_u32_f32(in); |
| return vreinterpretq_f32_u32(wrapper::vand(int_in, mask)); |
| } |
| #endif /* __aarch64__ */ |
| } // namespace |
| |
| void fp32_neon_activation(const ITensor *src, ITensor *dst, const ActivationLayerInfo &act_info, const Window &window) |
| { |
| /** Neon vector tag type. */ |
| using ExactTagType = typename arm_compute::wrapper::traits::neon_bitvector_tag_t<float, wrapper::traits::BitWidth::W128>; |
| |
| constexpr int window_step_x = 4; |
| const auto window_start_x = static_cast<int>(window.x().start()); |
| const auto window_end_x = static_cast<int>(window.x().end()); |
| const ActivationLayerInfo::ActivationFunction act = act_info.activation(); |
| |
| Window win_collapsed = window.collapse_if_possible(window, Window::DimZ); |
| win_collapsed.set(Window::DimX, Window::Dimension(0, 1, 1)); |
| |
| Iterator input(src, win_collapsed); |
| Iterator output(dst, win_collapsed); |
| |
| // In case of non-aarch64, a small delta value is added to the input |
| // to prevent NAN values caused by zeros in inputs to SQRT. |
| // In case of aarh64, we call vsqrt directly, so we don't use delta. |
| #ifndef __aarch64__ |
| const auto delta = wrapper::vdup_n(static_cast<float>(1e-24), ExactTagType {}); |
| #endif /* __aarch64__ */ |
| const auto const_1 = wrapper::vdup_n(static_cast<float>(1.f), ExactTagType {}); |
| const auto const_0 = wrapper::vdup_n(static_cast<float>(0.f), ExactTagType{}); |
| const auto const_6 = wrapper::vdup_n(static_cast<float>(6.f), ExactTagType{}); |
| const auto const_3 = wrapper::vdup_n(static_cast<float>(3.f), ExactTagType{}); |
| const auto const_inv_6 = wrapper::vdup_n(static_cast<float>(0.166666667f), ExactTagType{}); |
| |
| constexpr float soft_relu_thresh = 12.f; |
| const auto vsoft_relu_thresh = wrapper::vdup_n(static_cast<float>(soft_relu_thresh), ExactTagType{}); |
| |
| const auto va = wrapper::vdup_n(static_cast<float>(act_info.a()), ExactTagType{}); |
| const auto vb = wrapper::vdup_n(static_cast<float>(act_info.b()), ExactTagType{}); |
| const auto a = static_cast<float>(act_info.a()); |
| const auto b = static_cast<float>(act_info.b()); |
| execute_window_loop(win_collapsed, [&](const Coordinates &) |
| { |
| const auto input_ptr = reinterpret_cast<const float *>(input.ptr()); |
| const auto output_ptr = reinterpret_cast<float *>(output.ptr()); |
| |
| wrapper::traits::neon_bitvector_t<float, wrapper::traits::BitWidth::W128> tmp; |
| |
| // Compute S elements per iteration |
| int x = window_start_x; |
| for(; x <= (window_end_x - window_step_x); x += window_step_x) |
| { |
| const auto vin = wrapper::vloadq(input_ptr + x); |
| switch(act) |
| { |
| case ActivationLayerInfo::ActivationFunction::ABS: |
| tmp = wrapper::vabs(vin); |
| break; |
| case ActivationLayerInfo::ActivationFunction::LINEAR: |
| tmp = wrapper::vmla(vb, va, vin); |
| break; |
| case ActivationLayerInfo::ActivationFunction::LOGISTIC: |
| tmp = wrapper::vinv(wrapper::vadd(const_1, wrapper::vexpq(wrapper::vneg(vin)))); |
| break; |
| case ActivationLayerInfo::ActivationFunction::RELU: |
| tmp = wrapper::vmax(const_0, vin); |
| break; |
| case ActivationLayerInfo::ActivationFunction::BOUNDED_RELU: |
| tmp = wrapper::vmin(va, wrapper::vmax(const_0, vin)); |
| break; |
| case ActivationLayerInfo::ActivationFunction::LU_BOUNDED_RELU: |
| tmp = wrapper::vmin(va, wrapper::vmax(vb, vin)); |
| break; |
| case ActivationLayerInfo::ActivationFunction::LEAKY_RELU: |
| tmp = wrapper::vbsl(wrapper::vcgt(vin, const_0), vin, wrapper::vmul(va, vin)); |
| break; |
| case ActivationLayerInfo::ActivationFunction::SOFT_RELU: |
| tmp = wrapper::vbsl(wrapper::vcgt(vin, vsoft_relu_thresh), vin, wrapper::vlog(wrapper::vadd(const_1, wrapper::vexpq(vin)))); |
| break; |
| case ActivationLayerInfo::ActivationFunction::ELU: |
| tmp = wrapper::vbsl(wrapper::vcge(vin, const_0), vin, wrapper::vmul(va, wrapper::vsub(wrapper::vexpq(vin), const_1))); |
| break; |
| case ActivationLayerInfo::ActivationFunction::SQRT: |
| #ifdef __aarch64__ |
| tmp = wrapper::vsqrt(vin); |
| #else /* __aarch64__ */ |
| { |
| const auto bitmask = wrapper::vceq(vin, wrapper::vdup_n(0.f, ExactTagType{})); |
| tmp = wrapper::vinv(wrapper::vinvsqrt(wrapper::vadd(vin, mask_float_vector(delta, bitmask)))); |
| tmp = mask_float_vector(tmp, wrapper::vnot(bitmask)); |
| } |
| #endif /* __aarch64__ */ |
| break; |
| case ActivationLayerInfo::ActivationFunction::SQUARE: |
| tmp = wrapper::vmul(vin, vin); |
| break; |
| case ActivationLayerInfo::ActivationFunction::TANH: |
| tmp = wrapper::vmul(va, wrapper::vtanh(wrapper::vmul(vb, vin))); |
| break; |
| case ActivationLayerInfo::ActivationFunction::IDENTITY: |
| tmp = vin; |
| break; |
| case ActivationLayerInfo::ActivationFunction::HARD_SWISH: |
| tmp = wrapper::vmul(vin, wrapper::vmul(const_inv_6, wrapper::vmin(const_6, wrapper::vmax(const_0, wrapper::vadd(vin, const_3))))); |
| break; |
| default: |
| ARM_COMPUTE_ERROR("Unsupported activation function"); |
| } |
| wrapper::vstore(output_ptr + x, tmp); |
| } |
| |
| // Compute left-over elements |
| for(; x < window_end_x; ++x) |
| { |
| const float in = *(reinterpret_cast<const float *>(input_ptr + x)); |
| float tmp; |
| switch(act) |
| { |
| case ActivationLayerInfo::ActivationFunction::ABS: |
| tmp = std::abs(in); |
| break; |
| case ActivationLayerInfo::ActivationFunction::LINEAR: |
| tmp = a * in + b; |
| break; |
| case ActivationLayerInfo::ActivationFunction::LOGISTIC: |
| tmp = static_cast<float>(1) / (static_cast<float>(1) + std::exp(-in)); |
| break; |
| case ActivationLayerInfo::ActivationFunction::RELU: |
| tmp = std::max<float>(static_cast<float>(0), in); |
| break; |
| case ActivationLayerInfo::ActivationFunction::BOUNDED_RELU: |
| tmp = std::min<float>(a, std::max(static_cast<float>(0), in)); |
| break; |
| case ActivationLayerInfo::ActivationFunction::LU_BOUNDED_RELU: |
| tmp = std::min<float>(a, std::max<float>(b, in)); |
| break; |
| case ActivationLayerInfo::ActivationFunction::LEAKY_RELU: |
| tmp = (in > 0) ? in : a * in; |
| break; |
| case ActivationLayerInfo::ActivationFunction::SOFT_RELU: |
| tmp = (in > soft_relu_thresh) ? in : std::log(static_cast<float>(1) + std::exp(in)); |
| break; |
| case ActivationLayerInfo::ActivationFunction::ELU: |
| tmp = (in >= 0) ? in : a * (std::exp(in) - 1); |
| break; |
| case ActivationLayerInfo::ActivationFunction::SQRT: |
| tmp = std::sqrt(in); |
| break; |
| case ActivationLayerInfo::ActivationFunction::SQUARE: |
| tmp = in * in; |
| break; |
| case ActivationLayerInfo::ActivationFunction::TANH: |
| tmp = a * std::tanh(b * in); |
| break; |
| case ActivationLayerInfo::ActivationFunction::IDENTITY: |
| tmp = in; |
| break; |
| case ActivationLayerInfo::ActivationFunction::HARD_SWISH: |
| tmp = in * ((std::min(std::max((in + 3), 0.0f), 6.0f)) * 0.166666667f); |
| break; |
| default: |
| ARM_COMPUTE_ERROR("Unsupported activation function"); |
| } |
| *(output_ptr + x) = tmp; |
| } |
| }, |
| input, output); |
| } |
| } // namespace cpu |
| } // namespace arm_compute |