telsoa01 | 4fcda01 | 2018-03-09 14:13:49 +0000 | [diff] [blame] | 1 | // |
| 2 | // Copyright © 2017 Arm Ltd. All rights reserved. |
David Beck | ecb56cd | 2018-09-05 12:52:57 +0100 | [diff] [blame] | 3 | // SPDX-License-Identifier: MIT |
telsoa01 | 4fcda01 | 2018-03-09 14:13:49 +0000 | [diff] [blame] | 4 | // |
| 5 | |
| 6 | #include "Activation.hpp" |
| 7 | |
| 8 | #include <boost/log/trivial.hpp> |
| 9 | |
| 10 | #include <cmath> |
| 11 | |
| 12 | namespace armnn |
| 13 | { |
| 14 | |
| 15 | void Activation(const float* in, |
| 16 | float* out, |
| 17 | const TensorInfo& tensorInfo, |
| 18 | ActivationFunction function, |
| 19 | float a, |
| 20 | float b) |
| 21 | { |
| 22 | for (size_t i = 0; i<tensorInfo.GetNumElements(); i++) |
| 23 | { |
| 24 | float input = in[i]; |
| 25 | float output; |
| 26 | |
telsoa01 | c577f2c | 2018-08-31 09:22:23 +0100 | [diff] [blame] | 27 | // Compute the result of the activation function. |
telsoa01 | 4fcda01 | 2018-03-09 14:13:49 +0000 | [diff] [blame] | 28 | switch (function) |
| 29 | { |
| 30 | case ActivationFunction::Linear: |
| 31 | { |
| 32 | output = a * input + b; |
| 33 | break; |
| 34 | } |
| 35 | case ActivationFunction::Sigmoid: |
| 36 | { |
| 37 | output = 1.f / (1.f + expf(-input)); |
| 38 | break; |
| 39 | } |
| 40 | case ActivationFunction::ReLu: |
| 41 | { |
| 42 | output = std::max(0.f, input); |
| 43 | break; |
| 44 | } |
| 45 | case ActivationFunction::BoundedReLu: |
| 46 | { |
| 47 | output = std::min(a, std::max(b, input)); |
| 48 | break; |
| 49 | } |
| 50 | case ActivationFunction::SoftReLu: |
| 51 | { |
| 52 | output = logf(1.0f + expf(input)); |
| 53 | break; |
| 54 | } |
| 55 | case ActivationFunction::LeakyReLu: |
| 56 | { |
| 57 | output = input > 0.0f ? input : (input * a); |
| 58 | break; |
| 59 | } |
| 60 | case ActivationFunction::Abs: |
| 61 | { |
| 62 | output = input < 0 ? -input : input; |
| 63 | break; |
| 64 | } |
| 65 | case ActivationFunction::Sqrt: |
| 66 | { |
| 67 | output = sqrtf(input); |
| 68 | break; |
| 69 | } |
| 70 | case ActivationFunction::Square: |
| 71 | { |
| 72 | output = input * input; |
| 73 | break; |
| 74 | } |
| 75 | case ActivationFunction::TanH: |
| 76 | { |
| 77 | output = a * tanhf(b * input); |
| 78 | break; |
| 79 | } |
| 80 | default: |
| 81 | { |
| 82 | BOOST_LOG_TRIVIAL(error) << "Unsupported activation function"; |
| 83 | return; |
| 84 | } |
| 85 | } |
| 86 | |
| 87 | out[i] = output; |
| 88 | } |
| 89 | } |
| 90 | |
| 91 | } //namespace armnn |