1 // Tencent is pleased to support the open source community by making ncnn available. 2 // 3 // Copyright (C) 2017 THL A29 Limited, a Tencent company. All rights reserved. 4 // 5 // Licensed under the BSD 3-Clause License (the "License"); you may not use this file except 6 // in compliance with the License. You may obtain a copy of the License at 7 // 8 // https://opensource.org/licenses/BSD-3-Clause 9 // 10 // Unless required by applicable law or agreed to in writing, software distributed 11 // under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR 12 // CONDITIONS OF ANY KIND, either express or implied. See the License for the 13 // specific language governing permissions and limitations under the License. 14 15 #include "log.h" 16 17 #include <math.h> 18 19 namespace ncnn { 20 Log()21Log::Log() 22 { 23 one_blob_only = true; 24 support_inplace = true; 25 } 26 load_param(const ParamDict & pd)27int Log::load_param(const ParamDict& pd) 28 { 29 base = pd.get(0, -1.f); 30 scale = pd.get(1, 1.f); 31 shift = pd.get(2, 0.f); 32 33 return 0; 34 } 35 forward_inplace(Mat & bottom_top_blob,const Option & opt) const36int Log::forward_inplace(Mat& bottom_top_blob, const Option& opt) const 37 { 38 int w = bottom_top_blob.w; 39 int h = bottom_top_blob.h; 40 int channels = bottom_top_blob.c; 41 int size = w * h; 42 43 if (base == -1.f) 44 { 45 #pragma omp parallel for num_threads(opt.num_threads) 46 for (int q = 0; q < channels; q++) 47 { 48 float* ptr = bottom_top_blob.channel(q); 49 50 for (int i = 0; i < size; i++) 51 { 52 ptr[i] = static_cast<float>(log(shift + ptr[i] * scale)); 53 } 54 } 55 } 56 else 57 { 58 float log_base_inv = static_cast<float>(1.f / log(base)); 59 60 #pragma omp parallel for num_threads(opt.num_threads) 61 for (int q = 0; q < channels; q++) 62 { 63 float* ptr = bottom_top_blob.channel(q); 64 65 for (int i = 0; i < size; i++) 66 { 67 ptr[i] = static_cast<float>(log(shift + ptr[i] * scale) * log_base_inv); 68 } 69 } 70 } 71 72 return 0; 73 } 74 75 } // namespace ncnn 76