1 /* Copyright 2016 The TensorFlow Authors. All Rights Reserved. 2 3 Licensed under the Apache License, Version 2.0 (the "License"); 4 you may not use this file except in compliance with the License. 5 You may obtain a copy of the License at 6 7 http://www.apache.org/licenses/LICENSE-2.0 8 9 Unless required by applicable law or agreed to in writing, software 10 distributed under the License is distributed on an "AS IS" BASIS, 11 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 See the License for the specific language governing permissions and 13 limitations under the License. 14 ==============================================================================*/ 15 16 #if GOOGLE_CUDA 17 #define EIGEN_USE_GPU 18 #include "cuda/include/cuda.h" 19 #include "tensorflow/core/kernels/fused_batch_norm_op.h" 20 #include "tensorflow/core/util/cuda_kernel_helper.h" 21 22 namespace tensorflow { 23 namespace functor { 24 25 template struct FusedBatchNormFreezeGrad<Eigen::GpuDevice, float, float>; 26 template struct FusedBatchNormFreezeGrad<Eigen::GpuDevice, Eigen::half, float>; 27 28 template <class T> 29 __global__ void VarianceToInvVarianceKernel(int nthreads, const T* input, 30 double epsilon, T* output) { 31 CUDA_1D_KERNEL_LOOP(index, nthreads) { 32 output[index] = rsqrt(input[index] + T(epsilon)); 33 } 34 } 35 36 template <class T> 37 void VarianceToInvVariance<T>::operator()(const Eigen::GpuDevice& d, 38 const T* variance, double epsilon, 39 int channels, T* inv_variance) { 40 CudaLaunchConfig config = GetCudaLaunchConfig(channels, d); 41 VarianceToInvVarianceKernel<<<config.block_count, config.thread_per_block, 0, 42 d.stream()>>>(config.virtual_thread_count, 43 variance, epsilon, inv_variance); 44 } 45 46 template <class T> 47 __global__ void InvVarianceToVarianceKernel(int nthreads, double epsilon, 48 int sample_size, T* variance) { 49 CUDA_1D_KERNEL_LOOP(index, nthreads) { 50 T inv_var = variance[index]; 51 T var = __fdividef(1, inv_var * inv_var) - T(epsilon); 52 // This is for Bessel's correction 53 var *= T(sample_size) / T((sample_size > 1) ? sample_size - 1 : 1); 54 variance[index] = (var > 0) ? var : 0; 55 } 56 } 57 58 template <class T> 59 void InvVarianceToVariance<T>::operator()(const Eigen::GpuDevice& d, 60 double epsilon, int sample_size, 61 int channels, T* variance) { 62 CudaLaunchConfig config = GetCudaLaunchConfig(channels, d); 63 InvVarianceToVarianceKernel<<<config.block_count, config.thread_per_block, 0, 64 d.stream()>>>(config.virtual_thread_count, 65 epsilon, sample_size, variance); 66 } 67 68 template <class T> 69 void SetNanFunctor<T>::operator()(const Eigen::GpuDevice& d, 70 typename TTypes<T>::Flat out) { 71 To32Bit(out).device(d) = 72 To32Bit(out).constant(Eigen::NumTraits<T>::quiet_NaN()); 73 } 74 75 template class VarianceToInvVariance<float>; 76 template class InvVarianceToVariance<float>; 77 template class SetNanFunctor<float>; 78 } // namespace functor 79 } // namespace tensorflow 80 81 #else 82 83 #include "tensorflow/core/kernels/fused_batch_norm_op.h" 84 85 #endif // GOOGLE_CUDA 86
