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 #ifndef TENSORFLOW_KERNELS_SCAN_OPS_H_ 17 #define TENSORFLOW_KERNELS_SCAN_OPS_H_ 18 19 #include "third_party/eigen3/unsupported/Eigen/CXX11/Tensor" 20 #include "tensorflow/core/framework/tensor_types.h" 21 22 namespace tensorflow { 23 namespace functor { 24 25 typedef Eigen::Index Index; 26 27 template <typename Device, typename Reducer, typename T> 28 struct Scan { 29 void operator()(const Device& d, typename TTypes<T, 3>::ConstTensor in, 30 typename TTypes<T, 3>::Tensor out, const Reducer& reducer, 31 const bool reverse, const bool exclusive) { 32 // Perform the reverse ops directly with Eigen, which avoids copying the 33 // tensor twice compared to using individual ops. 34 Eigen::array<bool, 3> dims; 35 dims[0] = false; 36 dims[1] = reverse; 37 dims[2] = false; 38 To32Bit(out).device(d) = 39 To32Bit(in).reverse(dims).scan(1, reducer, exclusive).reverse(dims); 40 } 41 }; 42 43 } // namespace functor 44 } // namespace tensorflow 45 46 #endif // TENSORFLOW_KERNELS_SCAN_OPS_H_ 47
