| /** |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #include "singa/model/layer.h" |
| #include "./flatten.h" |
| namespace singa { |
| |
| RegisterLayerClass(singa_flatten, Flatten); |
| RegisterLayerClass(singacpp_flatten, Flatten); |
| RegisterLayerClass(singacuda_flatten, Flatten); |
| RegisterLayerClass(singacl_flatten, Flatten); |
| void Flatten::Setup(const Shape& in_sample, const LayerConf &conf) { |
| Layer::Setup(in_sample, conf); |
| axis_ = conf.flatten_conf().axis(); |
| size_t len = 1; |
| if (axis_ > 0) |
| for (size_t i = axis_ - 1; i < in_sample.size(); i++) |
| len *= in_sample.at(i); |
| out_sample_shape_.push_back(len); |
| } |
| |
| const Tensor Flatten::Forward(int flag, const Tensor &input) { |
| Tensor output; |
| input_shape_ = input.shape(); |
| if (axis_ == 0) |
| output = Reshape(input, vector<size_t>{input.Size()}); |
| else |
| output = |
| Reshape(input, vector<size_t>{input.Size() / out_sample_shape_.at(0), |
| out_sample_shape_.at(0)}); |
| return output; |
| } |
| |
| const std::pair<Tensor, vector<Tensor> > Flatten::Backward(int flag, |
| const Tensor &grad) { |
| vector<Tensor> param_grad; |
| Tensor input_grad = Reshape(grad, input_shape_); |
| return std::make_pair(input_grad, param_grad); |
| } |
| |
| } // namespace singa |