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104 lines
3.1 KiB
104 lines
3.1 KiB
/* Copyright (c) 2016 PaddlePaddle Authors. All Rights Reserve.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License. */
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#include "Projection.h"
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#include "paddle/utils/Stat.h"
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namespace paddle {
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/**
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* IdentityProjection performs addition:
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* \f[
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* out.row[i] += in.row[i]
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* \f]
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*
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* The config file api is identity_projection.
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*/
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class IdentityProjection : public Projection {
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public:
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IdentityProjection(const ProjectionConfig& config,
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const ParameterPtr& parameter,
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bool useGpu);
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virtual void forward();
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virtual void backward(const UpdateCallback& callback);
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};
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REGISTER_PROJECTION(identity, IdentityProjection);
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/**
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* Constructed function.
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* @note IdentityProjection should not have any parameter.
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*/
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IdentityProjection::IdentityProjection(const ProjectionConfig& config,
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const ParameterPtr& parameter,
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bool useGpu)
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: Projection(config, parameter, useGpu) {
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CHECK(!parameter) << "'identity' projection should not have any parameter";
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}
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void IdentityProjection::forward() { out_->value->add(*in_->value); }
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void IdentityProjection::backward(const UpdateCallback& callback) {
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if (in_->grad) {
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in_->grad->add(*out_->grad);
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}
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}
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/**
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* IdentityOffsetProjection likes IdentityProjection, but layer size may be
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* smaller
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* than input size. It selects dimensions [offset, offset+layer_size) from input
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* to
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* perform addition:
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* \f[
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* out.row[i] += in.row[i + \textrm{offset}]
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* \f]
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*
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* The config file api is identity_projection.
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*/
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class IdentityOffsetProjection : public Projection {
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public:
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IdentityOffsetProjection(const ProjectionConfig& config,
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const ParameterPtr& parameter,
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bool useGpu);
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virtual void forward();
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virtual void backward(const UpdateCallback& callback);
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};
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REGISTER_PROJECTION(identity_offset, IdentityOffsetProjection);
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/**
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* Constructed function.
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* @note IdentityOffsetProjection should not have any parameter.
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*/
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IdentityOffsetProjection::IdentityOffsetProjection(
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const ProjectionConfig& config, const ParameterPtr& parameter, bool useGpu)
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: Projection(config, parameter, useGpu) {
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CHECK(!parameter) << "'identity_offset' projection "
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"should not have any parameter";
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CHECK_LE(config.output_size() + config.offset(), config.input_size());
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}
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void IdentityOffsetProjection::forward() {
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out_->value->addAtOffset(*in_->value, config_.offset());
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}
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void IdentityOffsetProjection::backward(const UpdateCallback& callback) {
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if (in_->grad) {
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in_->grad->addAtOffset(*out_->grad, config_.offset());
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}
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}
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} // namespace paddle
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