67 lines
1.9 KiB
C++
67 lines
1.9 KiB
C++
/* Copyright 2017 The TensorFlow Authors. All Rights Reserved.
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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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==============================================================================*/
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// Contains helpers for use in shape inference.
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#include "tensorflow/compiler/jit/shape_inference_helpers.h"
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#include <vector>
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#include "tensorflow/core/graph/graph.h"
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namespace tensorflow {
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Status BackEdgeHelper::Remove(Graph* graph) {
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if (graph_ != nullptr) {
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return errors::Internal("BackEdgeHelper duplicate call to Remove.");
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}
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graph_ = graph;
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for (Node* n : graph_->nodes()) {
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if (n->IsMerge()) {
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for (const Edge* e : n->in_edges()) {
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if (e->src()->IsNextIteration()) {
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back_edges_.push_back(
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BackEdge{e, e->src(), e->src_output(), e->dst(), e->dst_input()});
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}
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}
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}
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}
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for (const BackEdge& be : back_edges_) {
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graph_->RemoveEdge(be.edge);
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}
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return Status::OK();
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}
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const std::vector<BackEdgeHelper::BackEdge>& BackEdgeHelper::RemovedEdges()
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const {
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return back_edges_;
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}
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Status BackEdgeHelper::Replace() {
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if (graph_ == nullptr) {
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return errors::Internal("BackEdgeHelper Replace called before Remove.");
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}
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if (replaced_) {
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return errors::Internal("BackEdgeHelper Replace called more than once.");
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}
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replaced_ = true;
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for (const BackEdge& be : back_edges_) {
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graph_->AddEdge(be.src, be.src_output, be.dst, be.dst_input);
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}
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return Status::OK();
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}
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} // namespace tensorflow
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