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70 lines
2.0 KiB
70 lines
2.0 KiB
// Copyright (c) 2018 PaddlePaddle Authors. All Rights Reserved.
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//
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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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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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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 <algorithm>
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#include "paddle/fluid/framework/ir/graph.h"
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#include "paddle/fluid/framework/ir/pass.h"
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namespace paddle {
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namespace framework {
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namespace ir {
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class InferCleanGraphPass : public Pass {
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public:
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virtual ~InferCleanGraphPass() {}
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protected:
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std::unique_ptr<ir::Graph> ApplyImpl(std::unique_ptr<ir::Graph> graph) const {
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PADDLE_ENFORCE(graph.get());
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auto is_valid_node = [](Node* x) {
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return x && IsControlDepVar(*x) && x->IsVar() && !x->Var();
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};
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std::unordered_set<Node*> invalid_nodes;
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for (auto* node : graph->Nodes()) {
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if (is_valid_node(node)) {
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invalid_nodes.insert(node);
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}
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}
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// remove nodes from the graph.
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for (auto* node : invalid_nodes) {
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graph->RemoveNode(node);
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}
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// clean edges.
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for (auto* node : graph->Nodes()) {
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CleanEdges(&node->inputs, invalid_nodes);
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CleanEdges(&node->outputs, invalid_nodes);
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}
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return graph;
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}
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void CleanEdges(std::vector<Node*>* nodes,
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const std::unordered_set<Node*>& to_remove) const {
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auto it = std::remove_if(nodes->begin(), nodes->end(),
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[&](Node* x) { return to_remove.count(x); });
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nodes->erase(it, nodes->end());
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}
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};
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} // namespace ir
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} // namespace framework
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} // namespace paddle
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REGISTER_PASS(infer_clean_graph_pass,
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paddle::framework::ir::InferCleanGraphPass);
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