pdnode_compare (#42597)

* pdnode_compare

* panode compare

* pdnode_compare

paddle/fluid/framework/ir/graph_pattern_detector.h

@@ -81,6 +81,7 @@ struct PDNode {
   bool IsVar() const { return type_ == Type::kVar; }
 
   const std::string& name() const { return name_; }
+  const PDPattern* pdpattern() const { return pattern_; }
 
   PDNode& operator=(const PDNode&) = delete;
   PDNode(const PDNode&) = delete;
@@ -277,7 +278,44 @@ class PDPattern {
  */
 class GraphPatternDetector {
  public:
-  using subgraph_t = std::map<PDNode*, Node*>;
+  struct NodeIdCompare {
+    bool operator()(Node* node1, Node* node2) const {
+      return node1->id() < node2->id();
+    }
+  };
+
+  struct PDNodeCompare {
+    bool operator()(const PDNode* node1, const PDNode* node2) const {
+      auto& nodes1 = node1->pdpattern()->nodes();
+      auto& nodes2 = node2->pdpattern()->nodes();
+      if (nodes1.size() != nodes2.size()) {
+        return nodes1.size() < nodes2.size();
+      } else {
+        std::string pdnode_hash_key1 = "";
+        std::string pdnode_hash_key2 = "";
+        for (auto& node : nodes1) {
+          pdnode_hash_key1 += node.get()->name();
+          pdnode_hash_key1 += "#";
+        }
+        pdnode_hash_key1 += node1->name();
+        for (auto& node : nodes2) {
+          pdnode_hash_key2 += node.get()->name();
+          pdnode_hash_key2 += "#";
+        }
+        pdnode_hash_key2 += node2->name();
+
+        auto pdnode_key1 =
+            std::to_string(std::hash<std::string>()(pdnode_hash_key1));
+        auto pdnode_key2 =
+            std::to_string(std::hash<std::string>()(pdnode_hash_key2));
+
+        return pdnode_key1 < pdnode_key2;
+      }
+      return false;
+    }
+  };
+
+  using subgraph_t = std::map<PDNode*, Node*, PDNodeCompare>;
 
   // Operate on the detected pattern.
   using handle_t =
@@ -321,7 +359,8 @@ class GraphPatternDetector {
   using hit_rcd_t =
       std::pair<Node* /*node in graph*/, PDNode* /*node in pattern*/>;
   PDPattern pattern_;
-  std::map<const PDNode*, std::set<Node*>> pdnodes2nodes_;
+  std::map<const PDNode*, std::set<Node*, NodeIdCompare>, PDNodeCompare>
+      pdnodes2nodes_;
 };
 
 // some helper methods.