optimize fusion pass logs to avoid duplication (#34261)

paddle/fluid/framework/ir/fuse_pass_base.cc

@@ -53,6 +53,8 @@ void FusePassBase::AddStatis(int count_of_fused) const {
   auto& info =
       graph_->Get<std::unordered_map<std::string, int>>(kFuseStatisAttr);
   info[repr_] = count_of_fused;
+  if (count_of_fused > 0)
+    LOG(INFO) << "---  detected " << count_of_fused << " subgraphs";
 }
 
 FuseOptions FusePassBase::FindFuseOption(const Node& node1,

paddle/fluid/framework/ir/graph_pattern_detector.cc

@@ -88,7 +88,7 @@ void GraphPatternDetector::operator()(Graph *graph,
   ValidateByNodeRole(&subgraphs);
 
   if (subgraphs.empty()) return;
-  LOG(INFO) << "---  detected " << subgraphs.size() << " subgraphs";
+
   int id = 0;
   for (auto &g : subgraphs) {
     VLOG(3) << "optimizing #" << id++ << " subgraph";