fix trt weight bug (#21231)

added splitter "__" between weight name and suffix number to avoid conflicts.

paddle/fluid/inference/tensorrt/engine.cc

@@ -211,7 +211,8 @@ float *TensorRTEngine::GetWeightCPUData(const std::string &name,
                                         const std::vector<float> &scale) {
   static int name_suffix_counter = 0;
   std::string name_suffix = std::to_string(name_suffix_counter);
-  std::string name_with_suffix = name + name_suffix;
+  std::string splitter = "__";
+  std::string name_with_suffix = name + splitter + name_suffix;
   auto w_dims = weight_tensor->dims();
   platform::CPUPlace cpu_place;
   PADDLE_ENFORCE_EQ(

paddle/fluid/inference/tensorrt/engine.h

@@ -159,7 +159,8 @@ class TensorRTEngine {
                   std::unique_ptr<framework::Tensor> w_tensor) {
     static int suffix_counter = 0;
     std::string suffix = std::to_string(suffix_counter);
-    weight_map[w_name + suffix] = std::move(w_tensor);
+    std::string splitter = "__";
+    weight_map[w_name + splitter + suffix] = std::move(w_tensor);
     suffix_counter += 1;
   }