add GetParamNames() test=develop

lite/api/cxx_api.cc

@@ -150,6 +150,11 @@ std::vector<std::string> Predictor::GetInputNames() { return input_names_; }
 // get outputnames
 std::vector<std::string> Predictor::GetOutputNames() { return output_names_; }
 
+// get param names
+std::vector<std::string> Predictor::GetParamNames() {
+  return exec_scope_->LocalVarNames();
+}
+
 // append the names of inputs and outputs into input_names_ and output_names_
 void Predictor::PrepareFeedFetch() {
   if (!program_) {

lite/api/cxx_api.h

@@ -84,6 +84,9 @@ class LITE_API Predictor {
   // get inputnames and get outputnames.
   std::vector<std::string> GetInputNames();
   std::vector<std::string> GetOutputNames();
+  // get param names
+  std::vector<std::string> GetParamNames();
+
   void PrepareFeedFetch();
 
   // Get offset-th col of fetch results.
@@ -144,6 +147,8 @@ class CxxPaddleApiImpl : public lite_api::PaddlePredictor {
   // get inputs names and get outputs names
   std::vector<std::string> GetInputNames() override;
   std::vector<std::string> GetOutputNames() override;
+  // get param names
+  std::vector<std::string> GetParamNames() override;
 
   // get tensor according to tensor's name
   std::unique_ptr<const lite_api::Tensor> GetTensor(

lite/api/cxx_api_impl.cc

@@ -75,6 +75,10 @@ std::vector<std::string> CxxPaddleApiImpl::GetInputNames() {
   return raw_predictor_.GetInputNames();
 }
 
+std::vector<std::string> CxxPaddleApiImpl::GetParamNames() {
+  return raw_predictor_.GetParamNames();
+}
+
 std::vector<std::string> CxxPaddleApiImpl::GetOutputNames() {
   return raw_predictor_.GetOutputNames();
 }

lite/api/paddle_api.cc

@@ -173,6 +173,11 @@ std::unique_ptr<Tensor> PaddlePredictor::GetMutableTensor(
   return nullptr;
 }
 
+std::vector<std::string> PaddlePredictor::GetParamNames() {
+  LOG(FATAL)
+      << "The GetParamNames API is only supported by CxxConfig predictor.";
+}
+
 void PaddlePredictor::SaveOptimizedModel(const std::string &model_dir,
                                          LiteModelType model_type,
                                          bool record_info) {

lite/api/paddle_api.h

@@ -86,6 +86,8 @@ class LITE_API PaddlePredictor {
   virtual std::vector<std::string> GetInputNames() = 0;
   // Get output names
   virtual std::vector<std::string> GetOutputNames() = 0;
+  // Get output names
+  virtual std::vector<std::string> GetParamNames();
 
   // Get Input by name
   virtual std::unique_ptr<Tensor> GetInputByName(const std::string& name) = 0;