Add an argument in Executor.Run to allow users to choose whether to create and...

Add an argument in Executor.Run to allow users to choose whether to create and destroy variables every time. (#9242)

paddle/fluid/framework/executor.cc

@@ -185,7 +185,7 @@ void Executor::Run(const ProgramDesc& program, Scope* scope,
                    std::map<std::string, const LoDTensor*>& feed_targets,
                    std::map<std::string, LoDTensor*>& fetch_targets,
                    const std::string& feed_holder_name,
-                   const std::string& fetch_holder_name) {
+                   const std::string& fetch_holder_name, bool create_vars) {
   platform::RecordBlock b(kProgramId);
   bool has_feed_ops =
       has_feed_operators(program.Block(0), feed_targets, feed_holder_name);
@@ -255,7 +255,7 @@ void Executor::Run(const ProgramDesc& program, Scope* scope,
     }
   }
 
-  Run(*copy_program, scope, 0, true, true);
+  Run(*copy_program, scope, 0, create_vars, create_vars);
 
   // obtain the data of fetch_targets from fetch_holder
   for (auto* op : global_block->AllOps()) {

paddle/fluid/framework/executor.h

@@ -54,7 +54,8 @@ class Executor {
            std::map<std::string, const LoDTensor*>& feed_targets,
            std::map<std::string, LoDTensor*>& fetch_targets,
            const std::string& feed_holder_name = "feed",
-           const std::string& fetch_holder_name = "fetch");
+           const std::string& fetch_holder_name = "fetch",
+           bool create_vars = true);
 
   static std::unique_ptr<ExecutorPrepareContext> Prepare(
       const ProgramDesc& program, int block_id);