Polish code

test=develop

paddle/fluid/framework/grad_op_desc_maker.h

@@ -55,14 +55,11 @@ class GradOpDescMakerBase {
                    std::back_inserter(ret_val),
                    [this](const std::string& fwd_var_name) -> std::string {
                      auto g_name = GradVarName(fwd_var_name);
-                     if (no_grad_set_.empty()) {
+                     if (no_grad_set_.empty() || !no_grad_set_.count(g_name)) {
                        (*this->grad_to_var_)[g_name] = fwd_var_name;
                        return g_name;
-                     } else if (no_grad_set_.count(g_name)) {
-                       return kEmptyVarName;
                      } else {
-                       (*this->grad_to_var_)[g_name] = fwd_var_name;
-                       return g_name;
+                       return kEmptyVarName;
                      }
                    });
     if (!drop_empty_grad) {

paddle/fluid/imperative/profiler.cc

@@ -36,13 +36,11 @@ static bool gTracerProfilerStarted = false;
 #endif
 
 void StartProfile() {
-  LOG(ERROR) << "XX " << FLAGS_tracer_profile_fname;
   if (!FLAGS_tracer_profile_fname.empty()) {
     std::call_once(gTracerProfileOnce, [] {
 #ifdef WITH_GPERFTOOLS
       ProfilerStart(FLAGS_tracer_profile_fname.c_str());
       gTracerProfilerStarted = true;
-      LOG(ERROR) << "YY";
 #else
       LOG(WARNING) << "Paddle is not compiled with gperftools. "
                       "FLAGS_tracer_profile_fname will be ignored";
@@ -52,7 +50,6 @@ void StartProfile() {
 }
 
 void StopProfile() {
-  LOG(ERROR) << "ZZ " << FLAGS_tracer_profile_fname;
 #ifdef WITH_GPERFTOOLS
   ProfilerFlush();
 #else