fix Tracer::NoGrad, test=develop (#23443)

paddle/fluid/imperative/tracer.cc

@@ -70,7 +70,7 @@ void Tracer::TraceOp(const std::string& type, const NameVarBaseMap& ins,
 void Tracer::TraceOp(const std::string& type, const NameVarBaseMap& ins,
                      const NameVarBaseMap& outs,
                      framework::AttributeMap attrs) {
-  TraceOp(type, ins, outs, std::move(attrs), expected_place_, no_grad_);
+  TraceOp(type, ins, outs, std::move(attrs), expected_place_, has_grad_);
 }
 
 bool Tracer::ComputeRequiredGrad(const NameVarBaseMap& ins,

paddle/fluid/imperative/tracer.h

@@ -86,9 +86,9 @@ class Tracer {
 
   void SetExpectedPlace(platform::Place place) { expected_place_ = place; }
 
-  bool NoGrad() const { return no_grad_; }
+  bool HasGrad() const { return has_grad_; }
 
-  void SetNoGrad(bool no_grad) { no_grad_ = no_grad; }
+  void SetHasGrad(bool has_grad) { has_grad_ = has_grad; }
 
  private:
   std::unique_ptr<BasicEngine> basic_engine_;
@@ -96,7 +96,7 @@ class Tracer {
   bool enable_program_desc_tracing_{false};
   std::unique_ptr<UniqueNameGenerator> generator_;
   platform::Place expected_place_;
-  bool no_grad_{false};
+  bool has_grad_{true};
 };
 
 // To access static variable current_tracer

paddle/fluid/pybind/imperative.cc

@@ -695,8 +695,8 @@ void BindImperative(py::module *m_ptr) {
       .def_property("_enable_program_desc_tracing",
                     &imperative::Tracer::IsProgramDescTracingEnabled,
                     &imperative::Tracer::SetEnableProgramDescTracing)
-      .def_property("_train_mode", &imperative::Tracer::NoGrad,
-                    &imperative::Tracer::SetNoGrad)
+      .def_property("_train_mode", &imperative::Tracer::HasGrad,
+                    &imperative::Tracer::SetHasGrad)
       .def_property(
           "_expected_place",
           [](const imperative::Tracer &self) -> py::object {