optimize code

paddle/framework/block_desc.cc

@@ -35,8 +35,7 @@ VarDescBind *BlockDescBind::Var(const std::string &name) const {
 }
 
 bool BlockDescBind::HasVar(const std::string &name) const {
-  auto it = vars_.find(name);
-  return it != vars_.end();
+  return vars_.find(name) != vars_.end();
 }
 
 std::vector<VarDescBind *> BlockDescBind::AllVars() const {

paddle/framework/shape_inference.h

@@ -19,6 +19,9 @@ limitations under the License. */
 namespace paddle {
 namespace framework {
 
+// TODO(longfei): Once after both CompileTimeInferShapeContext and
+// RuntimeInferShapeContext get merged, we can rename InferShapeContextBase into
+// InferShapeContext so to replace the current InferShapeContext.
 class InferShapeContextBase {
  public:
   virtual ~InferShapeContextBase() {}