hot fix the Native clone (#15344)

paddle/fluid/inference/api/api_impl.cc

@@ -161,13 +161,14 @@ bool NativePaddlePredictor::Run(const std::vector<PaddleTensor> &inputs,
 }
 
 std::unique_ptr<PaddlePredictor> NativePaddlePredictor::Clone() {
-  VLOG(3) << "Predictor::clone";
   std::unique_ptr<PaddlePredictor> cls(new NativePaddlePredictor(config_));
-
-  if (!dynamic_cast<NativePaddlePredictor *>(cls.get())->Init(scope_)) {
+  // Hot fix the bug that result diff in multi-thread.
+  // TODO(Superjomn) re-implement a real clone here.
+  if (!dynamic_cast<NativePaddlePredictor *>(cls.get())->Init(nullptr)) {
     LOG(ERROR) << "fail to call Init";
     return nullptr;
   }
+
 #ifdef __clang__
   // fix clang compile error
   return cls;