Style fix

Author: ktlichkid

paddle/fluid/operators/beam_search_op.cc

@@ -254,7 +254,6 @@ class BeamSearchOp : public framework::OperatorWithKernel {
   }
 };
 
-
 class BeamSearchInferVarType : public framework::VarTypeInference {
  public:
   void operator()(const framework::OpDesc &op_desc,
@@ -271,7 +270,6 @@ class BeamSearchInferVarType : public framework::VarTypeInference {
 }  // namespace operators
 }  // namespace paddle
 
-
 namespace ops = paddle::operators;
 
 REGISTER_OPERATOR(beam_search, ops::BeamSearchOp, ops::BeamSearchOpMaker,