fix style bug, test=develop

paddle/fluid/operators/bpr_loss_op.cc

@@ -28,12 +28,12 @@ class BprLossOp : public framework::OperatorWithKernel {
     PADDLE_ENFORCE(ctx->HasOutput("Y"), "Output(Y) should be not null.");
 
     auto x_dims = ctx->GetInputDim("X");
-    auto label_Pos_dims = ctx->GetInputDim("LabelPos");
+    auto label_pos_dims = ctx->GetInputDim("LabelPos");
     int rank = x_dims.size();
-    PADDLE_ENFORCE_EQ(rank, label_Pos_dims.size(),
+    PADDLE_ENFORCE_EQ(rank, label_pos_dims.size(),
                       "Input(X) and Input(LabelPos) shall have the same rank.");
     PADDLE_ENFORCE_EQ(framework::slice_ddim(x_dims, 0, rank - 1),
-                      framework::slice_ddim(label_Pos_dims, 0, rank - 1),
+                      framework::slice_ddim(label_pos_dims, 0, rank - 1),
                       "Input(X) and Input(LabelPos) shall have the same shape "
                       "except the last dimension.");