(bugfix):dropout little mistake

lite/kernels/mlu/bridges/dropout_op.cc

@@ -61,8 +61,8 @@ int DropoutConverter(void* ctx, OpLite* op, KernelBase* kernel) {
   auto beta_tensor = graph->AddNode(
       beta_var_name, shape, CNML_CONST, CNML_NHWC, graph->FPType());
 
-  graph->BindConstRawData("Alpha" + prefix, &alpha, 1);
-  graph->BindConstRawData("Beta" + prefix, &beta, 1);
+  graph->BindConstRawData(alpha_var_name, &alpha, 1);
+  graph->BindConstRawData(beta_var_name, &beta, 1);
 
   auto input_tensor = graph->GetNode(x_var_name);
   cnmlBaseOp_t scale_op;

lite/kernels/mlu/bridges/dropout_op_test.cc

@@ -85,9 +85,9 @@ void test_dropout(int bs,
   opdesc.SetAttr("seed", seed);
   opdesc.SetAttr("dropout_implementation", dropout_implementation);
   opdesc.SetAttr("dropout_prob", dropout_prob);
-  VLOG(6) << "mask: " << mask->dims()[0] << std::endl;
   // create and convert op to MLU model, then run it on MLU
   auto op = CreateOp<operators::DropoutOp>(opdesc, &scope);
+  VLOG(6) << "mask: " << mask << std::endl;
   dropout_ref(op);
   out_ref->CopyDataFrom(*out);