fix cpu build test=develop (#14260)

Author: typhoonzero

paddle/fluid/operators/ref_by_trainer_id_op.h

@@ -26,7 +26,7 @@ class RefByTrainerIdKernel : public framework::OpKernel<T> {
     auto* out = context.Output<framework::Tensor>("Out");
     auto in_list = context.MultiInput<framework::Tensor>("X");
     auto* trainer_id_t = context.Input<framework::Tensor>("TrainerId");
-    int64_t trainer_id;
+    int64_t trainer_id = 0;
     auto* trainer_id_data = trainer_id_t->data<int64_t>();
     if (platform::is_gpu_place(context.GetPlace())) {
 #ifdef PADDLE_WITH_CUDA
@@ -38,7 +38,6 @@ class RefByTrainerIdKernel : public framework::OpKernel<T> {
     } else {
       trainer_id = *trainer_id_data;
     }
-    printf("after get trainer_id %lu\n", trainer_id);
     PADDLE_ENFORCE_LT(trainer_id, in_list.size());
     out->mutable_data<T>(context.GetPlace());
     out->ShareDataWith(*(in_list[trainer_id]));

python/paddle/fluid/transpiler/distribute_transpiler.py

@@ -1588,7 +1588,6 @@ def _append_dc_asgd_ops(self, block, param_var, grad_var):
         ref_inputs = []
         for p, p_bak in self.param_bak_list:
             if p.name == param_var.name:
-                print("#### ref inputs: ", param_var.name, p_bak.name)
                 ref_inputs.append(p_bak)
         block.append_op(
             type="ref_by_trainer_id",