fix consistency for pix2pix (#552)

test_tipc/test_train_inference_python.sh

@@ -247,6 +247,7 @@ else
                 fi
                 # run train
                 eval "unset CUDA_VISIBLE_DEVICES"
+                export FLAGS_cudnn_deterministic=True
                 eval $cmd
                 echo $cmd
                 status_check $? "${cmd}" "${status_log}"