fix bug (#32135)

python/paddle/fluid/tests/unittests/test_parallel_dygraph_dataparallel.py

@@ -18,7 +18,7 @@ import unittest
 import time
 import paddle.fluid as fluid
 
-from paddle.distributed.utils import find_free_ports, watch_local_trainers, get_cluster, get_gpus, start_local_trainers
+from paddle.distributed.utils import find_free_ports, watch_local_trainers, get_cluster, start_local_trainers
 
 
 def get_cluster_from_args(selected_gpus):
@@ -41,6 +41,11 @@ def get_cluster_from_args(selected_gpus):
     return get_cluster(node_ips, node_ip, trainer_endpoints, selected_gpus)
 
 
+def get_gpus(selected_gpus):
+    selected_gpus = [x.strip() for x in selected_gpus.split(',')]
+    return selected_gpus
+
+
 class TestMultipleGpus(unittest.TestCase):
     def run_mnist_2gpu(self, target_file_name):
         if not fluid.core.is_compiled_with_cuda(