fix import bug

fix import bug

python/examples/pipeline/imagenet/pipeline_rpc_client.py

@@ -11,7 +11,10 @@
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
-from paddle_serving_server_gpu.pipeline import PipelineClient
+try:
+    from paddle_serving_server_gpu.pipeline import PipelineClient
+except ImportError:
+    from paddle_serving_server.pipeline import PipelineClient
 import numpy as np
 import requests
 import json