get most recent saved model to export

src/tf_container/serve.py

@@ -1,14 +1,14 @@
 #  Copyright 2018 Amazon.com, Inc. or its affiliates. All Rights Reserved.
-#  
+#
 #  Licensed under the Apache License, Version 2.0 (the "License").
 #  You may not use this file except in compliance with the License.
 #  A copy of the License is located at
-#  
+#
 #      http://www.apache.org/licenses/LICENSE-2.0
-#  
-#  or in the "license" file accompanying this file. This file is distributed 
-#  on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either 
-#  express or implied. See the License for the specific language governing 
+#
+#  or in the "license" file accompanying this file. This file is distributed
+#  on an "AS IS" BASIS, 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.
 
 import json
@@ -50,8 +50,8 @@ def export_saved_model(checkpoint_dir, model_path, s3=boto3.client('s3')):
         except KeyError as e:
             logger.error("Failed to download saved model. File does not exist in {}".format(checkpoint_dir))
             raise e
-
-        saved_model_path = saved_model_path_array[0]
+        # Select most recent saved_model.pb
+        saved_model_path = saved_model_path_array[-1]
 
         variables_path = [x['Key'] for x in contents if 'variables/variables' in x['Key']]
         variable_names_to_paths = {v.split('/').pop(): v for v in variables_path}