If keras_model_path is google storage url, provide util to download model

remotely.

PiperOrigin-RevId: 215295504

tensorflow/python/estimator/keras.py

@@ -368,6 +368,44 @@ def _save_first_checkpoint(keras_model, custom_objects, config):
   return latest_path
 
 
+def _get_file_from_google_storage(keras_model_path, model_dir):
+  """Get file from google storage and download to local file.
+
+  Args:
+    keras_model_path: a google storage path for compiled keras model.
+    model_dir: the directory from estimator config.
+
+  Returns:
+    The path where keras model is saved.
+
+  Raises:
+    ValueError: if storage object name does not end with .h5.
+  """
+  try:
+    from google.cloud import storage  # pylint:disable=g-import-not-at-top
+  except ImportError:
+    raise TypeError('Could not save model to Google cloud storage; please '
+                    'install `google-cloud-storage` via '
+                    '`pip install google-cloud-storage`.')
+  storage_client = storage.Client()
+  path, blob_name = os.path.split(keras_model_path)
+  _, bucket_name = os.path.split(path)
+  keras_model_dir = os.path.join(model_dir, 'keras')
+  if not gfile.Exists(keras_model_dir):
+    gfile.MakeDirs(keras_model_dir)
+  file_name = os.path.join(keras_model_dir, 'keras_model.h5')
+  try:
+    blob = storage_client.get_bucket(bucket_name).blob(blob_name)
+    blob.download_to_filename(file_name)
+  except:
+    raise ValueError('Failed to download keras model, please check '
+                     'environment variable GOOGLE_APPLICATION_CREDENTIALS '
+                     'and model path storage.googleapis.com/{bucket}/{object}.')
+  logging.info('Saving model to {}'.format(file_name))
+  del storage_client
+  return file_name
+
+
 def model_to_estimator(keras_model=None,
                        keras_model_path=None,
                        custom_objects=None,
@@ -407,12 +445,13 @@ def model_to_estimator(keras_model=None,
         'Please specity either `keras_model` or `keras_model_path`, '
         'but not both.')
 
+  config = estimator_lib.maybe_overwrite_model_dir_and_session_config(
+      config, model_dir)
   if not keras_model:
     if keras_model_path.startswith(
         'gs://') or 'storage.googleapis.com' in keras_model_path:
-      raise ValueError(
-          '%s is not a local path. Please copy the model locally first.' %
-          keras_model_path)
+      keras_model_path = _get_file_from_google_storage(keras_model_path,
+                                                       config.model_dir)
     logging.info('Loading models from %s', keras_model_path)
     keras_model = models.load_model(keras_model_path)
   else:
@@ -425,9 +464,6 @@ def model_to_estimator(keras_model=None,
         'Please compile the model with `model.compile()` '
         'before calling `model_to_estimator()`.')
 
-  config = estimator_lib.maybe_overwrite_model_dir_and_session_config(config,
-                                                                      model_dir)
-
   keras_model_fn = _create_keras_model_fn(keras_model, custom_objects)
   if _any_weight_initialized(keras_model):
     # Warn if config passed to estimator tries to update GPUOptions. If a

tensorflow/python/estimator/keras_test.py

@@ -581,12 +581,6 @@ class TestKerasEstimator(test_util.TensorFlowTestCase):
       with self.assertRaisesRegexp(ValueError, 'compiled'):
         keras_lib.model_to_estimator(keras_model=keras_model)
 
-    with self.cached_session():
-      keras_model = simple_sequential_model()
-      with self.assertRaisesRegexp(ValueError, 'not a local path'):
-        keras_lib.model_to_estimator(
-            keras_model_path='gs://bucket/object')
-
   def test_invalid_ionames_error(self):
     (x_train, y_train), (_, _) = testing_utils.get_test_data(
         train_samples=_TRAIN_SIZE,