message: This CL adds a Keras-based mobilenet_v2 feature extractor for object detection models.
  As part of this CL, we use the Keras mobilenet_v2 application's keyword argument layer injection API to allow the generated network to support the object detection hyperparameters.
diff: @@ -63,6 +63,7 @@ def keras_modules_injection(base_fun):
  def wrapper(*args, **kwargs):
  if hasattr(keras_applications, 'get_submodules_from_kwargs'):
  kwargs['backend'] = backend
  + if 'layers' not in kwargs:
  kwargs['layers'] = layers
  kwargs['models'] = models
  kwargs['utils'] = utils
  