Looks for the name of abstracted layer.
    Usually these layers appears when model is stacked.
    :return: List of abstracted layers

def _get_abstract_layer_name(self):
    """
    Looks for the name of abstracted layer.
    Usually these layers appears when model is stacked.
    :return: List of abstracted layers
    """
    abstract_layers = []
    for layer in self.model.layers:
      if 'layers' in layer.get_config():
        abstract_layers.append(layer.name)

    return abstract_layers