def add_expand_dims(self, input_name, axis, output_name):
layer = caffe_net.LayerParameter(name=output_name, type='Unsqueeze',
bottom=[input_name], top=[output_name])
layer.unsqueeze_param(axis)
self.caffe_model.add_layer(layer)
self.data_dict[output_name] = Operators.expand_dims(self.data_dict[input_name], axis, output_name)
return output_name
