def METHOD_NAME(self, data, rescale=False):
    ''' model inference'''
    img_slow = data[0]
    img_fast = data[1]
    proposals = data[2]
    img_shape = data[3]
    # using slowfast model to extract spatio-temporal features
    x = self.extract_feat(img=[img_slow, img_fast])
    ret = self.roi_head.simple_test(x,
                                    proposals[0],
                                    img_shape,
                                    rescale=rescale)
    return ret