def causal(self):
        """bool: Whether the pose lifter is causal."""
        if hasattr(self.backbone, 'causal'):
            return self.backbone.causal
        else:
            raise AttributeError('A PoseLifter\'s backbone should have '
                                 'the bool attribute "causal" to indicate if'
                                 'it performs causal inference.')
bool: Whether the pose lifter is causal.
mmpose/mmpose/models/pose_estimators/pose_lifter.py