def get_inference_cond(self, cond, neg_cond=None, **kwargs):
        """
        Get the conditioning data for inference.
        """
        assert neg_cond is not None, "neg_cond must be provided for classifier-free guidance"
        return {'cond': cond, 'neg_cond': neg_cond, **kwargs}

        Get the conditioning data for inference.
        
trellis/trainers/flow_matching/mixins/classifier_free_guidance.py