src/transformers/models/bridgetower/modeling_bridgetower.py/BridgeTowerModel/get_cls_features
class BridgeTowerModel:    def get_cls_features(self, text_features, image_features):
        cls_features_text = self.cross_modal_text_pooler(text_features)
        cls_features_image = self.cross_modal_image_pooler(image_features)
        return torch.cat([cls_features_text, cls_features_image], dim=-1)