def _get_coarse_point_feats(self, prev_output, points):
        """
        Sample from fine grained features.

        Args:
            prev_output (list[Tensor]): Prediction of previous decode head.
            points (Tensor): Point coordinates, shape (batch_size,
                num_points, 2).
        Returns:
            coarse_feats (Tensor): Sampled coarse feature, shape (batch_size,
                num_classes, num_points).
        """

        coarse_feats = point_sample(prev_output,
                                    points,
                                    align_corners=self.align_corners)
        return coarse_feats

        Sample from fine grained features.

        Args:
            prev_output (list[Tensor]): Prediction of previous decode head.
            points (Tensor): Point coordinates, shape (batch_size,
                num_points, 2).
        Returns:
            coarse_feats (Tensor): Sampled coarse feature, shape (batch_size,
                num_classes, num_points).
        
paddleseg/models/pointrend.py