def __getitem__(self, label=None):
        """
        Returns the PointCloud that contains this label represents on the group.
        This will be a subset of the total landmark group PointCloud.

        Parameters
        ----------
        label : `string`
            Label to filter on.

        Returns
        -------
        pcloud : :map:`PointCloud`
            The PointCloud that this label represents. Will be a subset of the
            entire group's landmarks.
        """
        if label is None:
            return self.lms.copy()
        return self._pointcloud.from_mask(self._labels_to_masks[label])
dataset/ETHPy150Open menpo/menpo/menpo/landmark/base.py/LandmarkGroup.__getitem__/original