def __getitem__(self, label=None):
        if label is None:
            return self.lms.copy()
        return self._pointcloud.from_mask(self._labels_to_masks[label])
.. todo::
dataset/ETHPy150Open menpo/menpo/menpo/landmark/base.py/LandmarkGroup.__getitem__--crossover with--dataset/ETHPy150Open lisa-lab/pylearn2/pylearn2/packaged_dependencies/theano_linear/unshared_conv/localdot.py/LocalDot.rmul