def purge(root=os.path.join(base.data_dir(), 'models')):
    r"""Purge all pretrained model files in local file store.

    Parameters
    ----------
    root : str, default '$MXNET_HOME/models'
        Location for keeping the model parameters.
    """
    root = os.path.expanduser(root)
    files = os.listdir(root)
    for f in files:
        if f.endswith(".params"):
            os.remove(os.path.join(root, f))
r"""Purge all pretrained model files in local file store.

    Parameters
    ----------
    root : str, default '$MXNET_HOME/models'
        Location for keeping the model parameters.