def determine_loader(ext):
    """Returns a loader name for a given file extension
    
    Parameters
    ----------
    ext : str
        File ending excluding the ``.``. Same as what would be returned by
        :func:`os.path.splitext`

    Returns
    -------
    name : str
        Name of the meta loader (see
        :py:mod:`~edflow.data.believers.meta_loaders` .

    Raises
    ------
    ValueError
        If the file extension cannot be handled by the implemented loaders.
        Feel free to implement you own and publish them to ``edflow``.
    """
    if ext == 'png':
        return 'image'
    elif ext == 'npy':
        return 'np'
    else:
        raise ValueError('Cannot load file with extension `{}`'.format(ext))
