def load_features_and_arrays(prefix, mmap_mode='r'):
    """
    Returns the features and NumPy arrays that were saved with
    save_features_and_arrays.

    Parameters
    ----------

    prefix : str
        Path to where data are saved

    mmap_mode : {None, 'r+', 'r', 'w+', 'c'}
        Mode in which to memory-map the file.  See np.load for details.
    """
    features = pybedtools.BedTool(prefix + '.features')
    arrays = np.load(prefix + '.npz', mmap_mode=mmap_mode)
    return features, arrays
Returns the features and NumPy arrays that were saved with
    save_features_and_arrays.

    Parameters
    ----------

    prefix : str
        Path to where data are saved

    mmap_mode : {None, 'r+', 'r', 'w+', 'c'}
        Mode in which to memory-map the file.  See np.load for details.