__init__.py 文件源码

def safe_mask(X, mask):
    """Return a mask which is safe to use on X.

    Parameters
    ----------
    X : {array-like, sparse matrix}
        Data on which to apply mask.

    mask: array
        Mask to be used on X.

    Returns
    -------
        mask
    """
    mask = np.asarray(mask)
    if np.issubdtype(mask.dtype, np.int):
        return mask

    if hasattr(X, "toarray"):
        ind = np.arange(mask.shape[0])
        mask = ind[mask]
    return mask