moments.py 文件源码

def _M2_sparse(Xvar, mask_X, Yvar, mask_Y, weights=None):
    """ 2nd moment matrix exploiting zero input columns """
    C = np.zeros((len(mask_X), len(mask_Y)))
    C[np.ix_(mask_X, mask_Y)] = _M2_dense(Xvar, Yvar, weights=weights)
    return C