kernel.py 文件源码

def _hilbert_dot(x, y, scalar=1.0):
    # return ``2 * safe_sparse_dot(x, y) - safe_sparse_dot(x, x.T) - safe_sparse_dot(y, y.T)``
    x, y = x.astype(np.double, order='C'), y.astype(np.double, order='C')
    return _hilbert_dot_fast(x, y, scalar)