eqlm.py 文件源码

def delta(u, v):
    """ cosine ° sigmoid
    >>> delta([0.2], [0.3])
    0.5
    >>> delta([0.3], [0.2])
    0.5
    >>> delta([0.1,0.9], [-0.9,0.1]) == delta([-0.9,0.1], [0.1,0.9])
    True
    """
    # TODO scale with a and c
    return expit(cosine(u, v))