Distance.py 文件源码

def cos_distance(cls, x, y ):
        x, y = np.mat(x), np.mat(y)
        #num = float(x.dot(y.T))
        num = float(x * y.T)
        denom = la.norm(x) * la.norm(y)
        #dist = 0.5 + 0.5 * (num / denom)
        dist = 1.0 if denom == 0 else num / denom 
        return 3 * (1 - dist)