descent.py 文件源码

def SGD(a, lab, Q, reg_param):
    iterations = 1
    for i in xrange(7):
        for tau in xrange(len(a)):
            wx = ssd(a, Q[tau,:], dense_output = True)
            a = a * (1-1/iterations)
            if(lab[tau]*wx < 1):
                a[tau] = lab[tau]/(reg_param * iterations)
            iterations += 1
    return a