math_to_code.py 文件源码

def f2(w, lamb):
    """
    Eq. (2) in problem 2

    Vectorized (no explicit loops), fast
    """
    yxTw = y * X.dot(w)
    firstpart = np.log(1 + np.exp(-yxTw))
    total = firstpart.sum()
    total += (lamb / 2) * w.dot(w)
    return total