utils.py 文件源码

def logloss(actual, preds):
    epsilon = 1e-15
    ll = 0
    for act, pred in zip(actual, preds):
        pred = max(epsilon, pred)
        pred = min(1-epsilon, pred)
        ll += act*sp.log(pred) + (1-act)*sp.log(1-pred)
    return -ll / len(actual)