l o g l o s s = − 1 N ∑ i = 1 N ∑ j = 1 M y i j l o g ( p i j ) logloss=-\frac{1}{N}\sum \limits_{i=1}^N \sum \limits_{j=1}^M y_{ij}log (p_{ij}) logloss=−N1i=1∑Nj=1∑Myijlog(pij)
单个样本的Log Loss如下所示： − ( y i ∗ l o g ( p i ) + ( 1 − y i ) ∗ l o g ( 1 − p i ) ) -(y_i*log(p_i)+ (1-y_i)*log(1-p_i)) −(yi∗log(pi)+(1−yi)∗log(1−pi))