今天小编就为大家分享一篇Pytorch 实现focal_loss 多类别和二分类示例，具有很好的参考价值，希望对大家有所帮助。一起跟随小编过来看看吧

我就废话不多说了，直接上代码吧！ import numpy as np import torch import torch.nn as nn import torch.nn.functional as F # 支持多分类和二分类 class FocalLoss(nn.Module): """ This is a implementation of Focal Loss with smooth label cross entropy supported which is proposed