损失函数softmax_cross_entropy、binary_cross_entropy、sigmoid_cross_entropy之间的区别与联系

参考文章

https://www.jianshu.com/p/47172eb86b39

https://www.cnblogs.com/guqiangjs/p/8202899.html

https://blog.csdn.net/xiamentingtao/article/details/78598511

https://blog.csdn.net/qinghuaci666/article/details/80900882

https://www.zhihu.com/question/36307214

https://www.cnblogs.com/laurdawn/p/5841192.html