后半部分亦然,当期望值yi 为0,p(yi)越接近1, 则1-p(yi)约接近0. 在pytorch中,对应的函数为torch.nn.BCELossWithLogits和torch.nn.BCELoss https://towardsdatascience.com/understanding-binary-cross-entropy-log-loss-a-visual-explanation-a3ac6025181a...
binary_cross_entropy_with_logits: input = torch.randn(3, requires_grad=True) target = torch.empty(3).random_(2) loss = F.binary_cross_entropy_with_logits(input, target) loss.backward() # input is tensor([ 1.3210, -0.0636, 0.8165], requires_grad=True) # target is tensor([0., 1....
https://www.cnblogs.com/wangguchangqing/p/12068084.html 这个链接也比较详细
最近在做目标检测,其中关于置信度和类别的预测都用到了F.binary_cross_entropy,这个损失不是经常使用,于是去pytorch 手册看了一下定义。如图。 其中t为标签,只包含0,1,o为输入,包含0～1的小数,两者具有相同的尺寸。 输入两组数据,计算 按照公式可以计算得, 两者结果一致。 根据计算公式,显然可以知道,损失的优化...
2.Categorical cross-entropy p are the predictions, t are the targets, i denotes the data point and j denotes the class. 适用于多分类问题,并使用softmax作为输出层的激活函数的情况。 This is the loss function of choice formulti-class classification problemsandsoftmax output units. For hard target...
torch 对应的function kl_div cross_entropy binary_cross_entropy 交叉熵 二分类交叉熵 kl散度 注意kl散度 和公式中的有点不一样 log_target:一个布尔值,指定是否对target输入应用对数。如果为False,则计算方式为P * (log(P) - Q);如果为True,则计算方式为P * (P - log(Q))。
binary_cross_entropy loss 在使用 CUDA 时出错怎么解决? 如何避免在使用 CUDA 计算 binary_cross_entropy loss 时出现断言错误? A CUDA assertion error pops up when setting --no_lsgan. It seems it's because there are negative values thrown into the nn.BCELoss(). Get's fixed applying nn.BCEWith...
The classifier is trained by minimizing a binary cross-entropy loss (Eq. (9.4)), which can be defined in PyTorch as follows: Sign in to download full-size image Show moreView chapter Book 2024, Machine Learning for Biomedical ApplicationsMaria Deprez, Emma C. Robinson Chapter Object ...
sigmoid搭配binary cross entropy loss（两个操作合起来在Pytorch里有BCEWithLogitsLoss），最常用于二分类...
We demonstrate our loss function's usefulness on Fashion MNIST, CIFAR-10, CIFAR-100 datasets, where we heuristically create training data with noisy labels and achieve a nice performance boost compared to the standard binary cross-entropy. These results are also confirmed in the second experiment,...