torch模拟sigmoid

收敛效果不好：

import torch


t=torch.Tensor([1,1,1,1,1,1,1,1,1,1])
x=torch.Tensor([-10,-5,-22,-0.5,1,2,3,7,8,90])

y= x.sigmoid()

print(y)

loss_fn = torch.nn.BCELoss()

loss=loss_fn(t,y)
print(loss)

print(x)


import torch

bbb=torch.clamp(x,-10,10)/20+0.5
# bbb = torch.where(x > 10, torch.full_like(x, 10), x)
# bbb = torch.where(bbb < -10, torch.full_like(bbb, -10), bbb)

print(bbb)
loss=loss_fn(t,bbb)
print(loss)