pytorch固定部分参数
不用梯度
如果是Variable,则可以初始化时指定
j = Variable(torch.randn(5,5), requires_grad=True)
但是如果是m = nn.Linear(10,10)
是没有requires_grad
传入的
for i in m.parameters(): i.requires_grad=False
另外一个小技巧就是在nn.Module里,可以在中间插入这个
for p in self.parameters(): p.requires_grad=False # eg 前面的参数就是False,而后面的不变 class Net(nn.Module): def __init__(self): super(Net, self).__init__() self.conv1 = nn.Conv2d(1, 6, 5) self.conv2 = nn.Conv2d(6, 16, 5) for p in self.parameters(): p.requires_grad=False self.fc1 = nn.Linear(16 * 5 * 5, 120) self.fc2 = nn.Linear(120, 84) self.fc3 = nn.Linear(84, 10)
def freeze(test_net): ct = 0 for child in test_net.children(): ct += 1 if ct < 3: for param in child.parameters(): param.requires_grad = False
过滤
optimizer.SGD(filter(lambda p: p.requires_grad, model.parameters()), lr=1e-3)
来源:https://www.cnblogs.com/icodeworld/p/12025075.html