Sequential#
- class torch.nn.Sequential(*args: Module)[来源]#
- class torch.nn.Sequential(arg: OrderedDict[str, Module])
一个顺序容器。
模块将按照它们在构造函数中传递的顺序被添加到容器中。或者,也可以传入一个模块的
OrderedDict。Sequential的forward()方法接收任何输入,并将其转发给它包含的第一个模块。然后,它将输出依次作为输入传递给后续的每一个模块,最后返回最后一个模块的输出。与手动调用一系列模块相比,
Sequential提供的优势在于它允许将整个容器视为单个模块,因此对Sequential执行的转换会应用于它所存储的每个模块(每个模块都是Sequential的注册子模块)。Sequential和torch.nn.ModuleList有什么区别?ModuleList顾名思义就是一个用于存储Module的列表!另一方面,Sequential中的层是以级联的方式连接在一起的。示例
# Using Sequential to create a small model. When `model` is run, # input will first be passed to `Conv2d(1,20,5)`. The output of # `Conv2d(1,20,5)` will be used as the input to the first # `ReLU`; the output of the first `ReLU` will become the input # for `Conv2d(20,64,5)`. Finally, the output of # `Conv2d(20,64,5)` will be used as input to the second `ReLU` model = nn.Sequential( nn.Conv2d(1, 20, 5), nn.ReLU(), nn.Conv2d(20, 64, 5), nn.ReLU() ) # Using Sequential with OrderedDict. This is functionally the # same as the above code model = nn.Sequential( OrderedDict( [ ("conv1", nn.Conv2d(1, 20, 5)), ("relu1", nn.ReLU()), ("conv2", nn.Conv2d(20, 64, 5)), ("relu2", nn.ReLU()), ] ) )
- append(module)[来源]#
将给定的模块追加到末尾。
- 参数:
module (nn.Module) – 要附加的模块
- 返回类型:
自我
示例
>>> import torch.nn as nn >>> n = nn.Sequential(nn.Linear(1, 2), nn.Linear(2, 3)) >>> n.append(nn.Linear(3, 4)) Sequential( (0): Linear(in_features=1, out_features=2, bias=True) (1): Linear(in_features=2, out_features=3, bias=True) (2): Linear(in_features=3, out_features=4, bias=True) )
- extend(sequential)[来源]#
使用来自另一个 Sequential 容器的层来扩展当前的 Sequential 容器。
- 参数:
sequential (Sequential) – 一个 Sequential 容器,其层将被添加到当前容器中。
- 返回类型:
自我
示例
>>> import torch.nn as nn >>> n = nn.Sequential(nn.Linear(1, 2), nn.Linear(2, 3)) >>> other = nn.Sequential(nn.Linear(3, 4), nn.Linear(4, 5)) >>> n.extend(other) # or `n + other` Sequential( (0): Linear(in_features=1, out_features=2, bias=True) (1): Linear(in_features=2, out_features=3, bias=True) (2): Linear(in_features=3, out_features=4, bias=True) (3): Linear(in_features=4, out_features=5, bias=True) )
- insert(index, module)[来源]#
在指定的索引处向 Sequential 容器插入一个模块。
示例
>>> import torch.nn as nn >>> n = nn.Sequential(nn.Linear(1, 2), nn.Linear(2, 3)) >>> n.insert(0, nn.Linear(3, 4)) Sequential( (0): Linear(in_features=3, out_features=4, bias=True) (1): Linear(in_features=1, out_features=2, bias=True) (2): Linear(in_features=2, out_features=3, bias=True) )