Sequential#
- class torch.nn.modules.container.Sequential(*args: Module)[原始碼]#
- class torch.nn.modules.container.Sequential(arg: OrderedDict[str, Module])
一個順序容器。
模組將按照在建構函式中傳遞的順序新增到其中。或者,也可以傳入一個模組的
OrderedDict。Sequential的forward()方法接受任何輸入,並將其轉發給它包含的第一個模組。然後,它將為每個後續模組依次“連結”輸出到輸入,最後返回最後一個模組的輸出。與手動呼叫一系列模組相比,
Sequential提供的優勢在於,它允許將整個容器視為一個單獨的模組,這樣對Sequential執行的轉換將應用於它儲存的每個模組(這些模組都是Sequential的註冊子模組)。那麼
Sequential和torch.nn.ModuleList有什麼區別呢?ModuleList正如其名——一個用於儲存Module的列表!另一方面,Sequential中的層以級聯的方式連線。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)[原始碼]#
將給定的模組附加到末尾。
- 引數
module (nn.Module) – 要附加的模組
- 返回型別
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)[原始碼]#
使用另一個 Sequential 容器中的層擴充套件當前 Sequential 容器。
- 引數
sequential (Sequential) – 要新增到當前容器的 Sequential 容器。
- 返回型別
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)[原始碼]#
將模組插入到指定索引的 Sequential 容器中。
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) )