.add_module

import torch
torch.manual_seed(101)
seq = torch.nn.Sequential()
seq.add_module('linearaa 1', torch.nn.Linear(3, 10))
seq.add_module('linear 2', torch.nn.Linear(10,2))

ss = torch.nn.Sequential(torch.nn.Linear(3, 10), torch.nn.Linear(10, 2))
print(seq)
print(ss)

Sequential(
(linearaa 1): Linear(in_features=3, out_features=10, bias=True)
(linear 2): Linear(in_features=10, out_features=2, bias=True)
)
Sequential(
(0): Linear(in_features=3, out_features=10, bias=True)
(1): Linear(in_features=10, out_features=2, bias=True)
)