code: def forward(self, net: Tensor) -> Tensor:
      net = net[:, 0]
      net = self.linear(net)
      net = self.activation(net)
      return net
  
file_path: carefree-learn/cflearn/modules/blocks/mixed_stacks/poolers.py
imports: import torch
  import torch.nn
  import torch.nn.functional
  from torch import Tensor
  from typing import List
  from typing import Optional
  from torch.nn import Module
  from ..customs import Linear
label_desc: Use image node_id 2 for calling the BertPooler obj's underlying member method code with example usage: obj.forward(net) and returns: net