code: def forward(self, seq):
      nw = F.softmax(self.w, dim=0)
      seq = torch.mul(seq, nw)
      seq = torch.sum(seq, dim=0)
      return seq
  
imports: import torch
  import torch.nn.functional
  from torch import nn
  from utils import get_length, INF
label_desc: Use image node_id 2 for calling the LinearCombine obj's underlying member method code with example usage: obj.forward(seq) and returns: seq