code: def forward(
      self,
      input,
      ilens,
      bottleneck_feat,
      num_spk,
  ) -> Tuple[Tuple[torch.Tensor], torch.Tensor, OrderedDict]:
      raise NotImplementedError
  
file_path: espnet/espnet2/diar/layers/abs_mask.py
imports: from abc import ABC, abstractmethod
  from collections import OrderedDict
  from typing import Tuple
  import torch
label_desc: Use image node_id 2 for calling the AbsMask obj's underlying member method code with example usage: obj.forward(input, ilens, bottleneck_feat, num_spk) without return types