code: def num_spk(self):
      return None
  
file_path: espnet/espnet2/diar/separator/tcn_separator_nomask.py
imports: from distutils.version import LooseVersion
  from typing import Tuple, Union
  import torch
  from torch_complex.tensor import ComplexTensor
  from espnet2.diar.layers.tcn_nomask import TemporalConvNet
  from espnet2.enh.layers.complex_utils import is_complex
  from espnet2.enh.separator.abs_separator import AbsSeparator
label_desc: Use image node_id 4 for calling the TCNSeparatorNomask obj's underlying member method code with example usage: obj.num_spk() and returns: None