code: def num_spk(self):
      return self._num_spk
  
file_path: espnet/espnet2/enh/separator/tcn_separator.py
imports: from collections import OrderedDict
  from typing import Dict, List, Optional, Tuple, Union
  import torch
  from packaging.version import parse
  from torch_complex.tensor import ComplexTensor
  from espnet2.enh.layers.complex_utils import is_complex
  from espnet2.enh.layers.tcn import TemporalConvNet
  from espnet2.enh.separator.abs_separator import AbsSeparator
label_desc: Use image node_id 4 for calling the TCNSeparator obj's underlying member method code with example usage: obj.num_spk() and returns: self