code: def num_spk(self):
      return self._num_spk
  
file_path: espnet/espnet2/enh/separator/fasnet_separator.py
imports: from collections import OrderedDict
  from typing import Dict, List, Optional, Tuple
  import torch
  from packaging.version import parse
  from espnet2.enh.layers.fasnet import FaSNet_TAC
  from espnet2.enh.layers.ifasnet import iFaSNet
  from espnet2.enh.separator.abs_separator import AbsSeparator
label_desc: Use image node_id 3 for calling the FaSNetSeparator obj's underlying member method code with example usage: obj.num_spk() and returns: self