code: def num_spk(self):
      return self._num_spk
  
file_path: espnet/espnet2/enh/separator/dccrn_separator.py
imports: from collections import OrderedDict
  from typing import Dict, List, Optional, Tuple, Union
  import torch
  import torch.nn
  import torch.nn.functional
  from packaging.version import parse
  from torch_complex.tensor import ComplexTensor
  from espnet2.enh.layers.complexnn import ComplexBatchNorm, ComplexConv2d, ComplexConvTranspose2d, NavieComplexLSTM, complex_cat
  from espnet2.enh.separator.abs_separator import AbsSeparator
label_desc: Use image node_id 6 for calling the DCCRNSeparator obj's underlying member method code with example usage: obj.num_spk() and returns: self