code: def _apply_generate_function_by_type(self, f):
      if f.proto.type not in self._function_callbacks_by_type:
          return f
      return self._function_callbacks_by_type[f.proto.type](f)
  
imports: from __future__ import print_function
  import itertools
  from collections import OrderedDict
  import nnabla
  import numpy
label_desc: Use image node_id 21 for calling the NnpNetworkPass obj's underlying member method code with example usage: obj._apply_generate_function_by_type(f) and returns: self, f