code: def create_trainer(self, mode, config):
      learner = self.create_distributed_learner(mode, config)
      self.trainer = (
          C.Trainer(self.z, (self.z, None), learner, [])
          if learner
          else None
      )
  
imports: import argparse
  import collections
  import os
  import pickle
  import pytest
  import re
  import signal
  import subprocess
  import sys
  import time
  import numpy
  import cntk
label_desc: Use image node_id 3 for calling the SimpleTrainer obj's underlying member method code with example usage: obj.create_trainer(mode, config) without return types