code: def train_start(self, network, **kwargs):
      self.first_epoch = network.last_epoch + 1
      self.last_epoch_shown = 0
  
imports: from __future__ import unicode_literals
  import time
  import progressbar
  from neupy.utils import iters
label_desc: Use image node_id 2 for calling the PrintLastErrorSignal obj's underlying member method code with example usage: obj.train_start(network) without return types