code: def train_error(self, network, **data):
      self.last_train_error = data["value"]
  
imports: from __future__ import unicode_literals
  import time
  import progressbar
  from neupy.utils import iters
label_desc: Use image node_id 3 for calling the ProgressbarSignal obj's underlying member method code with example usage: obj.train_error(network) without return types