class_docstr: This class handles iteration events to print output to the console.
docstr: Printing iteration message with ``tf.logging`` interface.
  
  :param _sender:
  :param msg: an iteration message instance
  :return:
docstr_tok: ["Printing","iteration","message","with","``","tf.logging","``","interface",".",":","param","_sender",":",":","param","msg",":","an","iteration","message","instance",":","return",":"]
code: def print_console_vars(self, _sender, **msg):
      """
      Printing iteration message with ``tf.logging`` interface.
  
      :param _sender:
      :param msg: an iteration message instance
      :return:
      """
      tf.logging.info(msg["iter_msg"].to_console_string())
  
imports: import tensorflow
  from niftynet.engine.application_variables import CONSOLE
  from niftynet.engine.signal import ITER_STARTED, ITER_FINISHED
label_desc: Use image node_id 3 for calling the ConsoleLogger obj's underlying member method code with example usage: obj.print_console_vars(_sender) without return types