code: def __init__(self):
      self.data = defaultdict(dict)
  
file_path: espnet/test/test_tensorboard.py
imports: from collections import defaultdict
  import chainer
  import numpy
  from espnet.utils.training.evaluator import BaseEvaluator
  from espnet.utils.training.tensorboard_logger import TensorboardLogger
label_desc: Use image node_id 1 to create a new DummyWriter object  with example: obj = DummyWriter()