code: def __call__(self, trainer):
      attn_dict, uttid_list = self.get_attention_weights()
      suffix = "ep.{.updater.epoch}.png".format(trainer)
      self.plotfn(
          self.data_dict,
          uttid_list,
          attn_dict,
          self.outdir,
          suffix,
          savefig,
      )
  
file_path: espnet/espnet/nets/pytorch_backend/transformer/plot.py
imports: import logging
  import os
  import numpy
  from espnet.asr import asr_utils
label_desc: Use image node_id 2 for calling the PlotAttentionReport obj's underlying member method code with example usage: obj.__call__(trainer) without return types