class_docstr: Energy extractor.
code: def output_size(self) -> int:
      return 1
  
file_path: espnet/espnet2/tts/feats_extract/energy.py
imports: from typing import Any, Dict, Tuple, Union
  import humanfriendly
  import torch
  import torch.nn.functional
  from typeguard import check_argument_types
  from espnet2.layers.stft import Stft
  from espnet2.tts.feats_extract.abs_feats_extract import AbsFeatsExtract
  from espnet.nets.pytorch_backend.nets_utils import pad_list
label_desc: Use image node_id 2 for calling the Energy obj's underlying member method code with example usage: obj.output_size() and returns: int