code: def output_size(self) -> int:
      raise NotImplementedError
  
file_path: espnet/espnet2/tts/feats_extract/abs_feats_extract.py
imports: from abc import ABC, abstractmethod
  from typing import Any, Dict, Tuple
  import torch
label_desc: Use image node_id 1 for calling the AbsFeatsExtract obj's underlying member method code with example usage: obj.output_size() without return types