class_docstr: Conventional frontend structure for ASR
  
  Stft -> log-amplitude-spec
code: def output_size(self) -> int:
      return self.n_fft // 2 + 1
  
file_path: espnet/espnet2/s2st/tgt_feats_extract/log_spectrogram.py
imports: from typing import Any, Dict, Optional, Tuple
  import torch
  from typeguard import check_argument_types
  from espnet2.layers.stft import Stft
  from espnet2.s2st.tgt_feats_extract.abs_tgt_feats_extract import AbsTgtFeatsExtract
label_desc: Use image node_id 2 for calling the LogSpectrogram obj's underlying member method code with example usage: obj.output_size() and returns: unknown