class_docstr: Set the audio buffer to a fixed length.
code: def __repr__(self) -> str:
      return f"{self.__class__.__name__}(length={self.length})"
  
imports: import argparse
  import math
  import pathlib
  import random
  from typing import Callable, Dict, List, Optional, Union
  import torch
  import torchaudio
  from data.transforms import TRANSFORMATIONS_REGISTRY, BaseTransformation
  from data.transforms.audio_aux import mfccs
label_desc: Use image node_id 4 for calling the SetFixedLength obj's underlying member method code with example usage: obj.__repr__() and returns: self, str, self, str