code: def is_prefix(x: List[int], pref: List[int]) -> bool:
      """Check if pref is a prefix of x.
  
      Args:
          x: Label ID sequence.
          pref: Prefix label ID sequence.
  
      Returns:
          : Whether pref is a prefix of x.
  
      """
      if len(pref) >= len(x):
          return False
  
      for i in range(len(pref) - 1, -1, -1):
          if pref[i] != x[i]:
              return False
  
      return True
  
file_path: espnet/espnet/nets/pytorch_backend/transducer/utils.py
imports: import os
  from typing import Any, Dict, List, Optional, Union
  import numpy
  import torch
  from espnet.nets.pytorch_backend.nets_utils import pad_list
  from espnet.nets.transducer_decoder_interface import ExtendedHypothesis, Hypothesis
label_desc: Use image node_id 3 for calling a global function with example usage: is_prefix(x, pref) and returns: True, False, False