code: def pad_sequence_to_length(
      sequence,
      desired_length,
      default_value=lambda: 0,
      padding_on_right=True,
  ):
      """
      Take a list of objects and pads it to the desired length, returning the padded list.  The
      original list is not modified.
  
      Parameters
      ----------
      sequence : List
          A list of objects to be padded.
  
      desired_length : int
          Maximum length of each sequence. Longer sequences are truncated to this length, and
          shorter ones are padded to it.
  
      default_value: Callable, default=lambda: 0
          Callable that outputs a default value (of any type) to use as padding values.  This is
          a lambda to avoid using the same object when the default value is more complex, like a
          list.
  
      padding_on_right : bool, default=True
          When we add padding tokens (or truncate the sequence), should we do it on the right or
          the left?
  
      Returns
      -------
      padded_sequence : List
      """
      # Truncates the sequence to the desired length.
      if padding_on_right:
          padded_sequence = sequence[:desired_length]
      else:
          padded_sequence = sequence[-desired_length:]
      # Continues to pad with default_value() until we reach the desired length.
      for _ in range(desired_length - len(padded_sequence)):
          if padding_on_right:
              padded_sequence.append(default_value())
          else:
              padded_sequence.insert(0, default_value())
      return padded_sequence
  
imports: from __future__ import division
  from __future__ import absolute_import
  import importlib
  import logging
  import pkgutil
  import random
  import subprocess
  import sys
  import os
  import torch
  import numpy
  import spacy
  from spacy.cli.download import download
  from spacy.language import Language
  import allennlp
  from allennlp.common.checks import log_pytorch_version_info
  from allennlp.common.params import Params
  from allennlp.common.tqdm import Tqdm
  from allennlp.common.tee_logger import TeeLogger
label_desc: Use image node_id 4 for calling a global function with example usage: pad_sequence_to_length(sequence, desired_length, default_value, padding_on_right) and returns: padded_sequence