code: def get_batch(source, i, seq_len):
      seq_len = min(seq_len, source.size(1) - 1 - i)
      data = source[:, i : i + seq_len]
      target = source[:, i + 1 : i + 1 + seq_len].reshape(-1)
      return data, target
  
imports: import argparse
  from copy import copy
  import logging
  import lzma
  import math
  import os
  import random
  import time
  from types import GeneratorType
  import numpy
  import torch
  from stanza.models.common.char_model import build_charlm_vocab, CharacterLanguageModel, CharacterLanguageModelTrainer
  from stanza.models.common.vocab import CharVocab
  from stanza.models.common import utils
  from stanza.models import _training_logging
label_desc: Use image node_id 3 for calling a global function with example usage: get_batch(source, i, seq_len) and returns: data,  target