code: def exact_div(a, b, a_str, b_str, custom_error_message=""):
      q = a // b
      if a != q * b:
          raise ValueError(
              f"{custom_error_message}, {a_str}={a}, {b_str}={b}, inexact division: {a} / {b} = {a / b}"
          )
      return q
  
imports: import random
  import warnings
  from collections import deque
  from dataclasses import dataclass
  from typing import Any, Dict, List, Optional, Tuple, Union
  import numpy
  import torch
  from torch.nn.utils.rnn import pad_sequence
  from torch.utils.data import IterableDataset
  from transformers import DataCollatorForLanguageModeling, PreTrainedTokenizerBase
  from ..import_utils import is_unsloth_available
label_desc: Use image node_id 5 for calling a global function with example usage: exact_div(a, b, a_str, b_str, custom_error_message) and returns: q