code: def add_num_examples(dataset: Dataset) -> Dict[str, List[int]]:
      """Adds the total number of examples in a given dataset to
      each individual example. Must be applied to the whole dataset (i.e. `batched=True, batch_size=None`),
      otherwise the number will be incorrect.
      Args:
          dataset: a Dataset to add number of examples to
      Returns:
          Dict[str, List[int]]: total number of examples repeated for each example
      """
      num_examples = len(dataset[next(iter(dataset))])
      return {"num_examples": [num_examples] * num_examples}
  
file_path: DeepPavlov/deeppavlov/dataset_readers/huggingface_dataset_reader.py
imports: import re
  from collections import Counter
  from math import floor
  from typing import Dict, Optional, List, Union
  from datasets import load_dataset, Dataset, Features, ClassLabel, concatenate_datasets
  from deeppavlov.core.common.registry import register
  from deeppavlov.core.data.dataset_reader import DatasetReader
label_desc: Use image node_id 7 for calling a global function with example usage: add_num_examples(dataset) and returns: dict