class_docstr: This measurement returns the average number of words in the input string(s).
code: def _download_and_prepare(self, dl_manager):
      import nltk
  
      nltk.download("punkt")
  
file_path: evaluate/measurements/word_length/word_length.py
imports: from statistics import mean
  import datasets
  from nltk import word_tokenize
  import evaluate
label_desc: Use image node_id 2 for calling the WordLength obj's underlying member method code with example usage: obj._download_and_prepare(dl_manager) without return types