code: def overlap_ratios(a: set, b: set) -> float:
      """
      Calculates the Jacard distance between two sets.
      """
      overlap = a.intersection(b)
      union = a.union(b)
      return len(overlap) / (len(union) + 0.001)
  
file_path: ParlAI/parlai/crowdsourcing/projects/wizard_of_internet/acceptability.py
imports: import numpy
  from typing import Iterable, List
  from nltk.stem import PorterStemmer
  from parlai.crowdsourcing.utils.acceptability import AcceptabilityChecker, normalize_answer
  import parlai.utils.logging
label_desc: Use image node_id 2 for calling a global function with example usage: overlap_ratios(a, b) and returns: unknown