code: def recall(retrieved, relevant):
      return float(len(set(relevant) & set(retrieved))) / float(
          len(set(relevant))
      )
  
file_path: annoy/test/dot_index_test.py
imports: import random
  import numpy
  import pytest
  from annoy import AnnoyIndex
label_desc: Use image node_id 2 for calling a global function with example usage: recall(retrieved, relevant) and returns: unknown