code: def test_unindex(self):
      self.blocker.index(self.fields_2.values(), "name")
      self.blocker.unindex(self.fields_2.values(), "name")
  
      blocks = defaultdict(set)
  
      for block_key, record_id in self.blocker(self.records_1.items()):
          blocks[block_key].add(record_id)
  
      assert len(blocks.values()) == 0
  
file_path: dedupe/tests/test_blocking.py
imports: import unittest
  from collections import defaultdict
  import dedupe
label_desc: Use image node_id 4 for calling the TfIndexUnindex obj's underlying member method code with example usage: obj.test_unindex() without return types