code: def check_not_intersect(chunk_list):
      test_set = set()
      total_size = 0
      for tests in chunk_list:
          total_size += len(tests)
          test_set.update(tests)
      return total_size == len(test_set)
  
file_path: catboost/library/python/testing/yatest_lib/tests/test_testsplitter.py
imports: from yatest_lib import test_splitter
label_desc: Use image node_id 2 for calling a global function with example usage: check_not_intersect(chunk_list) and returns: unknown