code: def test_get_starting_index_rels(data_indexer):
      ind = data_indexer.backend._get_starting_index_rels()
      assert (
          ind == data_indexer.backend.rels_length
      ), "index doesn't match relations length"
  
file_path: AmpliGraph/tests/ampligraph/datasets/test_data_indexer.py
imports: from ampligraph.datasets.data_indexer import DataIndexer
  import numpy
  import pytest
label_desc: Use image node_id 10 for calling a global function with example usage: test_get_starting_index_rels(data_indexer) without return types