code: def test_graph_data_loader_get_data_size(graph_data_loader):
      size = graph_data_loader.get_data_size()
      assert size == 6, "Size is not equal to 5"
  
file_path: AmpliGraph/tests/ampligraph/datasets/test_graph_data_loader.py
imports: from ampligraph.datasets import GraphDataLoader, NoBackend
  from ampligraph.datasets.sqlite_adapter import SQLiteAdapter
  import pytest
  import numpy
  import pandas
label_desc: Use image node_id 4 for calling a global function with example usage: test_graph_data_loader_get_data_size(graph_data_loader) without return types