code: def test_global_flatten_bin_sizes(self, histogram_indexer):
      # Test if the global flatten bin sizes is correctly calculated
      assert (
          histogram_indexer.global_flatten_bin_sizes()
          == histogram_indexer.feature_bin_sizes
          * histogram_indexer.node_size
      )
  
file_path: FATE/python/fate/test/histogram/indexer.py
imports: import pytest
  from fate_utils.histogram import HistogramIndexer, Shuffler
label_desc: Use image node_id 9 for calling the TestHistogramIndexer obj's underlying member method code with example usage: obj.test_global_flatten_bin_sizes(histogram_indexer) without return types