code: def test_split_value_histograms(self):
      self.run_split_value_histograms("approx")
  
file_path: xgboost/tests/python/test_parse_tree.py
imports: import numpy
  import pytest
  import xgboost
  from xgboost import testing
label_desc: Use image node_id 7 for calling the TestTreesToDataFrame obj's underlying member method code with example usage: obj.test_split_value_histograms() without return types