code: def test_split_value_histograms():
      cputest = TestTreesToDataFrame()
      cputest.run_split_value_histograms("gpu_hist")
  
imports: import sys
  from test_parse_tree import TestTreesToDataFrame
label_desc: Use image node_id 2 for calling a global function with example usage: test_split_value_histograms() without return types