code: def test_tree_to_df_categorical():
      cputest = TestTreesToDataFrame()
      cputest.run_tree_to_df_categorical("gpu_hist")
  
imports: import sys
  from test_parse_tree import TestTreesToDataFrame
label_desc: Use image node_id 1 for calling a global function with example usage: test_tree_to_df_categorical() without return types