code: def test_gpu_hist_basic():
      assert_constraint(1, "gpu_hist")
      assert_constraint(-1, "gpu_hist")
  
file_path: xgboost/tests/python-gpu/test_monotonic_constraints.py
imports: import sys
  import numpy
  import pytest
  import xgboost
  from xgboost import testing
  import test_monotone_constraints
label_desc: Use image node_id 4 for calling a global function with example usage: test_gpu_hist_basic() without return types