code: def test_roc_auc_multi(self, n_samples, weighted):
      self.cpu_test.run_roc_auc_multi("gpu_hist", n_samples, weighted)
  
file_path: xgboost/tests/python-gpu/test_gpu_eval_metrics.py
imports: import json
  import sys
  import pytest
  import xgboost
  from xgboost import testing
  from xgboost.testing.metrics import check_precision_score, check_quantile_error
  import test_eval_metrics
label_desc: Use image node_id 2 for calling the TestGPUEvalMetrics obj's underlying member method code with example usage: obj.test_roc_auc_multi(n_samples, weighted) without return types