code: def dummy_func(x):
      return x
  
file_path: cuml/python/cuml/tests/explainer/test_explainer_base.py
imports: from cuml import LinearRegression
  from cuml.explainer.base import SHAPBase
  from pylibraft.common.handle import Handle
  import pytest
  from cuml.internals.safe_imports import cpu_only_import
  from cuml.internals.safe_imports import gpu_only_import
label_desc: Use image node_id 4 for calling a global function with example usage: dummy_func(x) and returns: x