code: def test_module_exists_for_tensorflow():
      """Check that module_exist returns true if tf is there."""
      pytest.importorskip("tensorflow")
      assert modules_exist("tensorflow")
  
imports: import pytest
  from sacred.optional import optional_import, get_tensorflow, modules_exist
label_desc: Use image node_id 4 for calling a global function with example usage: test_module_exists_for_tensorflow() without return types