code: def _is_valid_greybox_explainer(proposed_explainer):
      return _is_valid_explainer(proposed_explainer, "specific")
  
file_path: interpret/python/interpret-core/interpret/ext/extension.py
imports: import logging
label_desc: Use image node_id 4 for calling a global function with example usage: _is_valid_greybox_explainer(proposed_explainer) and returns: _is_valid_explainer