code: def aggregation(self):
      return {"acc": mean}
  
file_path: lm-evaluation-harness/lm_eval/tasks/pubmedqa.py
imports: import numpy
  from lm_eval.base import rf, Task
  from lm_eval.metrics import mean
label_desc: Use image node_id 11 for calling the Pubmed_QA obj's underlying member method code with example usage: obj.aggregation() and returns: dict