code: def stack(self, preds, labels):
      pass
  
file_path: BigDL/python/nano/src/bigdl/nano/deps/neural_compressor/core/base_metric.py
imports: from abc import ABC, abstractmethod
  from bigdl.nano.utils.common import invalidInputError
label_desc: Use image node_id 7 for calling the BaseINCMetric obj's underlying member method code with example usage: obj.stack(preds, labels) without return types