code: def stack(self, output):
      return np.stack(output)
  
file_path: BigDL/python/nano/src/bigdl/nano/deps/openvino/core/metric.py
imports: from openvino.tools.pot import Metric
  import numpy
label_desc: Use image node_id 4 for calling the BaseOpenVINOMetric obj's underlying member method code with example usage: obj.stack(output) and returns: np