class_docstr: Metric base class.
docstr: :return: Hashing value using the metric as `str`.
code: def __hash__(self):
      """:return: Hashing value using the metric as `str`."""
      return str(self).__hash__()
  
file_path: MatchZoo/matchzoo/engine/base_metric.py
imports: import abc
  import numpy
label_desc: Use image node_id 4 for calling the BaseMetric obj's underlying member method code with example usage: obj.__hash__() and returns: str