class_docstr: A Matcher that combines multiple strategies.
  
  Parameters
  ----------
  matchers : list of Matcher
      Matcher is a Block/HybridBlock used to match two groups of boxes
code: def hybrid_forward(self, F, x):
      matches = [matcher(x) for matcher in self._matchers]
      return self._compose_matches(F, matches)
  
file_path: gluon-cv/gluoncv/nn/matcher.py
imports: from __future__ import absolute_import
  from mxnet import gluon
  from mxnet.gluon import nn
label_desc: Use image node_id 2 for calling the CompositeMatcher obj's underlying member method code with example usage: obj.hybrid_forward(F, x) and returns: self