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 __init__(self, matchers):
      super(CompositeMatcher, self).__init__()
      assert len(matchers) > 0, "At least one matcher required."
      for matcher in matchers:
          assert isinstance(matcher, (gluon.Block, gluon.HybridBlock))
      self._matchers = nn.HybridSequential()
      for m in matchers:
          self._matchers.add(m)
  
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 1 to create a new CompositeMatcher object from inherited base classes: gluon with example: obj = CompositeMatcher(matchers)