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
docstr: Given multiple match results, compose the final match results.
  The order of matches matters. Only the unmatched(-1s) in the current
  state will be substituted with the matching in the rest matches.
  
  Parameters
  ----------
  matches : list of NDArrays
      N match results, each is an output of a different Matcher
  
  Returns
  -------
   one match results as (B, N, M) NDArray
docstr_tok: ["Given","multiple","match","results",",","compose","the","final","match","results",".","The","order","of","matches","matters",".","Only","the","unmatched","(","-1s",")","in","the","current","state","will","be","substituted","with","the","matching","in","the","rest","matches",".","Parameters","--","--","--","--","--","matches",":","list","of","NDArrays","N","match","results",",","each","is","an","output","of","a","different","Matcher","Returns","--","--","--","-","one","match","results","as","(","B",",","N",",","M",")","NDArray"]
code: def _compose_matches(self, F, matches):
      """Given multiple match results, compose the final match results.
      The order of matches matters. Only the unmatched(-1s) in the current
      state will be substituted with the matching in the rest matches.
  
      Parameters
      ----------
      matches : list of NDArrays
          N match results, each is an output of a different Matcher
  
      Returns
      -------
       one match results as (B, N, M) NDArray
      """
      result = matches[0]
      for match in matches[1:]:
          result = F.where(result > -0.5, result, match)
      return result
  
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 3 for calling the CompositeMatcher obj's underlying member method code with example usage: obj._compose_matches(F, matches) and returns: result