text: // ivector2bin/ivector-model-sum-accs.cc
  
  // Copyright 2013  Daniel Povey
  //           2016  Hang Su
  
  // See ../../COPYING for clarification regarding multiple authors
  //
  // Licensed under the Apache License, Version 2.0 (the "License");
  // you may not use this file except in compliance with the License.
  // You may obtain a copy of the License at
  //
  //  http://www.apache.org/licenses/LICENSE-2.0
  //
  // THIS CODE IS PROVIDED *AS IS* BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
  // KIND, EITHER EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION ANY IMPLIED
  // WARRANTIES OR CONDITIONS OF TITLE, FITNESS FOR A PARTICULAR PURPOSE,
  // MERCHANTABLITY OR NON-INFRINGEMENT.
  // See the Apache 2 License for the specific language governing permissions and
  // limitations under the License.
  
  #include "util/common-utils.h"
  #include "ivector3/ivector-extractor.h"
  
  
  int main(int argc, char *argv[]) {
    try {
      typedef kaldi::int32 int32;
      using namespace kaldi;
      using namespace kaldi::ivector3;
      
      const char *usage =
          "Sum accumulators for training of iVector extractor\n"
          "Usage: ivector-extractor-sum-accs [options] <stats-in1> "
          "<stats-in2> ... <stats-inN> <stats-out>\n";
  
      bool binary = true;
      bool parallel = false;
      kaldi::ParseOptions po(usage);
      po.Register("binary", &binary, "Write output in binary mode");
      po.Register("parallel", &parallel, "If true, the program makes sure to "
                  "open all filehandles before reading for any (useful when "
                  "summing accs from long processes)");
      
      po.Read(argc, argv);
  
      if (po.NumArgs() < 2) {
        po.PrintUsage();
        exit(1);
      }
  
      std::string stats_wxfilename = po.GetArg(po.NumArgs());
  
      IvectorExtractorStats stats;
  
      if (parallel) {
        std::vector<kaldi::Input*> inputs(po.NumArgs() - 1);
        for (int i = 1; i < po.NumArgs(); i++) {
          std::string stats_in_filename = po.GetArg(i);
          inputs[i-1] = new kaldi::Input(stats_in_filename); // Don't try
          // to work out binary status yet; this would cause us to wait
          // for the output of that process.  We delay it till later.
        }
        for (size_t i = 1; i < po.NumArgs(); i++) {
          bool b;
          kaldi::InitKaldiInputStream(inputs[i-1]->Stream(), &b);
          bool add = true;
          stats.Read(inputs[i-1]->Stream(), b, add);
          delete inputs[i-1];
        }
      } else {
        for (int32 i = 1; i < po.NumArgs(); i++) {
          std::string stats_rxfilename = po.GetArg(i);
          KALDI_LOG << "Reading stats from " << stats_rxfilename;
          bool binary_in;
          Input ki(stats_rxfilename, &binary_in);
          bool add = true;
          stats.Read(ki.Stream(), binary_in, add);
        }
      }    
      WriteKaldiObject(stats, stats_wxfilename, binary);
      
      KALDI_LOG << "Wrote summed stats to " << stats_wxfilename;
  
      return 0;
    } catch(const std::exception &e) {
      std::cerr << e.what() << '\n';
      return -1;
    }
  }
  
  
  