// nnetbin/nnet-kl-gmm-sum-accs.cc

// Copyright 2013  Idiap Research Institute (Author: David Imseng)
//                 Karlsruhe Institute of Technology (Author: Ngoc Thang Vu)
//                 Brno University of Technology (Author: Karel Vesely)

// 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 "nnet/nnet-nnet.h"
#include "nnet/nnet-kl-hmm.h"
#include "base/kaldi-common.h"
#include "util/common-utils.h"


int main(int argc, char *argv[]) {
  using namespace kaldi;
  using namespace kaldi::nnet1;

  try {
    typedef int32 int32;
    const char *usage =
        "Convert matrix of KL-HMM training to nnet component.\n"
        "Usage: nnet-kl-hmm-mat-to-component [options] nnet-component matrix\n";

    bool binary = true;
    int32 n_kl_states = 0;
    int32 n_posterior_dim = 0;
    ParseOptions po(usage);
    po.Register("binary", &binary, "Write output in binary mode");
    po.Register("nkl-states", &n_kl_states, "Number of states in Kl-HMM");
    po.Register("posterior-dim", &n_posterior_dim, "Dimensionality of posterior features");
    po.Read(argc, argv);

    if (po.NumArgs() < 2) {
      po.PrintUsage();
      exit(1);
    }

    std::string nnet_component_filename = po.GetArg(1);
    std::string mat_filename = po.GetArg(2);
    
    Matrix<BaseFloat> kl_stats;
    {
      bool binary_read;
      Input ki(mat_filename, &binary_read);
      kl_stats.Read(ki.Stream(), binary_read);
    }
    
    KlHmm kl_hmm(kl_stats.NumCols(), kl_stats.NumRows());
    kl_hmm.SetStats(kl_stats);
    

    // Write out the accs
    {
      Output ko(nnet_component_filename, binary);
      kl_hmm.Write(ko.Stream(), binary);
    }

    KALDI_LOG << "Written nnet component to " << nnet_component_filename;
  } catch(const std::exception &e) {
    std::cerr << e.what() << '\n';
    return -1;
  }
}