nnet-shuffle-egs.cc File Reference

#include "base/kaldi-common.h"
#include "util/common-utils.h"
#include "hmm/transition-model.h"
#include "nnet2/nnet-example-functions.h"

Include dependency graph for nnet-shuffle-egs.cc:

Go to the source code of this file.

Functions
int	main (int argc, char *argv[])

Function Documentation

main()

int main	(	int	argc,
		char *	argv[]
	)

Definition at line 26 of file nnet-shuffle-egs.cc.

References SequentialTableReader< Holder >::Done(), ParseOptions::GetArg(), rnnlm::i, KALDI_ASSERT, KALDI_LOG, SequentialTableReader< Holder >::Key(), SequentialTableReader< Holder >::Next(), ParseOptions::NumArgs(), ParseOptions::PrintUsage(), kaldi::RandInt(), ParseOptions::Read(), ParseOptions::Register(), SequentialTableReader< Holder >::Value(), and TableWriter< Holder >::Write().

                                 {
  try {
    using namespace kaldi;
    using namespace kaldi::nnet2;
    typedef kaldi::int32 int32;
    typedef kaldi::int64 int64;

    const char *usage =
        "Copy examples (typically single frames) for neural network training,\n"
        "from the input to output, but randomly shuffle the order.  This program will keep\n"
        "all of the examples in memory at once, unless you use the --buffer-size option\n"
        "\n"
        "Usage:  nnet-shuffle-egs [options] <egs-rspecifier> <egs-wspecifier>\n"
        "\n"
        "nnet-shuffle-egs --srand=1 ark:train.egs ark:shuffled.egs\n";

    int32 srand_seed = 0;
    int32 buffer_size = 0;
    ParseOptions po(usage);
    po.Register("srand", &srand_seed, "Seed for random number generator ");
    po.Register("buffer-size", &buffer_size, "If >0, size of a buffer we use "
                "to do limited-memory partial randomization.  Otherwise, do "
                "full randomization.");

    po.Read(argc, argv);

    srand(srand_seed);

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

    std::string examples_rspecifier = po.GetArg(1),
        examples_wspecifier = po.GetArg(2);

    int64 num_done = 0;

    std::vector<std::pair<std::string, NnetExample*> > egs;

    SequentialNnetExampleReader example_reader(examples_rspecifier);
    NnetExampleWriter example_writer(examples_wspecifier);
    if (buffer_size == 0) {  // Do full randomization
      // Putting in an extra level of indirection here to avoid excessive
      // computation and memory demands when we have to resize the vector.

      for (; !example_reader.Done(); example_reader.Next())
        egs.push_back(std::make_pair(example_reader.Key(),
                                     new NnetExample(example_reader.Value())));

      std::random_shuffle(egs.begin(), egs.end());
    } else {
      KALDI_ASSERT(buffer_size > 0);
      egs.resize(buffer_size,
          std::pair<std::string, NnetExample*>("", static_cast<NnetExample *>(NULL)));
      for (; !example_reader.Done(); example_reader.Next()) {
        int32 index = RandInt(0, buffer_size - 1);
        if (egs[index].second == NULL) {
          egs[index] = std::make_pair(example_reader.Key(),
                                    new NnetExample(example_reader.Value()));
        } else {
          example_writer.Write(egs[index].first, *(egs[index].second));
          egs[index].first = example_reader.Key();
          *(egs[index].second) = example_reader.Value();
          num_done++;
        }
      }
    }
    for (size_t i = 0; i < egs.size(); i++) {
      if (egs[i].second != NULL) {
        example_writer.Write(egs[i].first, *(egs[i].second));
        delete egs[i].second;
        num_done++;
      }
    }

    KALDI_LOG << "Shuffled order of " << num_done
              << " neural-network training examples "
              << (buffer_size ? "using a buffer (partial randomization)" : "");

    return (num_done == 0 ? 1 : 0);
  } catch(const std::exception &e) {
    std::cerr << e.what() << '\n';
    return -1;
  }
}