randgen.h
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// See www.openfst.org for extensive documentation on this weighted
// finite-state transducer library.
#ifndef FST_SCRIPT_RANDGEN_H_
#define FST_SCRIPT_RANDGEN_H_
#include <ctime>
#include <tuple>
#include <fst/randgen.h>
#include <fst/script/fst-class.h>
#include <fst/script/script-impl.h>
namespace fst {
namespace script {
using RandGenArgs = std::tuple<const FstClass &, MutableFstClass *, time_t,
const RandGenOptions<RandArcSelection> &>;
template <class Arc>
void RandGen(RandGenArgs *args) {
const Fst<Arc> &ifst = *(std::get<0>(*args).GetFst<Arc>());
MutableFst<Arc> *ofst = std::get<1>(*args)->GetMutableFst<Arc>();
const time_t seed = std::get<2>(*args);
const auto &opts = std::get<3>(*args);
switch (opts.selector) {
case UNIFORM_ARC_SELECTOR: {
const UniformArcSelector<Arc> selector(seed);
const RandGenOptions<UniformArcSelector<Arc>> ropts(
selector, opts.max_length, opts.npath, opts.weighted,
opts.remove_total_weight);
RandGen(ifst, ofst, ropts);
return;
}
case FAST_LOG_PROB_ARC_SELECTOR: {
const FastLogProbArcSelector<Arc> selector(seed);
const RandGenOptions<FastLogProbArcSelector<Arc>> ropts(
selector, opts.max_length, opts.npath, opts.weighted,
opts.remove_total_weight);
RandGen(ifst, ofst, ropts);
return;
}
case LOG_PROB_ARC_SELECTOR: {
const LogProbArcSelector<Arc> selector(seed);
const RandGenOptions<LogProbArcSelector<Arc>> ropts(
selector, opts.max_length, opts.npath, opts.weighted,
opts.remove_total_weight);
RandGen(ifst, ofst, ropts);
return;
}
}
}
void RandGen(const FstClass &ifst, MutableFstClass *ofst,
time_t seed = time(nullptr),
const RandGenOptions<RandArcSelection> &opts =
RandGenOptions<RandArcSelection>(UNIFORM_ARC_SELECTOR));
} // namespace script
} // namespace fst
#endif // FST_SCRIPT_RANDGEN_H_