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// 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
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
// Copyright 2005-2010 Google, Inc.
// Author: jpr@google.com (Jake Ratkiewicz)
#ifndef FST_SCRIPT_RANDGEN_H_
#define FST_SCRIPT_RANDGEN_H_
#include <fst/script/arg-packs.h>
#include <fst/script/fst-class.h>
#include <fst/randgen.h>
namespace fst {
namespace script {
enum RandArcSelection {
UNIFORM_ARC_SELECTOR,
LOG_PROB_ARC_SELECTOR,
FAST_LOG_PROB_ARC_SELECTOR
};
typedef args::Package<const FstClass &, MutableFstClass*, int32,
const RandGenOptions<RandArcSelection> &> RandGenArgs;
template<class Arc>
void RandGen(RandGenArgs *args) {
const Fst<Arc> &ifst = *(args->arg1.GetFst<Arc>());
MutableFst<Arc> *ofst = args->arg2->GetMutableFst<Arc>();
int32 seed = args->arg3;
const RandGenOptions<RandArcSelection> &opts = args->arg4;
if (opts.arc_selector == UNIFORM_ARC_SELECTOR) {
UniformArcSelector<Arc> arc_selector(seed);
RandGenOptions< UniformArcSelector<Arc> >
ropts(arc_selector, opts.max_length,
opts.npath, opts.weighted);
RandGen(ifst, ofst, ropts);
} else if (opts.arc_selector == FAST_LOG_PROB_ARC_SELECTOR) {
FastLogProbArcSelector<Arc> arc_selector(seed);
RandGenOptions< FastLogProbArcSelector<Arc> >
ropts(arc_selector, opts.max_length,
opts.npath, opts.weighted);
RandGen(ifst, ofst, ropts);
} else {
LogProbArcSelector<Arc> arc_selector(seed);
RandGenOptions< LogProbArcSelector<Arc> >
ropts(arc_selector, opts.max_length,
opts.npath, opts.weighted);
RandGen(ifst, ofst, ropts);
}
}
// Client-facing prototype
void RandGen(const FstClass &ifst, MutableFstClass *ofst, int32 seed = time(0),
const RandGenOptions<RandArcSelection> &opts =
fst::RandGenOptions<fst::script::RandArcSelection>(
fst::script::UNIFORM_ARC_SELECTOR));
} // namespace script
} // namespace fst
#endif // FST_SCRIPT_RANDGEN_H_
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