1 files changed, 63 insertions, 0 deletions
diff --git a/src/bin/fstreweight.cc b/src/bin/fstreweight.cc
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+++ b/src/bin/fstreweight.cc
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+// fstreweight.cc
+
+// 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: allauzen@google.com (Cyril Allauzen)
+// Modified: jpr@google.com (Jake Ratkiewicz) to use FstClass
+//
+// \file
+// Reweights an FST.
+//
+
+#include <fst/script/reweight.h>
+#include <fst/script/text-io.h>
+
+DEFINE_bool(to_final, false, "Push/reweight to final (vs. to initial) states");
+
+int main(int argc, char **argv) {
+  namespace s = fst::script;
+  using fst::script::FstClass;
+  using fst::script::MutableFstClass;
+
+  string usage = "Reweights an FST.\n\n  Usage: ";
+  usage += argv[0];
+  usage += " in.fst potential.txt [out.fst]\n";
+
+  std::set_new_handler(FailedNewHandler);
+  SetFlags(usage.c_str(), &argc, &argv, true);
+  if (argc < 3 || argc > 4) {
+    ShowUsage();
+    return 1;
+  }
+
+  string in_fname = argv[1];
+  string potentials_fname = argv[2];
+  string out_fname = argc > 3 ? argv[3] : "";
+
+  MutableFstClass *fst = MutableFstClass::Read(in_fname, true);
+  if (!fst) return 1;
+
+  vector<s::WeightClass> potential;
+  if (!s::ReadPotentials(fst->WeightType(), potentials_fname, &potential))
+    return 1;
+
+  fst::ReweightType reweight_type = FLAGS_to_final ?
+      fst::REWEIGHT_TO_FINAL :
+      fst::REWEIGHT_TO_INITIAL;
+
+  s::Reweight(fst, potential, reweight_type);
+  fst->Write(out_fname);
+
+  return 0;
+}