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diff --git a/kaldi_io/src/tools/openfst/include/fst/signed-log-weight.h b/kaldi_io/src/tools/openfst/include/fst/signed-log-weight.h
deleted file mode 100644
index 61adefb..0000000
--- a/kaldi_io/src/tools/openfst/include/fst/signed-log-weight.h
+++ /dev/null
@@ -1,367 +0,0 @@
-
-// 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: [email protected] (Kasturi Rangan Raghavan)
-// \file
-// LogWeight along with sign information that represents the value X in the
-// linear domain as <sign(X), -ln(|X|)>
-// The sign is a TropicalWeight:
-//  positive, TropicalWeight.Value() > 0.0, recommended value 1.0
-//  negative, TropicalWeight.Value() <= 0.0, recommended value -1.0
-
-#ifndef FST_LIB_SIGNED_LOG_WEIGHT_H_
-#define FST_LIB_SIGNED_LOG_WEIGHT_H_
-
-#include <fst/float-weight.h>
-#include <fst/pair-weight.h>
-
-
-namespace fst {
-template <class T>
-class SignedLogWeightTpl
-    : public PairWeight<TropicalWeight, LogWeightTpl<T> > {
- public:
-  typedef TropicalWeight X1;
-  typedef LogWeightTpl<T> X2;
-  using PairWeight<X1, X2>::Value1;
-  using PairWeight<X1, X2>::Value2;
-
-  using PairWeight<X1, X2>::Reverse;
-  using PairWeight<X1, X2>::Quantize;
-  using PairWeight<X1, X2>::Member;
-
-  typedef SignedLogWeightTpl<T> ReverseWeight;
-
-  SignedLogWeightTpl() : PairWeight<X1, X2>() {}
-
-  SignedLogWeightTpl(const SignedLogWeightTpl<T>& w)
-      : PairWeight<X1, X2> (w) { }
-
-  SignedLogWeightTpl(const PairWeight<X1, X2>& w)
-      : PairWeight<X1, X2> (w) { }
-
-  SignedLogWeightTpl(const X1& x1, const X2& x2)
-      : PairWeight<X1, X2>(x1, x2) { }
-
-  static const SignedLogWeightTpl<T> &Zero() {
-    static const SignedLogWeightTpl<T> zero(X1(1.0), X2::Zero());
-    return zero;
-  }
-
-  static const SignedLogWeightTpl<T> &One() {
-    static const SignedLogWeightTpl<T> one(X1(1.0), X2::One());
-    return one;
-  }
-
-  static const SignedLogWeightTpl<T> &NoWeight() {
-    static const SignedLogWeightTpl<T> no_weight(X1(1.0), X2::NoWeight());
-    return no_weight;
-  }
-
-  static const string &Type() {
-    static const string type = "signed_log_" + X1::Type() + "_" + X2::Type();
-    return type;
-  }
-
-  ProductWeight<X1, X2> Quantize(float delta = kDelta) const {
-    return PairWeight<X1, X2>::Quantize();
-  }
-
-  ReverseWeight Reverse() const {
-    return PairWeight<X1, X2>::Reverse();
-  }
-
-  bool Member() const {
-    return PairWeight<X1, X2>::Member();
-  }
-
-  static uint64 Properties() {
-    // not idempotent nor path
-    return kLeftSemiring | kRightSemiring | kCommutative;
-  }
-
-  size_t Hash() const {
-    size_t h1;
-    if (Value2() == X2::Zero() || Value1().Value() > 0.0)
-      h1 = TropicalWeight(1.0).Hash();
-    else
-      h1 = TropicalWeight(-1.0).Hash();
-    size_t h2 = Value2().Hash();
-    const int lshift = 5;
-    const int rshift = CHAR_BIT * sizeof(size_t) - 5;
-    return h1 << lshift ^ h1 >> rshift ^ h2;
-  }
-};
-
-template <class T>
-inline SignedLogWeightTpl<T> Plus(const SignedLogWeightTpl<T> &w1,
-                                  const SignedLogWeightTpl<T> &w2) {
-  if (!w1.Member() || !w2.Member())
-    return SignedLogWeightTpl<T>::NoWeight();
-  bool s1 = w1.Value1().Value() > 0.0;
-  bool s2 = w2.Value1().Value() > 0.0;
-  T f1 = w1.Value2().Value();
-  T f2 = w2.Value2().Value();
-  if (f1 == FloatLimits<T>::PosInfinity())
-    return w2;
-  else if (f2 == FloatLimits<T>::PosInfinity())
-    return w1;
-  else if (f1 == f2) {
-    if (s1 == s2)
-      return SignedLogWeightTpl<T>(w1.Value1(), (f2 - log(2.0F)));
-    else
-      return SignedLogWeightTpl<T>::Zero();
-  } else if (f1 > f2) {
-    if (s1 == s2) {
-      return SignedLogWeightTpl<T>(
-        w1.Value1(), (f2 - log(1.0F + exp(f2 - f1))));
-    } else {
-      return SignedLogWeightTpl<T>(
-        w2.Value1(), (f2 - log(1.0F - exp(f2 - f1))));
-    }
-  } else {
-    if (s2 == s1) {
-      return SignedLogWeightTpl<T>(
-        w2.Value1(), (f1 - log(1.0F + exp(f1 - f2))));
-    } else {
-      return SignedLogWeightTpl<T>(
-        w1.Value1(), (f1 - log(1.0F - exp(f1 - f2))));
-    }
-  }
-}
-
-template <class T>
-inline SignedLogWeightTpl<T> Minus(const SignedLogWeightTpl<T> &w1,
-                                   const SignedLogWeightTpl<T> &w2) {
-  SignedLogWeightTpl<T> minus_w2(-w2.Value1().Value(), w2.Value2());
-  return Plus(w1, minus_w2);
-}
-
-template <class T>
-inline SignedLogWeightTpl<T> Times(const SignedLogWeightTpl<T> &w1,
-                                   const SignedLogWeightTpl<T> &w2) {
-  if (!w1.Member() || !w2.Member())
-    return SignedLogWeightTpl<T>::NoWeight();
-  bool s1 = w1.Value1().Value() > 0.0;
-  bool s2 = w2.Value1().Value() > 0.0;
-  T f1 = w1.Value2().Value();
-  T f2 = w2.Value2().Value();
-  if (s1 == s2)
-    return SignedLogWeightTpl<T>(TropicalWeight(1.0), (f1 + f2));
-  else
-    return SignedLogWeightTpl<T>(TropicalWeight(-1.0), (f1 + f2));
-}
-
-template <class T>
-inline SignedLogWeightTpl<T> Divide(const SignedLogWeightTpl<T> &w1,
-                                    const SignedLogWeightTpl<T> &w2,
-                                    DivideType typ = DIVIDE_ANY) {
-  if (!w1.Member() || !w2.Member())
-    return SignedLogWeightTpl<T>::NoWeight();
-  bool s1 = w1.Value1().Value() > 0.0;
-  bool s2 = w2.Value1().Value() > 0.0;
-  T f1 = w1.Value2().Value();
-  T f2 = w2.Value2().Value();
-  if (f2 == FloatLimits<T>::PosInfinity())
-    return SignedLogWeightTpl<T>(TropicalWeight(1.0),
-      FloatLimits<T>::NumberBad());
-  else if (f1 == FloatLimits<T>::PosInfinity())
-    return SignedLogWeightTpl<T>(TropicalWeight(1.0),
-      FloatLimits<T>::PosInfinity());
-  else if (s1 == s2)
-    return SignedLogWeightTpl<T>(TropicalWeight(1.0), (f1 - f2));
-  else
-    return SignedLogWeightTpl<T>(TropicalWeight(-1.0), (f1 - f2));
-}
-
-template <class T>
-inline bool ApproxEqual(const SignedLogWeightTpl<T> &w1,
-                        const SignedLogWeightTpl<T> &w2,
-                        float delta = kDelta) {
-  bool s1 = w1.Value1().Value() > 0.0;
-  bool s2 = w2.Value1().Value() > 0.0;
-  if (s1 == s2) {
-    return ApproxEqual(w1.Value2(), w2.Value2(), delta);
-  } else {
-    return w1.Value2() == LogWeightTpl<T>::Zero()
-        && w2.Value2() == LogWeightTpl<T>::Zero();
-  }
-}
-
-template <class T>
-inline bool operator==(const SignedLogWeightTpl<T> &w1,
-                       const SignedLogWeightTpl<T> &w2) {
-  bool s1 = w1.Value1().Value() > 0.0;
-  bool s2 = w2.Value1().Value() > 0.0;
-  if (s1 == s2)
-    return w1.Value2() == w2.Value2();
-  else
-    return (w1.Value2() == LogWeightTpl<T>::Zero()) &&
-           (w2.Value2() == LogWeightTpl<T>::Zero());
-}
-
-
-// Single-precision signed-log weight
-typedef SignedLogWeightTpl<float> SignedLogWeight;
-// Double-precision signed-log weight
-typedef SignedLogWeightTpl<double> SignedLog64Weight;
-
-//
-// WEIGHT CONVERTER SPECIALIZATIONS.
-//
-
-template <class W1, class W2>
-bool SignedLogConvertCheck(W1 w) {
-  if (w.Value1().Value() < 0.0) {
-    FSTERROR() << "WeightConvert: can't convert weight from \""
-               << W1::Type() << "\" to \"" << W2::Type();
-    return false;
-  }
-  return true;
-}
-
-// Convert to tropical
-template <>
-struct WeightConvert<SignedLogWeight, TropicalWeight> {
-  TropicalWeight operator()(SignedLogWeight w) const {
-    if (!SignedLogConvertCheck<SignedLogWeight, TropicalWeight>(w))
-      return TropicalWeight::NoWeight();
-    return w.Value2().Value();
-  }
-};
-
-template <>
-struct WeightConvert<SignedLog64Weight, TropicalWeight> {
-  TropicalWeight operator()(SignedLog64Weight w) const {
-    if (!SignedLogConvertCheck<SignedLog64Weight, TropicalWeight>(w))
-      return TropicalWeight::NoWeight();
-    return w.Value2().Value();
-  }
-};
-
-// Convert to log
-template <>
-struct WeightConvert<SignedLogWeight, LogWeight> {
-  LogWeight operator()(SignedLogWeight w) const {
-    if (!SignedLogConvertCheck<SignedLogWeight, LogWeight>(w))
-      return LogWeight::NoWeight();
-    return w.Value2().Value();
-  }
-};
-
-template <>
-struct WeightConvert<SignedLog64Weight, LogWeight> {
-  LogWeight operator()(SignedLog64Weight w) const {
-    if (!SignedLogConvertCheck<SignedLog64Weight, LogWeight>(w))
-      return LogWeight::NoWeight();
-    return w.Value2().Value();
-  }
-};
-
-// Convert to log64
-template <>
-struct WeightConvert<SignedLogWeight, Log64Weight> {
-  Log64Weight operator()(SignedLogWeight w) const {
-    if (!SignedLogConvertCheck<SignedLogWeight, Log64Weight>(w))
-      return Log64Weight::NoWeight();
-    return w.Value2().Value();
-  }
-};
-
-template <>
-struct WeightConvert<SignedLog64Weight, Log64Weight> {
-  Log64Weight operator()(SignedLog64Weight w) const {
-    if (!SignedLogConvertCheck<SignedLog64Weight, Log64Weight>(w))
-      return Log64Weight::NoWeight();
-    return w.Value2().Value();
-  }
-};
-
-// Convert to signed log
-template <>
-struct WeightConvert<TropicalWeight, SignedLogWeight> {
-  SignedLogWeight operator()(TropicalWeight w) const {
-    TropicalWeight x1 = 1.0;
-    LogWeight x2 = w.Value();
-    return SignedLogWeight(x1, x2);
-  }
-};
-
-template <>
-struct WeightConvert<LogWeight, SignedLogWeight> {
-  SignedLogWeight operator()(LogWeight w) const {
-    TropicalWeight x1 = 1.0;
-    LogWeight x2 = w.Value();
-    return SignedLogWeight(x1, x2);
-  }
-};
-
-template <>
-struct WeightConvert<Log64Weight, SignedLogWeight> {
-  SignedLogWeight operator()(Log64Weight w) const {
-    TropicalWeight x1 = 1.0;
-    LogWeight x2 = w.Value();
-    return SignedLogWeight(x1, x2);
-  }
-};
-
-template <>
-struct WeightConvert<SignedLog64Weight, SignedLogWeight> {
-  SignedLogWeight operator()(SignedLog64Weight w) const {
-    TropicalWeight x1 = w.Value1();
-    LogWeight x2 = w.Value2().Value();
-    return SignedLogWeight(x1, x2);
-  }
-};
-
-// Convert to signed log64
-template <>
-struct WeightConvert<TropicalWeight, SignedLog64Weight> {
-  SignedLog64Weight operator()(TropicalWeight w) const {
-    TropicalWeight x1 = 1.0;
-    Log64Weight x2 = w.Value();
-    return SignedLog64Weight(x1, x2);
-  }
-};
-
-template <>
-struct WeightConvert<LogWeight, SignedLog64Weight> {
-  SignedLog64Weight operator()(LogWeight w) const {
-    TropicalWeight x1 = 1.0;
-    Log64Weight x2 = w.Value();
-    return SignedLog64Weight(x1, x2);
-  }
-};
-
-template <>
-struct WeightConvert<Log64Weight, SignedLog64Weight> {
-  SignedLog64Weight operator()(Log64Weight w) const {
-    TropicalWeight x1 = 1.0;
-    Log64Weight x2 = w.Value();
-    return SignedLog64Weight(x1, x2);
-  }
-};
-
-template <>
-struct WeightConvert<SignedLogWeight, SignedLog64Weight> {
-  SignedLog64Weight operator()(SignedLogWeight w) const {
-    TropicalWeight x1 = w.Value1();
-    Log64Weight x2 = w.Value2().Value();
-    return SignedLog64Weight(x1, x2);
-  }
-};
-
-}  // namespace fst
-
-#endif  // FST_LIB_SIGNED_LOG_WEIGHT_H_