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diff --git a/kaldi_io/src/tools/openfst/include/fst/verify.h b/kaldi_io/src/tools/openfst/include/fst/verify.h
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+++ b/kaldi_io/src/tools/openfst/include/fst/verify.h
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+// verify.h
+
+// 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] (Michael Riley)
+//
+// \file
+// Function to verify an Fst's contents
+
+#ifndef FST_LIB_VERIFY_H__
+#define FST_LIB_VERIFY_H__
+
+#include <fst/fst.h>
+#include <fst/test-properties.h>
+
+
+namespace fst {
+
+// Verifies that an Fst's contents are sane.
+template<class Arc>
+bool Verify(const Fst<Arc> &fst, bool allow_negative_labels = false) {
+  typedef typename Arc::Label Label;
+  typedef typename Arc::Weight Weight;
+  typedef typename Arc::StateId StateId;
+
+  StateId start = fst.Start();
+  const SymbolTable *isyms = fst.InputSymbols();
+  const SymbolTable *osyms = fst.OutputSymbols();
+
+  // Count states
+  StateId ns = 0;
+  for (StateIterator< Fst<Arc> > siter(fst);
+       !siter.Done();
+       siter.Next())
+    ++ns;
+
+  if (start == kNoStateId && ns > 0) {
+    LOG(ERROR) << "Verify: Fst start state ID unset";
+    return false;
+  } else if (start >= ns) {
+    LOG(ERROR) << "Verify: Fst start state ID exceeds number of states";
+    return false;
+  }
+
+  for (StateIterator< Fst<Arc> > siter(fst);
+       !siter.Done();
+       siter.Next()) {
+    StateId s = siter.Value();
+    size_t na = 0;
+    for (ArcIterator< Fst<Arc> > aiter(fst, s);
+         !aiter.Done();
+         aiter.Next()) {
+      const Arc &arc =aiter.Value();
+      if (!allow_negative_labels && arc.ilabel < 0) {
+        LOG(ERROR) << "Verify: Fst input label ID of arc at position "
+                   << na << " of state " << s << " is negative";
+        return false;
+      } else if (isyms && isyms->Find(arc.ilabel) == "") {
+        LOG(ERROR) << "Verify: Fst input label ID " << arc.ilabel
+                   << " of arc at position " << na << " of state " <<  s
+                   << " is missing from input symbol table \""
+                   << isyms->Name() << "\"";
+        return false;
+      } else if (!allow_negative_labels && arc.olabel < 0) {
+        LOG(ERROR) << "Verify: Fst output label ID of arc at position "
+                   << na << " of state " << s << " is negative";
+        return false;
+      } else if (osyms && osyms->Find(arc.olabel) == "") {
+        LOG(ERROR) << "Verify: Fst output label ID " << arc.olabel
+                   << " of arc at position " << na << " of state " <<  s
+                   << " is missing from output symbol table \""
+                   << osyms->Name() << "\"";
+        return false;
+      } else if (!arc.weight.Member() || arc.weight == Weight::Zero()) {
+        LOG(ERROR) << "Verify: Fst weight of arc at position "
+                   << na << " of state " << s << " is invalid";
+        return false;
+      } else if (arc.nextstate < 0) {
+        LOG(ERROR) << "Verify: Fst destination state ID of arc at position "
+                   << na << " of state " << s << " is negative";
+        return false;
+      } else if (arc.nextstate >= ns) {
+        LOG(ERROR) << "Verify: Fst destination state ID of arc at position "
+                   << na << " of state " << s
+                   << " exceeds number of states";
+        return false;
+      }
+      ++na;
+    }
+    if (!fst.Final(s).Member()) {
+      LOG(ERROR) << "Verify: Fst final weight of state " << s << " is invalid";
+      return false;
+    }
+  }
+  uint64 fst_props = fst.Properties(kFstProperties, false);
+  if (fst_props & kError) {
+    LOG(ERROR) << "Verify: Fst error property is set";
+    return false;
+  }
+
+  uint64 known_props;
+  uint64 test_props = ComputeProperties(fst, kFstProperties, &known_props,
+                                        false);
+  if (!CompatProperties(fst_props, test_props)) {
+    LOG(ERROR) << "Verify: stored Fst properties incorrect "
+               << "(props1 = stored props, props2 = tested)";
+    return false;
+  } else {
+    return true;
+  }
+}
+
+}  // namespace fst
+
+#endif  // FST_LIB_VERIFY_H__