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+// hmm/tree-accu.h
+
+// Copyright 2009-2011 Microsoft Corporation
+//                2013 Johns Hopkins University (author: Daniel Povey)
+
+// See ../../COPYING for clarification regarding multiple authors
+//
+// 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
+
+// THIS CODE IS PROVIDED *AS IS* BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+// KIND, EITHER EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION ANY IMPLIED
+// WARRANTIES OR CONDITIONS OF TITLE, FITNESS FOR A PARTICULAR PURPOSE,
+// MERCHANTABLITY OR NON-INFRINGEMENT.
+// See the Apache 2 License for the specific language governing permissions and
+// limitations under the License.
+#ifndef KALDI_HMM_TREE_ACCU_H_
+#define KALDI_HMM_TREE_ACCU_H_
+
+#include <cctype>  // For isspace.
+#include <limits>
+#include "base/kaldi-common.h"
+#include "hmm/transition-model.h"
+#include "tree/clusterable-classes.h"
+#include "tree/build-tree-questions.h" // needed for this typedef:
+// typedef std::vector<std::pair<EventVector, Clusterable*> > BuildTreeStatsType;
+
+namespace kaldi {
+
+/// \ingroup tree_group_top
+/// @{
+
+
+/// Accumulates the stats needed for training context-dependency trees (in the
+/// "normal" way).  It adds to 'stats' the stats obtained from this file.  Any
+/// new GaussClusterable* pointers in "stats" will be allocated with "new".
+
+void AccumulateTreeStats(const TransitionModel &trans_model,
+                         BaseFloat var_floor,
+                         int N,  // context window size.
+                         int P,  // central position.
+                         const std::vector<int32> &ci_phones,  // sorted
+                         const std::vector<int32> &alignment,
+                         const Matrix<BaseFloat> &features,
+                         const std::vector<int32> *phone_map, // or NULL
+                         std::map<EventType, GaussClusterable*> *stats);
+
+
+
+/*** Read a mapping from one phone set to another.  The phone map file has lines
+ of the form <old-phone> <new-phone>, where both entries are integers, usually
+ nonzero (but this is not enforced).  This program will crash if the input is
+ invalid, e.g. there are multiple inconsistent entries for the same old phone.
+ The output vector "phone_map" will be indexed by old-phone and will contain
+ the corresponding new-phone, or -1 for any entry that was not defined. */
+ 
+void ReadPhoneMap(std::string phone_map_rxfilename,
+                  std::vector<int32> *phone_map);
+
+
+
+/// @}
+
+}  // end namespace kaldi.
+
+#endif