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diff --git a/kaldi_io/src/kaldi/itf/context-dep-itf.h b/kaldi_io/src/kaldi/itf/context-dep-itf.h
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--- a/kaldi_io/src/kaldi/itf/context-dep-itf.h
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-// itf/context-dep-itf.h
-
-// Copyright 2009-2011     Microsoft Corporation;  Go Vivace Inc.
-
-// 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_ITF_CONTEXT_DEP_ITF_H_
-#define KALDI_ITF_CONTEXT_DEP_ITF_H_
-#include "base/kaldi-common.h"
-
-namespace kaldi {
-/// @ingroup tree_group
-/// @{
-
-/// context-dep-itf.h provides a link between
-/// the tree-building code in ../tree/, and the FST code in ../fstext/
-/// (particularly, ../fstext/context-dep.h).  It is an abstract
-/// interface that describes an object that can map from a
-/// phone-in-context to a sequence of integer leaf-ids.
-class ContextDependencyInterface {
- public:
-  /// ContextWidth() returns the value N (e.g. 3 for triphone models) that says how many phones
-  ///   are considered for computing context.
-  virtual int ContextWidth() const = 0;
-
-  /// Central position P of the phone context, in 0-based numbering, e.g. P = 1 for typical
-  /// triphone system.  We have to see if we can do without this function.
-  virtual int CentralPosition() const = 0;
-
-  /// The "new" Compute interface.  For typical topologies,
-  /// pdf_class would be 0, 1, 2.
-  /// Returns success or failure; outputs the pdf-id.
-  ///
-  /// "Compute" is the main function of this interface, that takes a
-  /// sequence of N phones (and it must be N phones), possibly
-  /// including epsilons (symbol id zero) but only at positions other
-  /// than P [these represent unknown phone context due to end or
-  /// begin of sequence].  We do not insist that Compute must always
-  /// output (into stateseq) a nonempty sequence of states, but we
-  /// anticipate that stateseq will alyway be nonempty at output in
-  /// typical use cases.  "Compute" returns false if expansion somehow
-  /// failed.  Normally the calling code should raise an exception if
-  /// this happens.  We can define a different interface later in
-  /// order to handle other kinds of information-- the underlying
-  /// data-structures from event-map.h are very flexible.
-  virtual bool Compute(const std::vector<int32> &phoneseq, int32 pdf_class,
-                       int32 *pdf_id) const = 0;
-
-
-
-  /// NumPdfs() returns the number of acoustic pdfs (they are numbered 0.. NumPdfs()-1).
-  virtual int32 NumPdfs() const = 0;
-
-  virtual ~ContextDependencyInterface() {};
-  ContextDependencyInterface() {}
-
-  /// Returns pointer to new object which is copy of current one.
-  virtual ContextDependencyInterface *Copy() const = 0;
- private:
-  KALDI_DISALLOW_COPY_AND_ASSIGN(ContextDependencyInterface);
-};
-/// @}
-}  // namespace Kaldi
-
-
-#endif