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diff --git a/kaldi_io/src/kaldi/itf/optimizable-itf.h b/kaldi_io/src/kaldi/itf/optimizable-itf.h
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--- a/kaldi_io/src/kaldi/itf/optimizable-itf.h
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@@ -1,51 +0,0 @@
-// itf/optimizable-itf.h
-
-// Copyright 2009-2011  Go Vivace Inc.;  Microsoft Corporation;  Georg Stemmer
-
-// 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_OPTIMIZABLE_ITF_H_
-#define KALDI_ITF_OPTIMIZABLE_ITF_H_
-
-#include "base/kaldi-common.h"
-#include "matrix/matrix-lib.h"
-
-namespace kaldi {
-/// @ingroup Interfaces
-/// @{
-
-/// OptimizableInterface provides
-/// a virtual class for optimizable objects.
-/// E.g. a class that computed a likelihood function and
-/// its gradient using some parameter
-/// that has to be optimized on data
-/// could inherit from it.
-template<class Real>
-class OptimizableInterface {
- public:
-  /// computes gradient for a parameter params and returns it
-  /// in gradient_out
-  virtual void ComputeGradient(const Vector<Real> &params,
-                               Vector<Real> *gradient_out) = 0;
-  /// computes the function value for a parameter params
-  /// and returns it
-  virtual Real ComputeValue(const Vector<Real> &params) = 0;
-
-  virtual ~OptimizableInterface() {}
-};
-/// @} end of "Interfaces"
-} // end namespace kaldi
-
-#endif