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+// 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