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// itf/clusterable-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_CLUSTERABLE_ITF_H_
#define KALDI_ITF_CLUSTERABLE_ITF_H_ 1
#include <string>
#include "base/kaldi-common.h"
namespace kaldi {
/** \addtogroup clustering_group
@{
A virtual class for clusterable objects; see \ref clustering for an
explanation if its function.
*/
class Clusterable {
public:
/// \name Functions that must be overridden
/// @{
/// Return a copy of this object.
virtual Clusterable *Copy() const = 0;
/// Return the objective function associated with the stats
/// [assuming ML estimation]
virtual BaseFloat Objf() const = 0;
/// Return the normalizer (typically, count) associated with the stats
virtual BaseFloat Normalizer() const = 0;
/// Set stats to empty.
virtual void SetZero() = 0;
/// Add other stats.
virtual void Add(const Clusterable &other) = 0;
/// Subtract other stats.
virtual void Sub(const Clusterable &other) = 0;
/// Scale the stats by a positive number f [not mandatory to supply this].
virtual void Scale(BaseFloat f) {
KALDI_ERR << "This Clusterable object does not implement Scale().";
}
/// Return a string that describes the inherited type.
virtual std::string Type() const = 0;
/// Write data to stream.
virtual void Write(std::ostream &os, bool binary) const = 0;
/// Read data from a stream and return the corresponding object (const
/// function; it's a class member because we need access to the vtable
/// so generic code can read derived types).
virtual Clusterable* ReadNew(std::istream &os, bool binary) const = 0;
virtual ~Clusterable() {}
/// @}
/// \name Functions that have default implementations
/// @{
// These functions have default implementations (but may be overridden for
// speed). Implementatons in tree/clusterable-classes.cc
/// Return the objective function of the combined object this + other.
virtual BaseFloat ObjfPlus(const Clusterable &other) const;
/// Return the objective function of the subtracted object this - other.
virtual BaseFloat ObjfMinus(const Clusterable &other) const;
/// Return the objective function decrease from merging the two
/// clusters, negated to be a positive number (or zero).
virtual BaseFloat Distance(const Clusterable &other) const;
/// @}
};
/// @} end of "ingroup clustering_group"
} // end namespace kaldi
#endif // KALDI_ITF_CLUSTERABLE_ITF_H_
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