/usr/include/shogun/distributions/classical/ProbabilityDistribution.h is in libshogun-dev 3.2.0-7.3build4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* Written (W) 2013 Heiko Strathmann
*/
#ifndef PROBABILITYDISTRIBUTION_H
#define PROBABILITYDISTRIBUTION_H
#include <shogun/base/SGObject.h>
#include <shogun/lib/SGMatrix.h>
namespace shogun
{
template <class T> class SGVector;
/** @brief A base class for representing n-dimensional probability distribution
* over the real numbers (64bit) for which various statistics can be computed
* and which can be sampled.
*/
class CProbabilityDistribution: public CSGObject
{
public:
/** Default constructor */
CProbabilityDistribution();
/** Constructur that sets the distribution's dimension */
CProbabilityDistribution(int32_t dimension);
/** Destructor */
virtual ~CProbabilityDistribution();
/** Samples from the distribution multiple times
*
* @param num_samples number of samples to generate
* @param pre_samples a matrix of pre-samples that might be used for
* sampling. For example, a matrix with standard normal samples for the
* CGaussianDistribution. For reproducible results. Ignored by default.
* @return matrix with samples (column vectors)
*/
virtual SGMatrix<float64_t> sample(int32_t num_samples,
SGMatrix<float64_t> pre_samples=SGMatrix<float64_t>()) const;
/** Samples from the distribution once. Wrapper method. No pre-sample
* passing is possible with this method.
*
* @return vector with single sample
*/
virtual SGVector<float64_t> sample() const;
/** Computes the log-pdf for all provided samples
*
* @param samples samples to compute log-pdf of (column vectors)
* @return vector with log-pdfs of given samples
*/
virtual SGVector<float64_t> log_pdf_multiple(SGMatrix<float64_t> samples) const;
/** Computes the log-pdf for a single provided sample. Wrapper method which
* calls log_pdf_multiple
*
* @param sample_vec sample_vec to compute log-pdf for
* @return log-pdf of the given sample
*/
virtual float64_t log_pdf(SGVector<float64_t> sample_vec) const;
/** @return name of the SGSerializable */
virtual const char* get_name() const=0;
private:
/** Initialses and registers parameters */
void init();
protected:
/** Dimension of the distribution */
int32_t m_dimension;
};
}
#endif // PROBABILITYDISTRIBUTION_H
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