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#ifndef PYP_TOPICS_HH
#define PYP_TOPICS_HH
#include <vector>
#include <iostream>
#include "pyp.hh"
#include "corpus.hh"
class PYPTopics {
public:
typedef std::vector<int> DocumentTopics;
typedef std::vector<DocumentTopics> CorpusTopics;
typedef double F;
public:
PYPTopics(int num_topics, bool use_topic_pyp=false)
: m_num_topics(num_topics), m_word_pyps(1),
m_topic_pyp(0.5,1.0), m_use_topic_pyp(use_topic_pyp) {}
void sample(const Corpus& corpus, int samples);
int sample(const DocumentId& doc, const Term& term);
int max(const DocumentId& doc, const Term& term);
int max_topic() const;
void set_backoff(const std::string& filename) {
m_backoff.reset(new TermBackoff);
m_backoff->read(filename);
m_word_pyps.clear();
m_word_pyps.resize(m_backoff->order(), PYPs());
}
void set_backoff(TermBackoffPtr backoff) {
m_backoff = backoff;
m_word_pyps.clear();
m_word_pyps.resize(m_backoff->order(), PYPs());
}
F prob(const Term& term, int topic, int level=0) const;
void decrement(const Term& term, int topic, int level=0);
void increment(const Term& term, int topic, int level=0);
std::ostream& print_document_topics(std::ostream& out) const;
std::ostream& print_topic_terms(std::ostream& out) const;
private:
F word_pyps_p0(const Term& term, int topic, int level) const;
int m_num_topics;
F m_term_p0, m_topic_p0, m_backoff_p0;
CorpusTopics m_corpus_topics;
typedef std::vector< PYP<int> > PYPs;
PYPs m_document_pyps;
std::vector<PYPs> m_word_pyps;
PYP<int> m_topic_pyp;
bool m_use_topic_pyp;
TermBackoffPtr m_backoff;
};
#endif // PYP_TOPICS_HH
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