From ee84ab027c0be54800cac0c9bff62dd097354f6d Mon Sep 17 00:00:00 2001
From: Chris Dyer <cdyer@cs.cmu.edu>
Date: Wed, 12 Oct 2011 14:57:15 +0100
Subject: model lenght properly, clean up

---
 gi/pf/monotonic_pseg.h | 88 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 88 insertions(+)
 create mode 100644 gi/pf/monotonic_pseg.h

(limited to 'gi/pf/monotonic_pseg.h')

diff --git a/gi/pf/monotonic_pseg.h b/gi/pf/monotonic_pseg.h
new file mode 100644
index 00000000..7e6af3fc
--- /dev/null
+++ b/gi/pf/monotonic_pseg.h
@@ -0,0 +1,88 @@
+#ifndef _MONOTONIC_PSEG_H_
+#define _MONOTONIC_PSEG_H_
+
+#include <vector>
+
+#include "prob.h"
+#include "ccrp_nt.h"
+#include "trule.h"
+#include "base_measures.h"
+
+struct MonotonicParallelSegementationModel {
+  explicit MonotonicParallelSegementationModel(PhraseJointBase& rcp0) :
+    rp0(rcp0), base(prob_t::One()), rules(1,1), stop(1.0) {}
+
+  void DecrementRule(const TRule& rule) {
+    if (rules.decrement(rule))
+      base /= rp0(rule);
+  }
+
+  void IncrementRule(const TRule& rule) {
+    if (rules.increment(rule))
+      base *= rp0(rule);
+  }
+
+  void IncrementRulesAndStops(const std::vector<TRulePtr>& rules) {
+    for (int i = 0; i < rules.size(); ++i)
+      IncrementRule(*rules[i]);
+    if (rules.size()) IncrementContinue(rules.size() - 1);
+    IncrementStop();
+  }
+
+  void DecrementRulesAndStops(const std::vector<TRulePtr>& rules) {
+    for (int i = 0; i < rules.size(); ++i)
+      DecrementRule(*rules[i]);
+    if (rules.size()) {
+      DecrementContinue(rules.size() - 1);
+      DecrementStop();
+    }
+  }
+
+  prob_t RuleProbability(const TRule& rule) const {
+    prob_t p; p.logeq(rules.logprob(rule, log(rp0(rule))));
+    return p;
+  }
+
+  prob_t Likelihood() const {
+    prob_t p = base;
+    prob_t q; q.logeq(rules.log_crp_prob());
+    p *= q;
+    q.logeq(stop.log_crp_prob());
+    p *= q;
+    return p;
+  }
+
+  void IncrementStop() {
+    stop.increment(true);
+  }
+
+  void IncrementContinue(int n = 1) {
+    for (int i = 0; i < n; ++i)
+      stop.increment(false);
+  }
+
+  void DecrementStop() {
+    stop.decrement(true);
+  }
+
+  void DecrementContinue(int n = 1) {
+    for (int i = 0; i < n; ++i)
+      stop.decrement(false);
+  }
+
+  prob_t StopProbability() const {
+    return prob_t(stop.prob(true, 0.5));
+  }
+
+  prob_t ContinueProbability() const {
+    return prob_t(stop.prob(false, 0.5));
+  }
+
+  const PhraseJointBase& rp0;
+  prob_t base;
+  CCRP_NoTable<TRule> rules;
+  CCRP_NoTable<bool> stop;
+};
+
+#endif
+
-- 
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