From 4ebb11b25cf87dc5938b5eb65e884d0e3f4ee146 Mon Sep 17 00:00:00 2001
From: Chris Dyer <cdyer@cs.cmu.edu>
Date: Mon, 23 Jan 2012 15:47:29 -0500
Subject: more alignment stuff

---
 gi/pf/conditional_pseg.h | 74 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 74 insertions(+)

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

diff --git a/gi/pf/conditional_pseg.h b/gi/pf/conditional_pseg.h
index edcdc813..db951d15 100644
--- a/gi/pf/conditional_pseg.h
+++ b/gi/pf/conditional_pseg.h
@@ -8,10 +8,84 @@
 
 #include "prob.h"
 #include "ccrp_nt.h"
+#include "mfcr.h"
 #include "trule.h"
 #include "base_measures.h"
 #include "tdict.h"
 
+template <typename ConditionalBaseMeasure>
+struct MConditionalTranslationModel {
+  explicit MConditionalTranslationModel(ConditionalBaseMeasure& rcp0) :
+    rp0(rcp0), lambdas(1, 1.0), p0s(1) {}
+
+  void Summary() const {
+    std::cerr << "Number of conditioning contexts: " << r.size() << std::endl;
+    for (RuleModelHash::const_iterator it = r.begin(); it != r.end(); ++it) {
+      std::cerr << TD::GetString(it->first) << "   \t(d=" << it->second.d() << ",\\alpha = " << it->second.alpha() << ") --------------------------" << std::endl;
+      for (MFCR<TRule>::const_iterator i2 = it->second.begin(); i2 != it->second.end(); ++i2)
+        std::cerr << "   " << -1 << '\t' << i2->first << std::endl;
+    }
+  }
+
+  void ResampleHyperparameters(MT19937* rng) {
+    for (RuleModelHash::iterator it = r.begin(); it != r.end(); ++it)
+      it->second.resample_hyperparameters(rng);
+  } 
+
+  int DecrementRule(const TRule& rule, MT19937* rng) {
+    RuleModelHash::iterator it = r.find(rule.f_);
+    assert(it != r.end());
+    const TableCount delta = it->second.decrement(rule, rng);
+    if (delta.count) {
+      if (it->second.num_customers() == 0) r.erase(it);
+    }
+    return delta.count;
+  }
+
+  int IncrementRule(const TRule& rule, MT19937* rng) {
+    RuleModelHash::iterator it = r.find(rule.f_);
+    if (it == r.end()) {
+      it = r.insert(make_pair(rule.f_, MFCR<TRule>(1, 1.0, 1.0, 1.0, 1.0, 1e-9, 4.0))).first;
+    }
+    p0s[0] = rp0(rule).as_float(); 
+    TableCount delta = it->second.increment(rule, p0s, lambdas, rng);
+    return delta.count;
+  }
+
+  prob_t RuleProbability(const TRule& rule) const {
+    prob_t p;
+    RuleModelHash::const_iterator it = r.find(rule.f_);
+    if (it == r.end()) {
+      p.logeq(log(rp0(rule)));
+    } else {
+      p0s[0] = rp0(rule).as_float();
+      p = prob_t(it->second.prob(rule, p0s, lambdas));
+    }
+    return p;
+  }
+
+  prob_t Likelihood() const {
+    prob_t p = prob_t::One();
+#if 0
+    for (RuleModelHash::const_iterator it = r.begin(); it != r.end(); ++it) {
+      prob_t q; q.logeq(it->second.log_crp_prob());
+      p *= q;
+      for (CCRP_NoTable<TRule>::const_iterator i2 = it->second.begin(); i2 != it->second.end(); ++i2)
+        p *= rp0(i2->first);
+    }
+#endif
+    return p;
+  }
+
+  const ConditionalBaseMeasure& rp0;
+  typedef std::tr1::unordered_map<std::vector<WordID>,
+                                  MFCR<TRule>,
+                                  boost::hash<std::vector<WordID> > > RuleModelHash;
+  RuleModelHash r;
+  std::vector<double> lambdas;
+  mutable std::vector<double> p0s;
+};
+
 template <typename ConditionalBaseMeasure>
 struct ConditionalTranslationModel {
   explicit ConditionalTranslationModel(ConditionalBaseMeasure& rcp0) :
-- 
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