From 1b8181bf0d6e9137e6b9ccdbe414aec37377a1a9 Mon Sep 17 00:00:00 2001
From: Chris Dyer <cdyer@allegro.clab.cs.cmu.edu>
Date: Sun, 18 Nov 2012 13:35:42 -0500
Subject: major restructure of the training code

---
 word-aligner/ttables.h | 101 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 101 insertions(+)
 create mode 100644 word-aligner/ttables.h

(limited to 'word-aligner/ttables.h')

diff --git a/word-aligner/ttables.h b/word-aligner/ttables.h
new file mode 100644
index 00000000..9baa13ca
--- /dev/null
+++ b/word-aligner/ttables.h
@@ -0,0 +1,101 @@
+#ifndef _TTABLES_H_
+#define _TTABLES_H_
+
+#include <iostream>
+#include <tr1/unordered_map>
+
+#include "sparse_vector.h"
+#include "m.h"
+#include "wordid.h"
+#include "tdict.h"
+
+class TTable {
+ public:
+  TTable() {}
+  typedef std::tr1::unordered_map<WordID, double> Word2Double;
+  typedef std::tr1::unordered_map<WordID, Word2Double> Word2Word2Double;
+  inline double prob(const int& e, const int& f) const {
+    const Word2Word2Double::const_iterator cit = ttable.find(e);
+    if (cit != ttable.end()) {
+      const Word2Double& cpd = cit->second;
+      const Word2Double::const_iterator it = cpd.find(f);
+      if (it == cpd.end()) return 1e-9;
+      return it->second;
+    } else {
+      return 1e-9;
+    }
+  }
+  inline void Increment(const int& e, const int& f) {
+    counts[e][f] += 1.0;
+  }
+  inline void Increment(const int& e, const int& f, double x) {
+    counts[e][f] += x;
+  }
+  void NormalizeVB(const double alpha) {
+    ttable.swap(counts);
+    for (Word2Word2Double::iterator cit = ttable.begin();
+         cit != ttable.end(); ++cit) {
+      double tot = 0;
+      Word2Double& cpd = cit->second;
+      for (Word2Double::iterator it = cpd.begin(); it != cpd.end(); ++it)
+        tot += it->second + alpha;
+      for (Word2Double::iterator it = cpd.begin(); it != cpd.end(); ++it)
+        it->second = exp(Md::digamma(it->second + alpha) - Md::digamma(tot));
+    }
+    counts.clear();
+  }
+  void Normalize() {
+    ttable.swap(counts);
+    for (Word2Word2Double::iterator cit = ttable.begin();
+         cit != ttable.end(); ++cit) {
+      double tot = 0;
+      Word2Double& cpd = cit->second;
+      for (Word2Double::iterator it = cpd.begin(); it != cpd.end(); ++it)
+        tot += it->second;
+      for (Word2Double::iterator it = cpd.begin(); it != cpd.end(); ++it)
+        it->second /= tot;
+    }
+    counts.clear();
+  }
+  // adds counts from another TTable - probabilities remain unchanged
+  TTable& operator+=(const TTable& rhs) {
+    for (Word2Word2Double::const_iterator it = rhs.counts.begin();
+         it != rhs.counts.end(); ++it) {
+      const Word2Double& cpd = it->second;
+      Word2Double& tgt = counts[it->first];
+      for (Word2Double::const_iterator j = cpd.begin(); j != cpd.end(); ++j) {
+        tgt[j->first] += j->second;
+      }
+    }
+    return *this;
+  }
+  void ShowTTable() const {
+    for (Word2Word2Double::const_iterator it = ttable.begin(); it != ttable.end(); ++it) {
+      const Word2Double& cpd = it->second;
+      for (Word2Double::const_iterator j = cpd.begin(); j != cpd.end(); ++j) {
+        std::cerr << "P(" << TD::Convert(j->first) << '|' << TD::Convert(it->first) << ") = " << j->second << std::endl;
+      }
+    }
+  }
+  void ShowCounts() const {
+    for (Word2Word2Double::const_iterator it = counts.begin(); it != counts.end(); ++it) {
+      const Word2Double& cpd = it->second;
+      for (Word2Double::const_iterator j = cpd.begin(); j != cpd.end(); ++j) {
+        std::cerr << "c(" << TD::Convert(j->first) << '|' << TD::Convert(it->first) << ") = " << j->second << std::endl;
+      }
+    }
+  }
+  void DeserializeProbsFromText(std::istream* in);
+  void SerializeCounts(std::string* out) const { SerializeHelper(out, counts); }
+  void DeserializeCounts(const std::string& in) { DeserializeHelper(in, &counts); }
+  void SerializeProbs(std::string* out) const { SerializeHelper(out, ttable); }
+  void DeserializeProbs(const std::string& in) { DeserializeHelper(in, &ttable); }
+ private:
+  static void SerializeHelper(std::string*, const Word2Word2Double& o);
+  static void DeserializeHelper(const std::string&, Word2Word2Double* o);
+ public:
+  Word2Word2Double ttable;
+  Word2Word2Double counts;
+};
+
+#endif
-- 
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