From 567f2bd17c05d31cd8a9b9d351f9030cddf53cb7 Mon Sep 17 00:00:00 2001
From: Patrick Simianer <p@simianer.de>
Date: Wed, 9 Jul 2014 15:26:00 +0200
Subject: c++ implementation

---
 fast/hypergraph.cc | 161 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 161 insertions(+)
 create mode 100644 fast/hypergraph.cc

(limited to 'fast/hypergraph.cc')

diff --git a/fast/hypergraph.cc b/fast/hypergraph.cc
new file mode 100644
index 0000000..08b4d05
--- /dev/null
+++ b/fast/hypergraph.cc
@@ -0,0 +1,161 @@
+#include "hypergraph.hh"
+
+namespace Hg {
+
+
+/*
+ * Node
+ * methods
+ *
+ */
+string
+Node::s()
+{
+  ostringstream os;
+  os << \
+    "Node<id=" << this->id << \
+    ", symbol=" << this->symbol << \
+    ", span=(" << this->left << "," << this->right << ")" \
+    ", outgoing:" << this->outgoing.size() << \
+    ", incoming:" << this->incoming.size() << ">";
+  return os.str();
+}
+
+/*
+ * Hyperedge
+ * methods
+ *
+ */
+unsigned int
+Hyperedge::arity()
+{
+  return this->arity_;
+}
+
+bool
+Hyperedge::is_marked()
+{
+  return (this->arity_ == this->mark);
+}
+
+string
+Hyperedge::s()
+{
+  ostringstream os;
+  vector<unsigned int> tails_ids;
+  ostringstream _;
+  for_each(this->tails.begin(), this->tails.end(), [&_](Node* n) { _ << n->id; _ << ","; });
+  os << \
+    "Hyperedge<head=" << this->head->id << \
+    ", rule:'" << "TODO" << \
+    "', tails=" << _.str() << \
+    ", arity=" << this->arity() << \
+    ", score=" << this->score << \
+    " , f=" << "TODO" << \
+    ", mark=" << this->mark << ">";
+  return os.str();
+}
+
+
+/*
+ * Hypergraph
+ * methods
+ *
+ */
+unsigned int
+Hypergraph::arity()
+{
+  // TODO
+  return 0;
+}
+
+void
+Hypergraph::reset()
+{
+}
+
+string
+Hypergraph::s()
+{
+  // TODO
+  return "";
+}
+
+string
+Hypergraph::json_s()
+{
+  // TODO
+  return "";
+}
+
+/*
+ * functions
+ *
+ */
+vector<Node*>
+topological_sort(vector<Node*>& nodes)
+{
+  vector<Node*> sorted;
+  vector<Node*> tmp;
+  for_each(nodes.begin(), nodes.end(), [&tmp](Node* n) -> void { if (n->incoming.size()==0) tmp.push_back(n); });
+  while (!tmp.empty()) {
+    Node* n = tmp.front();
+    cout << n->id << endl;
+    tmp.erase(tmp.begin());
+    sorted.push_back(n);
+    for (auto it = n->outgoing.begin(); it !=  n->outgoing.end(); it++) { // edges
+      if ((*it)->is_marked()) {
+        continue;
+      }
+      (*it)->mark++;
+      bool add = true;
+      for (auto jt = (*it)->head->incoming.begin(); jt != (*it)->head->incoming.end(); jt++) {
+        if (!(*jt)->is_marked()) {
+          add = false;
+          break;
+        }
+      }
+      if (add==true)  {
+        tmp.push_back( (*it)->head );
+        cout << " " <<  (*it)->head->id<< endl;
+      }
+    }
+  }
+  return sorted;
+}
+
+void
+init(vector<Node*>& nodes, ViterbiSemiring<double>& semiring, Node* root)
+{
+  for (auto it = nodes.begin(); it != nodes.end(); ++it)
+    (*it)->score = semiring.null;
+  root->score = semiring.one;
+}
+
+void
+viterbi(vector<Node*>& nodes, map<unsigned int, Hg::Node*> nodes_by_id, Node* root)
+{
+  vector<Node*> sorted = topological_sort(nodes);
+  ViterbiSemiring<double> semiring;
+
+  init(sorted, semiring, root);
+  
+  for (auto n_it = sorted.begin(); n_it != sorted.end(); ++n_it) {
+    for (auto e_it = (*n_it)->incoming.begin(); e_it != (*n_it)->incoming.end(); ++e_it) {
+      cout << (*e_it)->s() << endl;
+      double s = semiring.one;
+      for (auto m_it = (*e_it)->tails.begin(); m_it != (*e_it)->tails.end(); m_it++) {
+        s = semiring.multiply(s, (*m_it)->score);
+      }
+      (*n_it)->score = semiring.add((*n_it)->score, semiring.multiply(s, (*e_it)->score));
+    }
+  }
+
+  for (auto it = sorted.begin(); it != sorted.end(); ++it) {
+    cout << (*it)->id << " " <<  (*it)->score << endl;
+  }
+}
+
+
+} // namespace
+
-- 
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