From d033a045aa46ff876ad2c9f6929e2095b2481cdf Mon Sep 17 00:00:00 2001
From: Chris Dyer <redpony@gmail.com>
Date: Fri, 25 Apr 2014 23:45:32 -0400
Subject: check for non-rescorable hypergraphs

---
 training/utils/grammar_convert.cc | 16 ++++++++++++----
 1 file changed, 12 insertions(+), 4 deletions(-)

(limited to 'training')

diff --git a/training/utils/grammar_convert.cc b/training/utils/grammar_convert.cc
index 58d1957c..5c1b4d4a 100644
--- a/training/utils/grammar_convert.cc
+++ b/training/utils/grammar_convert.cc
@@ -56,15 +56,22 @@ int GetOrCreateNode(const WordID& lhs, map<WordID, int>* lhs2node, Hypergraph* h
   return node_id - 1;
 }
 
+void AddDummyGoalNode(Hypergraph* hg) {
+  static const int kGOAL = -TD::Convert("Goal");
+  static TRulePtr kGOAL_RULE(new TRule("[Goal] ||| [X] ||| [1]"));
+  unsigned old_goal_node_idx = hg->nodes_.size() - 1;
+  HG::Node* goal_node = hg->AddNode(kGOAL);
+  goal_node->node_hash = goal_node->id_ * 10 + 1;
+  TailNodeVector tail(1, old_goal_node_idx);
+  HG::Edge* new_edge = hg->AddEdge(kGOAL_RULE, tail);
+  hg->ConnectEdgeToHeadNode(new_edge, goal_node);
+}
+
 void FilterAndCheckCorrectness(int goal, Hypergraph* hg) {
   if (goal < 0) {
     cerr << "Error! [S] not found in grammar!\n";
     exit(1);
   }
-  if (hg->nodes_[goal].in_edges_.size() != 1) {
-    cerr << "Error! [S] has more than one rewrite!\n";
-    exit(1);
-  }
   int old_size = hg->nodes_.size();
   hg->TopologicallySortNodesAndEdges(goal);
   if (hg->nodes_.size() != old_size) {
@@ -319,6 +326,7 @@ int main(int argc, char **argv) {
       if (line.empty()) {
         int goal = lhs2node[kSTART] - 1;
         FilterAndCheckCorrectness(goal, &hg);
+        AddDummyGoalNode(&hg);
         ProcessHypergraph(w, conf, "", &hg);
         hg.clear();
         lhs2node.clear();
-- 
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