diff options
Diffstat (limited to 'decoder')
| -rw-r--r-- | decoder/tree2string_translator.cc | 17 |
1 files changed, 16 insertions, 1 deletions
diff --git a/decoder/tree2string_translator.cc b/decoder/tree2string_translator.cc index 29caaf8f..c353f7ca 100644 --- a/decoder/tree2string_translator.cc +++ b/decoder/tree2string_translator.cc @@ -126,6 +126,17 @@ namespace std { }; }; +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 = 1; + TailNodeVector tail(1, old_goal_node_idx); + HG::Edge* new_edge = hg->AddEdge(kGOAL_RULE, tail); + hg->ConnectEdgeToHeadNode(new_edge, goal_node); +} + struct Tree2StringTranslatorImpl { vector<boost::shared_ptr<Tree2StringGrammarNode>> root; bool add_pass_through_rules; @@ -308,14 +319,18 @@ struct Tree2StringTranslatorImpl { if (goal_it == x2hg.end()) return false; //cerr << "Goal node: " << goal << endl; hg.TopologicallySortNodesAndEdges(goal_it->second); - hg.Reweight(weights); // there might be nodes that cannot be derived // the following takes care of them vector<bool> prune(hg.edges_.size(), false); hg.PruneEdges(prune, true); if (hg.edges_.size() == 0) return false; + // rescoring assumes the goal edge is arity 1 (code laziness), add that here + AddDummyGoalNode(&hg); + + hg.Reweight(weights); //hg.PrintGraphviz(); + minus_lm_forest->swap(hg); return true; } |