track node state for smarter union

1 files changed, 5 insertions, 0 deletions

diff --git a/decoder/lexalign.cc b/decoder/lexalign.cc
index 6adb1892..11f20de7 100644
--- a/decoder/lexalign.cc
+++ b/decoder/lexalign.cc
@@ -124,6 +124,11 @@ bool LexicalAlign::TranslateImpl(const string& input,
   pimpl_->BuildTrellis(lattice, *smeta, forest);
   forest->is_linear_chain_ = true;
   forest->Reweight(weights);
+  // since we don't do any pruning, the node_hash will be the same for
+  // every run of the composer
+  int nc = 0;
+  for (auto& node : forest->nodes_)
+    node.node_hash = ++nc;
   return true;
 }