From c7d1b04980d9d90458625a7f8e92985c7409a78d Mon Sep 17 00:00:00 2001
From: Chris Dyer <cdyer@cs.cmu.edu>
Date: Sun, 29 Jul 2012 21:04:14 -0400
Subject: fix grammar converter to remove edges that cannot exist in any valid
 derivation

---
 decoder/hg_io.cc | 1 +
 1 file changed, 1 insertion(+)

(limited to 'decoder/hg_io.cc')

diff --git a/decoder/hg_io.cc b/decoder/hg_io.cc
index bfb2fb80..8bd40387 100644
--- a/decoder/hg_io.cc
+++ b/decoder/hg_io.cc
@@ -261,6 +261,7 @@ static void WriteRule(const TRule& r, ostream* out) {
 }
 
 bool HypergraphIO::WriteToJSON(const Hypergraph& hg, bool remove_rules, ostream* out) {
+  if (hg.empty()) { *out << "{}\n"; return true; }
   map<const TRule*, int> rid;
   ostream& o = *out;
   rid[NULL] = 0;
-- 
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