From b9be57140b1e9cab50ff8eb0c6cd90815ab6da0e Mon Sep 17 00:00:00 2001
From: Patrick Simianer <p@simianer.de>
Date: Tue, 19 Aug 2014 21:51:44 +0100
Subject: [PATCH] added minimal decoder

---
 .gitignore                 |  1 +
 decoder/Makefile.am        |  5 ++++-
 decoder/minimal_decoder.cc | 45 +++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 50 insertions(+), 1 deletion(-)
 create mode 100644 decoder/minimal_decoder.cc

diff --git a/.gitignore b/.gitignore
index 72f4997..0c78530 100644
--- a/.gitignore
+++ b/.gitignore
@@ -42,6 +42,7 @@ decoder/ff_test
 decoder/grammar_test
 decoder/hg_test
 decoder/logval_test
+decoder/minimal_decoder
 decoder/parser_test
 decoder/rule_lexer.cc
 decoder/small_vector_test
diff --git a/decoder/Makefile.am b/decoder/Makefile.am
index 8e61c13..9c4c714 100644
--- a/decoder/Makefile.am
+++ b/decoder/Makefile.am
@@ -1,4 +1,4 @@
-bin_PROGRAMS = cdec
+bin_PROGRAMS = cdec minimal_decoder
 
 noinst_PROGRAMS = \
   trule_test \
@@ -23,6 +23,9 @@ cdec_SOURCES = cdec.cc
 cdec_LDFLAGS= -rdynamic
 cdec_LDADD = libcdec.a ../mteval/libmteval.a ../utils/libutils.a ../klm/search/libksearch.a ../klm/lm/libklm.a ../klm/util/libklm_util.a ../klm/util/double-conversion/libklm_util_double.a
 
+minimal_decoder_SOURCES = minimal_decoder.cc
+minimal_decoder_LDADD = libcdec.a ../utils/libutils.a
+
 AM_CPPFLAGS = -DTEST_DATA=\"$(top_srcdir)/decoder/test_data\" -DBOOST_TEST_DYN_LINK -W -Wno-sign-compare -I$(top_srcdir) -I$(top_srcdir)/mteval -I$(top_srcdir)/utils -I$(top_srcdir)/klm
 
 rule_lexer.cc: rule_lexer.ll
diff --git a/decoder/minimal_decoder.cc b/decoder/minimal_decoder.cc
new file mode 100644
index 0000000..0aa281a
--- /dev/null
+++ b/decoder/minimal_decoder.cc
@@ -0,0 +1,45 @@
+#include <fstream>
+#include <iostream>
+#include <sstream>
+
+#include "fdict.h"
+#include "filelib.h"
+#include "hg.h"
+#include "hg_io.h"
+#include "sparse_vector.h"
+#include "viterbi.h"
+
+
+using namespace std;
+
+/*
+ * Reads hypergraph from JSON file argv[1],
+ * reweights it using weights from argv[2],
+ * and outputs viterbi translation.
+ *
+ */
+int main(int argc, char** argv)
+{
+  ReadFile rf(argv[1]);
+  Hypergraph hg;
+  HypergraphIO::ReadFromJSON(rf.stream(), &hg);
+  SparseVector<double> v;
+  ifstream f(argv[2]);
+  string line;
+  while (getline(f, line)) {
+    istringstream ss(line);
+    string k; weight_t w;
+    ss >> k >> w;
+    v.add_value(FD::Convert(k), w);
+  }
+  hg.Reweight(v);
+  clock_t begin = clock();
+  hg.TopologicallySortNodesAndEdges(hg.NumberOfNodes()-1);
+  vector<WordID> trans;
+  ViterbiESentence(hg, &trans);
+  cout << TD::GetString(trans) << endl << flush;
+  clock_t end = clock();
+  double elapsed_secs = double(end - begin) / CLOCKS_PER_SEC;
+  cout << elapsed_secs << " s" << endl;
+}
+