Added an error correction oracle for morpho

transition_machine/src/Oracle.cpp

@@ -129,6 +129,48 @@ void Oracle::createDatabase()
     return 0;
   })));
 
+  str2oracle.emplace("error_morpho", std::unique_ptr<Oracle>(new Oracle(
+  [](Oracle *)
+  {
+  },
+  [](Config & c, Oracle *)
+  {
+    if (c.getCurrentStateHistory().size() >= 2 && (c.getCurrentStateHistory().back() == "BACK" || c.getCurrentStateHistory()[c.getCurrentStateHistory().size()-2] == "BACK"))
+      return std::string("EPSILON");
+
+    if (c.getCurrentStateHistory().size() < 2)
+      return std::string("EPSILON");
+
+    //return std::string("BACK 1");
+
+    auto & morpho = c.getTape("MORPHO");
+
+    if (c.head <= 0)
+      return std::string("EPSILON");
+
+    auto & morphoRef = morpho.ref[c.head-1];
+    auto & morpho0 = morpho[c.head-1];
+    auto & morpho1 = morpho[c.head];
+
+    if (morpho0 == morphoRef)
+      return std::string("EPSILON");
+
+    auto & genre0 = split(morpho0, '|')[0];
+    auto & genre1 = split(morpho1, '|')[0];
+
+    if (genre0 == "g=f" && genre1 == "g=m")
+      return std::string("BACK 1");
+
+    if (genre0 == "g=m" && genre1 == "g=f")
+      return std::string("BACK 1");
+
+    return std::string("EPSILON");
+  },
+  [](Config &, Oracle *, const std::string &)
+  {
+    return 0;
+  })));
+
   str2oracle.emplace("tagger", std::unique_ptr<Oracle>(new Oracle(
   [](Oracle *)
   {