diff --git a/src/pomdp/tracker.cpp b/src/pomdp/tracker.cpp
index 63c9d33..cffae0e 100644
--- a/src/pomdp/tracker.cpp
+++ b/src/pomdp/tracker.cpp
@@ -8,6 +8,8 @@ template<typename ValueType> using SparsePomdp = storm::models::sparse::Pomdp<Va
 template<typename ValueType> using SparsePomdpTracker = storm::generator::BeliefSupportTracker<ValueType>;
 
 template<typename ValueType> using NDPomdpTrackerSparse = storm::generator::NondeterministicBeliefTracker<double, storm::generator::SparseBeliefState<double>>;
+template<typename ValueType> using NDPomdpTrackerDense = storm::generator::NondeterministicBeliefTracker<double, storm::generator::ObservationDenseBeliefState<double>>;
+
 
 void define_tracker(py::module& m) {
     py::class_<storm::generator::BeliefSupportTracker<double>> tracker(m, "BeliefSupportTrackerDouble", "Tracker for BeliefSupports");
@@ -20,6 +22,11 @@ void define_tracker(py::module& m) {
     sbel.def_property_readonly("risk", &storm::generator::SparseBeliefState<double>::getRisk);
     sbel.def("__str__", &storm::generator::SparseBeliefState<double>::toString);
     sbel.def_property_readonly("is_valid", &storm::generator::SparseBeliefState<double>::isValid);
+//
+//    py::class_<storm::generator::ObservationDenseBeliefState<double>> dbel(m, "DenseBeliefStateDouble", "Belief state in dense format");
+//    dbel.def("get", &storm::generator::ObservationDenseBeliefState<double>::get, py::arg("state"));
+//    dbel.def_property_readonly("risk", &storm::generator::ObservationDenseBeliefState<double>::getRisk);
+//    dbel.def("__str__", &storm::generator::ObservationDenseBeliefState<double>::toString);
 
     py::class_<NDPomdpTrackerSparse<double>> ndetbelieftracker(m, "NondeterministicBeliefTrackerDoubleSparse", "Tracker for belief states and uncontrollable actions");
     ndetbelieftracker.def(py::init<SparsePomdp<double> const&>(), py::arg("pomdp"));
@@ -29,5 +36,17 @@ void define_tracker(py::module& m) {
     ndetbelieftracker.def("track", &NDPomdpTrackerSparse<double>::track, py::arg("observation"));
     ndetbelieftracker.def("obtain_beliefs", &NDPomdpTrackerSparse<double>::getCurrentBeliefs);
     ndetbelieftracker.def("obtain_last_observation", &NDPomdpTrackerSparse<double>::getCurrentObservation);
+    ndetbelieftracker.def("reduce",&NDPomdpTrackerSparse<double>::reduce);
+
+
+//    py::class_<NDPomdpTrackerDense<double>> ndetbelieftrackerd(m, "NondeterministicBeliefTrackerDoubleDense", "Tracker for belief states and uncontrollable actions");
+//    ndetbelieftrackerd.def(py::init<SparsePomdp<double> const&>(), py::arg("pomdp"));
+//    ndetbelieftrackerd.def("reset", &NDPomdpTrackerDense<double>::reset);
+//    ndetbelieftrackerd.def("set_risk", &NDPomdpTrackerDense<double>::setRisk, py::arg("risk"));
+//    ndetbelieftrackerd.def("obtain_current_risk",&NDPomdpTrackerDense<double>::getCurrentRisk, py::arg("max")=true);
+//    ndetbelieftrackerd.def("track", &NDPomdpTrackerDense<double>::track, py::arg("observation"));
+//    ndetbelieftrackerd.def("obtain_beliefs", &NDPomdpTrackerDense<double>::getCurrentBeliefs);
+//    ndetbelieftrackerd.def("obtain_last_observation", &NDPomdpTrackerDense<double>::getCurrentObservation);
+//    ndetbelieftrackerd.def("reduce",&NDPomdpTrackerDense<double>::reduce);
 
 }
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