RDSE: serialization for py bindings

bindings/py/cpp_src/bindings/encoders/py_RDSE.cpp

@@ -17,12 +17,14 @@
 
 #include <bindings/suppress_register.hpp>  //include before pybind11.h
 #include <pybind11/pybind11.h>
+#include <pybind11/iostream.h>
 
 #include <htm/encoders/RandomDistributedScalarEncoder.hpp>
 
 namespace py = pybind11;
 
 using namespace htm;
+using namespace std;
 
 namespace htm_ext
 {
@@ -113,5 +115,37 @@ fields are filled in automatically.)");
             self.encode(value, *sdr);
             return sdr;
         });
+
+
+	// Serialization
+	// loadFromString
+        py_RDSE.def("loadFromString", [](RDSE& self, const py::bytes& inString) {
+          std::stringstream inStream(inString.cast<std::string>());
+          self.load(inStream);
+        });
+
+        // writeToString
+        py_RDSE.def("writeToString", [](const RDSE& self) {
+          std::ostringstream os;
+          os.flags(ios::scientific);
+          os.precision(numeric_limits<double>::digits10 + 1);
+          self.save(os);
+          return py::bytes( os.str() );
+       });
+
+	// pickle
+        py_RDSE.def(py::pickle(
+          [](const RDSE& self) {
+            std::stringstream ss;
+            self.save(ss);
+            return py::bytes( ss.str() );
+          },
+          [](py::bytes &s) {
+            std::stringstream ss( s.cast<std::string>() );
+            RDSE self;
+            self.load(ss);
+            return self;
+        }));
+
     }
 }

bindings/py/tests/encoders/rdse_test.py

@@ -255,6 +255,44 @@ def testSeed(self):
         B = R.encode( 987654 )
         assert( A != B )
 
-    @unittest.skip(reason="Known issue: https://github.com/htm-community/htm.core/issues/160")
-    def testPickle(self):
-        assert(False) # TODO: Unimplemented
+
+     def testPickle(self):
+        """
+        The pickling is successfull if pickle serializes and de-serialize the
+        RDSE object. 
+        Moreover, the de-serialized object shall give the same SDR than the 
+        original encoder given the same scalar value to encode.
+        """        
+        rdse_params = RDSE_Parameters()
+        rdse_params.sparsity = 0.1
+        rdse_params.size = 100
+        rdse_params.resolution = 0.1
+        rdse_params.seed = 1997
+
+        rdse = RDSE(rdse_params)
+        filename = "RDSE_testPickle"
+
+        try:
+            with open(filename, "wb") as f:
+                pickle.dump(rdse, f)
+        except:
+            dump_success = False
+        else:
+            dump_success = True
+
+        assert(dump_success)
+
+        try:
+            with open(filename, "rb") as f:
+                rdse_loaded = pickle.load(f)
+        except:
+            read_success = False
+        else:
+            read_success = True
+
+        assert(read_success)
+        value_to_encode = 69003        
+        SDR_original = rdse.encode(value_to_encode)
+        SDR_loaded = rdse_loaded.encode(value_to_encode)
+
+        assert(SDR_original == SDR_loaded)