Added more python doc strings

tools/python/src/basic.cpp

@@ -145,7 +145,9 @@ void resize(T& v, unsigned long n) { v.resize(n); }
 
 void bind_basic_types() 
 {
-    class_<std::vector<double> >("array", init<>())
+    class_<std::vector<double> >("array", "This object represents a 1D array of floating point numbers. "
+        "Moreover, it binds directly to the C++ type std::vector<double>.", init<>() 
+        )
         .def(vector_indexing_suite<std::vector<double> >())
         .def("__init__", make_constructor(&array_from_object))
         .def("__str__", array__str__)

tools/python/src/matrix.cpp

@@ -193,7 +193,8 @@ void bind_matrix()
         .def("__setitem__", &mat_row__setitem__)
         .def("__getitem__", &mat_row__getitem__);
 
-    class_<matrix<double> >("matrix", init<>())
+    class_<matrix<double> >("matrix", "This object represents a dense 2D matrix of floating point numbers."
+        "Moreover, it binds directly to the C++ type dlib::matrix<double>.", init<>())
         .def("__init__", make_constructor(&make_matrix_from_size))
         .def("set_size", &matrix_set_size, (arg("rows"), arg("cols")), "Set the size of the matrix to the given number of rows and columns.")
         .def("__init__", make_constructor(&from_object))

tools/python/src/sequence_segmenter.cpp

@@ -796,13 +796,15 @@ train_sequence_segmenter() and cross_validate_sequence_segmenter() routines.   "
         .def("__str__",&segmenter_params__str__)
         .def_pickle(serialize_pickle<segmenter_params>());
 
-    class_<segmenter_type> ("segmenter_type")
+    class_<segmenter_type> ("segmenter_type", "This object represents a sequence segmenter and is the type of object "
+        "returned by the dlib.train_sequence_segmenter() routine.")
         .def("__call__", &segmenter_type::segment_sequence_dense)
         .def("__call__", &segmenter_type::segment_sequence_sparse)
         .def_readonly("weights", &segmenter_type::get_weights)
         .def_pickle(serialize_pickle<segmenter_type>());
 
-    class_<segmenter_test> ("segmenter_test")
+    class_<segmenter_test> ("segmenter_test", "This object is the output of the dlib.test_sequence_segmenter() and "
+        "dlib.cross_validate_sequence_segmenter() routines.")
         .def_readwrite("precision", &segmenter_test::precision)
         .def_readwrite("recall", &segmenter_test::recall)
         .def_readwrite("f1", &segmenter_test::f1)