Update synthetic environment

tests/test_synthetic.py

@@ -13,15 +13,15 @@ print("library path: {:}".format(lib_dir))
 if str(lib_dir) not in sys.path:
     sys.path.insert(0, str(lib_dir))
 
-from datasets import QuadraticFunction
+from datasets import QuadraticFunc
 from datasets import SynAdaptiveEnv
 
 
-class TestQuadraticFunction(unittest.TestCase):
+class TestQuadraticFunc(unittest.TestCase):
     """Test the quadratic function."""
 
     def test_simple(self):
-        function = QuadraticFunction([[0, 1], [0.5, 4], [1, 1]])
+        function = QuadraticFunc([[0, 1], [0.5, 4], [1, 1]])
         print(function)
         for x in (0, 0.5, 1):
             print("f({:})={:}".format(x, function[x]))
@@ -31,7 +31,7 @@ class TestQuadraticFunction(unittest.TestCase):
         self.assertTrue(abs(function[1] - 1) < thresh)
 
     def test_none(self):
-        function = QuadraticFunction()
+        function = QuadraticFunc()
         function.fit([[0, 1], [0.5, 4], [1, 1]], max_iter=3000, verbose=True)
         print(function)
         thresh = 0.2