Reformulate the synthetic codes

tests/test_synthetic_utils.py

@@ -0,0 +1,61 @@
+#####################################################
+# Copyright (c) Xuanyi Dong [GitHub D-X-Y], 2021.03 #
+#####################################################
+# pytest tests/test_synthetic_utils.py -s           #
+#####################################################
+import sys, random
+import unittest
+import pytest
+from pathlib import Path
+
+lib_dir = (Path(__file__).parent / ".." / "lib").resolve()
+print("library path: {:}".format(lib_dir))
+if str(lib_dir) not in sys.path:
+    sys.path.insert(0, str(lib_dir))
+
+from datasets import QuadraticFunc
+from datasets import ConstantGenerator, SinGenerator
+
+
+class TestQuadraticFunc(unittest.TestCase):
+    """Test the quadratic function."""
+
+    def test_simple(self):
+        function = QuadraticFunc([[0, 1], [0.5, 4], [1, 1]])
+        print(function)
+        for x in (0, 0.5, 1):
+            print("f({:})={:}".format(x, function[x]))
+        thresh = 0.2
+        self.assertTrue(abs(function[0] - 1) < thresh)
+        self.assertTrue(abs(function[0.5] - 4) < thresh)
+        self.assertTrue(abs(function[1] - 1) < thresh)
+
+    def test_none(self):
+        function = QuadraticFunc()
+        function.fit([[0, 1], [0.5, 4], [1, 1]], max_iter=3000, verbose=True)
+        print(function)
+        thresh = 0.2
+        self.assertTrue(abs(function[0] - 1) < thresh)
+        self.assertTrue(abs(function[0.5] - 4) < thresh)
+        self.assertTrue(abs(function[1] - 1) < thresh)
+
+
+class TestConstantGenerator(unittest.TestCase):
+    """Test the constant data generator."""
+
+    def test_simple(self):
+        dataset = ConstantGenerator()
+        for i, (idx, t, x) in enumerate(dataset):
+            assert i == idx, "First loop: {:} vs {:}".format(i, idx)
+            assert x == 0.1
+
+
+class TestSinGenerator(unittest.TestCase):
+    """Test the synethtic data generator."""
+
+    def test_simple(self):
+        dataset = SinGenerator()
+        for i, (idx, t, x) in enumerate(dataset):
+            assert i == idx, "First loop: {:} vs {:}".format(i, idx)
+        for i, (idx, t, x) in enumerate(dataset):
+            assert i == idx, "Second loop: {:} vs {:}".format(i, idx)