Created RBF network tests for numpy. Test for gaussian function.

NP_Implementation/tests/test_RBF_np.py

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+import unittest
+import numpy as np
+
+from RBF_numpy import RBFNetwork
+
+class TestRBFNetwork(unittest.TestCase):
+    def setUp(self):
+        """Set up an RBFNetwork instance for testing."""
+        self.input_dim = 3
+        self.n_centers = 5
+        self.x = np.array([6.0, 0.5, 0.2])
+        self.rbf_network = RBFNetwork(self.input_dim, self.n_centers)
+
+    def test_gaussian(self):
+        """Test the Gaussian function."""
+        center = np.random.rand(1, self.input_dim)
+        expected_output = np.exp(-np.linalg.norm(self.x - center) ** 2 / (2 * self.rbf_network.sigma ** 2))
+        output = self.rbf_network.gaussian(self.x, center)
+        self.assertAlmostEqual(output, expected_output, places=5)
+
+if __name__ == "__main__":
+    unittest.main()