Add metadata test

Author: marekhanus

python_bindings/tests/bindings_test_metadata.py

@@ -0,0 +1,49 @@
+import unittest
+
+import numpy as np
+
+import hnswlib
+
+
+class RandomSelfTestCase(unittest.TestCase):
+    def testMetadata(self):
+
+        dim = 16
+        num_elements = 10000
+
+        # Generating sample data
+        data = np.float32(np.random.random((num_elements, dim)))
+
+        # Declaring index
+        p = hnswlib.Index(space='l2', dim=dim)  # possible options are l2, cosine or ip
+
+        # Initing index
+        # max_elements - the maximum number of elements, should be known beforehand
+        #     (probably will be made optional in the future)
+        #
+        # ef_construction - controls index search speed/build speed tradeoff
+        # M - is tightly connected with internal dimensionality of the data
+        #     stronlgy affects the memory consumption
+
+        p.init_index(max_elements=num_elements, ef_construction=100, M=16)
+
+        # Controlling the recall by setting ef:
+        # higher ef leads to better accuracy, but slower search
+        p.set_ef(100)
+
+        p.set_num_threads(4)  # by default using all available cores
+
+        print("Adding all elements (%d)" % (len(data)))
+        p.add_items(data)
+
+        # test methods
+        self.assertEqual(p.get_max_elements(), num_elements)
+        self.assertEqual(p.get_current_count(), num_elements)
+
+        # test properties
+        self.assertEqual(p.space, 'l2')
+        self.assertEqual(p.dim, dim)
+        self.assertEqual(p.M, 16)
+        self.assertEqual(p.ef_construction, 100)
+        self.assertEqual(p.max_elements, num_elements)
+        self.assertEqual(p.element_count, num_elements)