#342 first try at adding specified layer loading

python_bindings/bindings.cpp

@@ -288,6 +288,10 @@ class Index {
         return ids;
     }
 
+    py::list getFirstLayer(int layer) {
+        return appr_alg->get_linklist_at_level(appr_alg->entry, layer);
+    }
+
 
     py::dict getAnnData() const { /* WARNING: Index::getAnnData is not thread-safe with Index::addItems */
 

python_bindings/tests/bindings_test_getdata.py

@@ -44,3 +44,46 @@ def testGettingItems(self):
         # After adding them, all labels should be retrievable
         returned_items = p.get_items(labels)
         self.assertSequenceEqual(data.tolist(), returned_items)
+
+
+    def testGettingItems(self):
+            print("\n**** Getting the data by layer ****\n")
+
+            dim = 16
+            num_elements = 10000
+
+            # Generating sample data
+            data = np.float32(np.random.random((num_elements, dim)))
+            labels = np.arange(0, num_elements)
+
+            # Declaring index
+            p = hnswlib.Index(space='l2', dim=dim)  # possible options are l2, cosine or ip
+
+            # Initiating 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
+            #     strongly 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
+
+            # Before adding anything, getting any labels should fail
+            self.assertRaises(Exception, lambda: p.get_items(labels))
+
+            print("Adding all elements (%d)" % (len(data)))
+            p.add_items(data, labels)
+
+            # After adding them, all labels should be retrievable
+            returned_items = p.get_items(labels)
+            self.assertSequenceEqual(data.tolist(), returned_items)
+
+            data = p.getFirstLayer(layer=0)
+            print(data)

sift_1b.cpp

@@ -231,22 +231,22 @@ inline bool exists_test(const std::string &name) {
 void sift_test1B() {
 
 
-	int subset_size_milllions = 200;
+	int subset_size_millions = 200;
 	int efConstruction = 40;
 	int M = 16;
 
 
-    size_t vecsize = subset_size_milllions * 1000000;
+    size_t vecsize = subset_size_millions * 1000000;
 
     size_t qsize = 10000;
     size_t vecdim = 128;
     char path_index[1024];
     char path_gt[1024];
     char *path_q = "../bigann/bigann_query.bvecs";
     char *path_data = "../bigann/bigann_base.bvecs";
-    sprintf(path_index, "sift1b_%dm_ef_%d_M_%d.bin", subset_size_milllions, efConstruction, M);
+    sprintf(path_index, "sift1b_%dm_ef_%d_M_%d.bin", subset_size_millions, efConstruction, M);
 
-    sprintf(path_gt, "../bigann/gnd/idx_%dM.ivecs", subset_size_milllions);
+    sprintf(path_gt, "../bigann/gnd/idx_%dM.ivecs", subset_size_millions);
 
 
     unsigned char *massb = new unsigned char[vecdim];