Add IVF_PQ backwards compatibility data generation and testing (#555)

apis/python/test/test_backwards_compatibility.py

@@ -2,6 +2,7 @@
 
 from tiledb.vector_search.flat_index import FlatIndex
 from tiledb.vector_search.ivf_flat_index import IVFFlatIndex
+from tiledb.vector_search.ivf_pq_index import IVFPQIndex
 from tiledb.vector_search.utils import load_fvecs
 from tiledb.vector_search.vamana_index import VamanaIndex
 
@@ -63,6 +64,8 @@ def test_query_old_indices():
                 index = FlatIndex(uri=index_uri)
             elif "vamana" in index_name:
                 index = VamanaIndex(uri=index_uri)
+            elif "ivf_pq" in index_name:
+                index = IVFPQIndex(uri=index_uri)
             else:
                 assert False, f"Unknown index name: {index_name}"
 

backwards-compatibility-data/generate_data.py

@@ -66,7 +66,7 @@ def generate_indexes(version):
     queries = base[indices]
 
     # Generate each index and query to make sure it works before we write it.
-    index_types = ["FLAT", "IVF_FLAT", "VAMANA"]
+    index_types = ["FLAT", "IVF_FLAT", "VAMANA", "IVF_PQ"]
     data_types = ["float32", "uint8"]
     for index_type in index_types:
         for data_type in data_types:
@@ -75,6 +75,7 @@ def generate_indexes(version):
                 index_type=index_type,
                 index_uri=index_uri,
                 input_vectors=base.astype(data_type),
+                num_subspaces=len(base[0]),
             )
 
             result_d, result_i = index.query(queries, k=1)

src/include/test/unit_backwards_compatibility.cc

@@ -35,9 +35,11 @@
 #include <iostream>
 #include "api/feature_vector_array.h"
 #include "api/ivf_flat_index.h"
+#include "api/ivf_pq_index.h"
 #include "api/vamana_index.h"
 #include "detail/linalg/matrix.h"
 #include "index/ivf_flat_index.h"
+#include "index/ivf_pq_index.h"
 #include "index/vamana_index.h"
 #include "mdspan/mdspan.hpp"
 #include "test/utils/array_defs.h"
@@ -135,6 +137,27 @@ TEST_CASE("test_query_old_indices", "[backwards_compatibility]") {
         // Next check that we can load the metadata.
         auto metadata = vamana_index_metadata();
         metadata.load_metadata(read_group);
+      } else if (index_uri.find("ivf_pq") != std::string::npos) {
+        // First check that we can query the index.
+        auto index = IndexIVFPQ(ctx, index_uri);
+        auto&& [scores, ids] = index.query(queries_feature_vector_array, 1, 10);
+        auto scores_span =
+            MatrixView<siftsmall_feature_type, stdx::layout_left>{
+                (siftsmall_feature_type*)scores.data(),
+                extents(scores)[0],
+                extents(scores)[1]};
+
+        auto ids_span = MatrixView<siftsmall_ids_type, stdx::layout_left>{
+            (siftsmall_ids_type*)ids.data(), extents(ids)[0], extents(ids)[1]};
+
+        for (size_t i = 0; i < query_indices.size(); ++i) {
+          CHECK(ids_span[0][i] == query_indices[i]);
+          CHECK(scores_span[0][i] == 0);
+        }
+
+        // Next check that we can load the metadata.
+        auto metadata = ivf_pq_metadata();
+        metadata.load_metadata(read_group);
       } else {
         REQUIRE(false);
       }