test: add historical index persistence compatibility coverage

AGENTS.md

@@ -170,6 +170,9 @@ validated sizes before allocation, checked reads, and a compatibility fixture or
 path. Review each affected index format; preserve SymphonyQG's versioned quantized format and legacy
 raw fallback unless a breaking change is authorized.
 
+Frozen release-produced indexes and reference searches live in `tests/fixtures/persistence/`;
+keep their provenance and hashes, and do not regenerate them with the current writer.
+
 Use `python_bindings/bindings_common.hpp` for shared conversions. Validate array rank, dimensions,
 index state, and parameter ranges before entering the core. `py::array::forcecast` permits copies;
 do not use it where callers expect in-place mutation or pointer identity.

docs/docs/quick_start.md

@@ -187,6 +187,16 @@ before starting the program.
 Index save/load paths are UTF-8 strings on Windows and native path bytes on POSIX
 in C++; Python paths are Unicode strings on all platforms.
 
+### Index file compatibility
+
+The compatibility suite loads frozen files written by v0.5.2, compares search
+IDs and distances, and verifies save/load migration and rejection of truncated
+or unsupported versions. See the
+[fixture provenance and coverage](https://github.com/VectorDB-NTU/RaBitQ-Library/tree/main/tests/fixtures/persistence).
+Compatibility is format-specific; preserving old readers' ability to open new
+files is not guaranteed. Consult each index's format documentation before
+downgrading the library.
+
 ### Build the Python bindings from source
 
 Source builds require Python 3.11 or newer, a C++17 compiler, CMake 3.20 or

tests/CMakeLists.txt

@@ -27,6 +27,9 @@ add_executable(rabitq_tests
     ${INTEG_TESTS}
 )
 target_include_directories(rabitq_tests PRIVATE ${CMAKE_CURRENT_SOURCE_DIR}/common)
+set_source_files_properties(unit/rabitqlib/index/historical_persistence_test.cpp
+    PROPERTIES COMPILE_DEFINITIONS
+    "RABITQ_TEST_FIXTURE_DIR=\"${CMAKE_CURRENT_SOURCE_DIR}/fixtures/persistence/v0.5.2\"")
 rabitq_configure_target(rabitq_tests)
 
 # Link google test and rabitqlib headers

tests/README.md

@@ -3,6 +3,11 @@
 This directory contains the C++ unit and integration tests and the Python
 binding tests for RaBitQ Library.
 
+Persistence tests include [frozen release-produced indexes](fixtures/persistence/README.md)
+and search results, in addition to current round trips. C++ and installed-wheel
+tests load the same fixtures, compare search results, and verify save/load migration
+and rejection of truncated or unsupported formats.
+
 ## Prerequisites
 
 - CMake 3.20 or newer for the `ctest --test-dir` commands below (4.2 or newer

tests/fixtures/persistence/.gitattributes

@@ -0,0 +1,3 @@
+*.index -text
+*.expected text eol=lf
+manifest.json text eol=lf

tests/fixtures/persistence/CMakeLists.txt

@@ -0,0 +1,13 @@
+cmake_minimum_required(VERSION 3.20)
+project(rabitq_historical_fixtures LANGUAGES CXX)
+
+if(NOT IS_DIRECTORY "${RABITQ_HISTORICAL_SOURCE}")
+    message(FATAL_ERROR "Set RABITQ_HISTORICAL_SOURCE to the pinned historical checkout")
+endif()
+set(RABITQ_BUILD_TESTS OFF CACHE BOOL "" FORCE)
+set(RABITQ_BUILD_SAMPLES OFF CACHE BOOL "" FORCE)
+set(RABITQ_BUILD_PYTHON_BINDINGS OFF CACHE BOOL "" FORCE)
+set(RABITQ_ENABLE_NATIVE_OPTIMIZATION OFF CACHE BOOL "" FORCE)
+add_subdirectory("${RABITQ_HISTORICAL_SOURCE}" historical)
+add_executable(generate_fixtures generate.cpp)
+target_link_libraries(generate_fixtures PRIVATE rabitqlib::rabitqlib)

tests/fixtures/persistence/README.md

@@ -0,0 +1,55 @@
+# Historical persistence fixtures
+
+These files were written by release **v0.5.2**, commit
+`d929e30dbb7ded52db1830736a2356fbc7dba99a`, using [generate.cpp](generate.cpp).
+Tests load committed bytes; they do not generate indexes with the current writer.
+[manifest.json](manifest.json) records the producer and SHA-256 hashes of every
+index and its reference search results. Keep existing fixtures unchanged when
+adding a new format or release.
+
+The twelve cases cover L2 and inner product for:
+
+- IVF four-bit legacy files without a header, and raw-vector IVF v1 files;
+- HNSW four-bit files, including persisted removal of point 0;
+- SymphonyQG legacy raw files and versioned four/eight-bit files.
+
+IVF also persists removal of point 0. Each file contains 33 points in 65 original
+dimensions and the historical **128-dimensional padded domain**. This differs
+from current construction's 96 dimensions and detects accidental regeneration
+of rotation or padding on load. The `.expected` files hold the point count,
+dimension, query count, k, original queries, and ordered ID/distance pairs from
+the historical implementation.
+
+Tests require identical result IDs and allow distance error of
+`2e-4 * max(1, abs(reference))` in C++, or `rtol=atol=2e-4` in Python, to account
+for compiler and SIMD reductions. The native formats contain `size_t`: these
+fixtures target the supported little-endian, 64-bit platforms, not a portable
+interchange format for arbitrary architectures. Python also tests synthetic IVF
+v1 headers around the frozen historical payload, unknown versions, and invalid
+padding. That header test is distinct from release-produced fixtures.
+
+The small IVF fixtures use Flat centroid routing. Current round-trip and failure
+tests exercise explicit HNSW routing and its sidecar; historical auto-selected
+HNSW routing at 20,000 clusters is not represented by these small fixtures.
+
+## Deliberate regeneration
+
+Use an isolated copy of the pinned release. Do not point this build at the
+current source tree. For example, from the repository root:
+
+```bash
+mkdir -p build/fixtures/v0.5.2
+git archive v0.5.2 | tar -x -C build/fixtures/v0.5.2
+cmake -S tests/fixtures/persistence -B build/fixtures/generator \
+  -DRABITQ_HISTORICAL_SOURCE="$PWD/build/fixtures/v0.5.2" \
+  -DCMAKE_BUILD_TYPE=Release
+cmake --build build/fixtures/generator --config Release --parallel 2
+```
+
+Run the resulting `generate_fixtures` executable with a **new output directory**.
+On Windows it is under `build/fixtures/generator/Release/`. Review the new
+artifacts and record their hashes and compiler/ISA in a separate manifest before
+adopting them. Some historical constructors seed rotation from `random_device`,
+so rebuilding does not promise byte-identical files; each committed index and its
+reference results form a fixed pair. `.gitattributes` prevents newline conversion
+from changing fixture hashes on Windows.

tests/fixtures/persistence/generate.cpp

@@ -0,0 +1,96 @@
+// Build only against the pinned historical source, never the current checkout.
+#include <cstddef>
+#include <cstdint>
+#include <filesystem>
+#include <fstream>
+#include <iomanip>
+#include <limits>
+#include <stdexcept>
+#include <string>
+#include <vector>
+
+#include "rabitqlib/index/hnsw/hnsw.hpp"
+#include "rabitqlib/index/ivf/ivf.hpp"
+#include "rabitqlib/index/symqg/qg.hpp"
+#include "rabitqlib/index/symqg/qg_builder.hpp"
+
+int main(int argc, char** argv) {
+    if (argc != 2) {
+        throw std::invalid_argument("Pass the fixture output directory");
+    }
+    using namespace rabitqlib;
+    constexpr size_t kCount = 33, kDim = 65, kQueries = 3, kTopK = 5;
+    const std::filesystem::path directory(argv[1]);
+    std::filesystem::create_directories(directory);
+    uint32_t state = 713;
+    const auto next = [&state] {
+        state = state * 1664525U + 1013904223U;
+        return static_cast<float>(static_cast<int>((state >> 8) % 2001) - 1000) / 256.0F;
+    };
+    std::vector<float> data(kCount * kDim), queries(kQueries * kDim), centroid(kDim);
+    for (auto& value : data)
+        value = next();
+    for (auto& value : queries)
+        value = next();
+    for (size_t i = 0; i < kCount; ++i) {
+        for (size_t d = 0; d < kDim; ++d)
+            centroid[d] += data[i * kDim + d] / kCount;
+    }
+    std::vector<PID> clusters(kCount, 0);
+    for (auto metric : {METRIC_L2, METRIC_IP}) {
+        for (const std::string kind : {"ivf4", "ivf32", "hnsw4", "qg0", "qg4", "qg8"}) {
+            const std::string name = kind + (metric == METRIC_L2 ? "_l2" : "_ip");
+            const auto path = (directory / (name + ".index")).string();
+            std::vector<PID> ids(kQueries * kTopK);
+            std::vector<float> distances(ids.size());
+            if (kind.substr(0, 3) == "ivf") {
+                ivf::IVF index(kCount, kDim, 1, kind == "ivf32" ? 32 : 4, metric);
+                index.construct(data.data(), centroid.data(), clusters.data(), false, 1);
+                const PID removed = 0;
+                index.remove(&removed, 1);
+                index.save(path.c_str());
+                index.search_batch(
+                    queries.data(), kQueries, kTopK, 1, ids.data(), distances.data()
+                );
+            } else if (kind == "hnsw4") {
+                hnsw::HierarchicalNSW index(kCount, kDim, 4, 8, 64, 42, metric);
+                index.construct(
+                    1, centroid.data(), kCount, data.data(), clusters.data(), 1
+                );
+                const PID removed = 0;
+                index.remove(&removed, 1);
+                index.save(path.c_str());
+                const auto result = index.search(queries.data(), kQueries, kTopK, 64, 1);
+                for (size_t i = 0; i < kQueries; ++i) {
+                    for (size_t j = 0; j < kTopK; ++j) {
+                        ids[i * kTopK + j] = result[i][j].second;
+                        distances[i * kTopK + j] = result[i][j].first;
+                    }
+                }
+            } else {
+                const size_t bits = kind == "qg0" ? 0 : (kind == "qg4" ? 4 : 8);
+                symqg::QuantizedGraph<float> index(
+                    kCount, kDim, 32, metric, RotatorType::FhtKacRotator, bits, 42
+                );
+                symqg::QGBuilder builder(
+                    index, 64, data.data(), 1, symqg::QGInitialization::PiPNN, 42
+                );
+                builder.build();
+                index.save(path.c_str());
+                index.set_ef(64);
+                index.search_batch(
+                    queries.data(), kQueries, kTopK, ids.data(), distances.data(), 1
+                );
+            }
+            std::ofstream expected(directory / (name + ".expected"), std::ios::binary);
+            expected.exceptions(std::ios::failbit | std::ios::badbit);
+            expected << std::setprecision(std::numeric_limits<float>::max_digits10);
+            expected << kCount << ' ' << kDim << ' ' << kQueries << ' ' << kTopK << '\n';
+            for (size_t i = 0; i < queries.size(); ++i)
+                expected << queries[i] << (i + 1 == queries.size() ? '\n' : ' ');
+            for (size_t i = 0; i < ids.size(); ++i)
+                expected << ids[i] << ' ' << distances[i] << '\n';
+            expected.close();
+        }
+    }
+}

tests/fixtures/persistence/manifest.json

@@ -0,0 +1,34 @@
+{
+  "source_tag": "v0.5.2",
+  "source_commit": "d929e30dbb7ded52db1830736a2356fbc7dba99a",
+  "writer": "generate.cpp",
+  "producer": "Windows x86-64, MSVC 19.51.36257, AVX2, one thread, native optimization OFF",
+  "byte_order": "little",
+  "size_t_bytes": 8,
+  "sha256": {
+    "v0.5.2/hnsw4_ip.expected": "b4cace8e528f3934167b3a3724d0d5a4a1f6b9aca26317b7f6eed3ae522e4497",
+    "v0.5.2/hnsw4_ip.index": "6015e29fed514ba7c6b90ccd538218a1719cdfac5c548da837e85af1012818ba",
+    "v0.5.2/hnsw4_l2.expected": "632a19638aa7f7c716e3310f21b28773d5956d708295ff821ff861084a67020d",
+    "v0.5.2/hnsw4_l2.index": "8161c900b3b85ba00b6aa89a9c24740fce94541bdee0e7b1dbe23073156cad88",
+    "v0.5.2/ivf32_ip.expected": "e0d953927d08b619c75b9424a032f136d32d3756d3fde4bf8c6abe0b7b743a28",
+    "v0.5.2/ivf32_ip.index": "f98eabdaf408569ffeb4480b4c5f12d8a2b893f970646f9c26a7773ff453b93d",
+    "v0.5.2/ivf32_l2.expected": "a9ba0430f4c8a517168aa1ff75bad72d7f6089161561412a75976fc970400f9c",
+    "v0.5.2/ivf32_l2.index": "c395ace9210c79ea55fa7f842920413cf9848aba02b6c0f3cbee30538a20c4c2",
+    "v0.5.2/ivf4_ip.expected": "6cc51bd995a4d6dad7f1467074de13d1d8d129895c90e67bf3ade771b6ad741d",
+    "v0.5.2/ivf4_ip.index": "34135508210fa39db36b7ccef7f04b029d5d9185d35be702982682d83137ab8a",
+    "v0.5.2/ivf4_l2.expected": "e7881505994bbb518c75d466dffcba2a5fa4dc81d3782fa6417d0c3ccc965e26",
+    "v0.5.2/ivf4_l2.index": "477c0f37502efc0a7a99587eb3bc0abe24b8b11d465b35aed87a60eb7a48b0c2",
+    "v0.5.2/qg0_ip.expected": "f7b9c5d1884c21b7cef507b43ee13c69fc1e5037168d1e432a12aa1e6ccedddb",
+    "v0.5.2/qg0_ip.index": "3f22cbc4a7daa3fdf9024fa8afb38de8ea26216bb5ebb6d4d3d92d15b83b08cf",
+    "v0.5.2/qg0_l2.expected": "ddfe995d8c67d4bd7123dbe8b8eef60b713899d5c58b0bfada112b4c965c9319",
+    "v0.5.2/qg0_l2.index": "50b28977edb17048744dd6c2039963bb550ecc471076d0c98c1bcb47f8d08ea8",
+    "v0.5.2/qg4_ip.expected": "ea91f5dd31b7c395998b16d72e645708d5d1b523d5a9f68e8c1b760679ee4cd4",
+    "v0.5.2/qg4_ip.index": "8039c3b58d927cc281bc2e9785b4efc2bb9a046bb06189d8e3040fe87d032227",
+    "v0.5.2/qg4_l2.expected": "6913d262200c128d20940bb2223354d45b51749d137e6344588091aa039e5495",
+    "v0.5.2/qg4_l2.index": "77554486d9b0de7beb414d1a4d6201dc0c13d1f1c8afda662bdbc732113b63f0",
+    "v0.5.2/qg8_ip.expected": "4151968625f09edba7dd0061acef59368094890ab3975a551ffe723b4133193a",
+    "v0.5.2/qg8_ip.index": "542a8e86cc686349406896c3838d889ee7873f6edc7de1c09b5806176846a5f6",
+    "v0.5.2/qg8_l2.expected": "7385b1a5396c84e994821a0a512ff039337852c9a4e0d2075c1cbbe3246cef2a",
+    "v0.5.2/qg8_l2.index": "be5ea3d4fd3d61059d7ec985a79eaadbc3d3e7f744042707a7df0d846e2d1efb"
+  }
+}

tests/fixtures/persistence/v0.5.2/hnsw4_ip.expected

@@ -0,0 +1,17 @@
+33 65 3 5
+-1.2578125 -3.078125 -3.328125 0.67578125 3.171875 -0.2578125 -2.796875 0.91015625 -3.859375 0.328125 2.296875 -2.0859375 -0.66015625 -3.3046875 2.19140625 2.1484375 2.328125 3.7890625 3.3515625 0.08203125 1.41796875 1.43359375 -1.1484375 1.4375 2.55078125 2.0703125 -1.5859375 -2.8046875 -2.2890625 1.73828125 -2.41796875 -3.09765625 1.53515625 -3.6953125 -0.66796875 0.67578125 0.96484375 -2.9296875 2.41796875 1.25390625 -1.8984375 3.14453125 2.359375 0.65625 -2.52734375 -0.17578125 -0.80859375 -2.171875 -1.63671875 -0.421875 -3.08203125 -0.1328125 -1.94140625 2.734375 2.1875 -2.1015625 3.828125 3.82421875 -3.61328125 -0.9921875 -3.27734375 2.9765625 2.29296875 0.7421875 3.48828125 -2.58203125 1.0234375 -3.12109375 1.83203125 -2.29296875 1.05859375 2.15234375 -2.5390625 -2.3125 -2.7265625 -3.33203125 1.671875 3.6796875 3.53515625 -1.75 0.6328125 -3.1171875 -2.6875 -0.3671875 -2.640625 -2.52734375 -0.65625 1.89453125 -1.08984375 0.25390625 -3.65234375 1.08203125 -0.55078125 3.6171875 2.80078125 2.265625 2.80078125 0.98828125 -1.03515625 1.0234375 -0.04296875 2.95703125 1.8125 -1.6796875 2.75390625 -3.70703125 1.60546875 0.27734375 -3.2265625 -2.57421875 -0.875 1.40234375 -3.55078125 2.80859375 2.953125 3.37109375 -0.02734375 3.16796875 3.23828125 -0.21875 0.57421875 -2.82421875 3.80078125 1.66796875 -3.30859375 -1.21875 1.05078125 1.0546875 2.2890625 3.84765625 1.58984375 -0.7734375 -0.48046875 1.28125 -1.30859375 -1.27734375 2.67578125 1.19921875 2.3515625 -0.140625 -3.828125 -3.84375 1.0703125 -2.27734375 -2.05859375 3.59375 1.3359375 -3.44140625 -0.40234375 -0.26953125 1.671875 -3.24609375 -3.42578125 0.76953125 -0.67578125 -1.53125 -3.2578125 3.65234375 -2.9921875 3.4609375 0.25390625 1.5390625 -0.78125 2.109375 0.99609375 1.5078125 -0.33203125 -1.4296875 -0.01953125 -0.625 2.609375 0.796875 -1.1875 1.125 3.62890625 -3.23046875 -2.91015625 3.0859375 2.23828125 -3.6015625 -1.38671875 3.0703125 -2.2890625 -3.375 3.0390625 -2.02734375 -0.9140625 1 -0.0546875 0.66796875 -3.52734375 -2.8046875 0.93359375 -3.21875 -2.05859375
+17 -107.63942
+30 -97.97155
+26 -96.9916306
+9 -67.9665985
+12 -56.8626518
+10 -88.5409393
+4 -52.2220459
+24 -42.5000038
+29 -40.7176285
+23 -28.9736595
+8 -71.0609741
+31 -47.7379608
+14 -38.9586029
+26 -37.554657
+19 -36.1280594

tests/fixtures/persistence/v0.5.2/hnsw4_l2.expected

@@ -0,0 +1,17 @@
+33 65 3 5
+-1.2578125 -3.078125 -3.328125 0.67578125 3.171875 -0.2578125 -2.796875 0.91015625 -3.859375 0.328125 2.296875 -2.0859375 -0.66015625 -3.3046875 2.19140625 2.1484375 2.328125 3.7890625 3.3515625 0.08203125 1.41796875 1.43359375 -1.1484375 1.4375 2.55078125 2.0703125 -1.5859375 -2.8046875 -2.2890625 1.73828125 -2.41796875 -3.09765625 1.53515625 -3.6953125 -0.66796875 0.67578125 0.96484375 -2.9296875 2.41796875 1.25390625 -1.8984375 3.14453125 2.359375 0.65625 -2.52734375 -0.17578125 -0.80859375 -2.171875 -1.63671875 -0.421875 -3.08203125 -0.1328125 -1.94140625 2.734375 2.1875 -2.1015625 3.828125 3.82421875 -3.61328125 -0.9921875 -3.27734375 2.9765625 2.29296875 0.7421875 3.48828125 -2.58203125 1.0234375 -3.12109375 1.83203125 -2.29296875 1.05859375 2.15234375 -2.5390625 -2.3125 -2.7265625 -3.33203125 1.671875 3.6796875 3.53515625 -1.75 0.6328125 -3.1171875 -2.6875 -0.3671875 -2.640625 -2.52734375 -0.65625 1.89453125 -1.08984375 0.25390625 -3.65234375 1.08203125 -0.55078125 3.6171875 2.80078125 2.265625 2.80078125 0.98828125 -1.03515625 1.0234375 -0.04296875 2.95703125 1.8125 -1.6796875 2.75390625 -3.70703125 1.60546875 0.27734375 -3.2265625 -2.57421875 -0.875 1.40234375 -3.55078125 2.80859375 2.953125 3.37109375 -0.02734375 3.16796875 3.23828125 -0.21875 0.57421875 -2.82421875 3.80078125 1.66796875 -3.30859375 -1.21875 1.05078125 1.0546875 2.2890625 3.84765625 1.58984375 -0.7734375 -0.48046875 1.28125 -1.30859375 -1.27734375 2.67578125 1.19921875 2.3515625 -0.140625 -3.828125 -3.84375 1.0703125 -2.27734375 -2.05859375 3.59375 1.3359375 -3.44140625 -0.40234375 -0.26953125 1.671875 -3.24609375 -3.42578125 0.76953125 -0.67578125 -1.53125 -3.2578125 3.65234375 -2.9921875 3.4609375 0.25390625 1.5390625 -0.78125 2.109375 0.99609375 1.5078125 -0.33203125 -1.4296875 -0.01953125 -0.625 2.609375 0.796875 -1.1875 1.125 3.62890625 -3.23046875 -2.91015625 3.0859375 2.23828125 -3.6015625 -1.38671875 3.0703125 -2.2890625 -3.375 3.0390625 -2.02734375 -0.9140625 1 -0.0546875 0.66796875 -3.52734375 -2.8046875 0.93359375 -3.21875 -2.05859375
+26 453.392426
+17 463.42041
+30 493.784241
+31 524.302551
+9 537.602112
+10 489.697937
+4 576.82843
+24 614.970398
+25 631.867432
+29 639.606873
+31 504.269501
+8 524.510742
+26 542.575867
+25 569.645813
+14 586.446594

tests/fixtures/persistence/v0.5.2/ivf32_ip.expected

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