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[AZ-306] C6 FaissDescriptorIndex (faiss-cpu, HNSW32)

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Production-default DescriptorIndex strategy backed by the faiss-cpu
PyPI wheel (>=1.7,<2.0). Implements the AZ-303 Protocol surface end
to end: HNSW32 + IndexIDMap2 search, atomic three-file rebuild
(.index + .sha256 sidecar + .meta.json), triple-consistency load
check, mmap-backed reads with IO_FLAG_MMAP|IO_FLAG_READ_ONLY, optional
warm-up query at construction, FAISS RuntimeError rewrap to
IndexUnavailableError / IndexBuildError, and FaissDescriptorIndex.from_config
classmethod wired into runtime_root.storage_factory.

The original spec required a custom pybind11 wrapper over a vendored
FAISS HEAD; the user opted for the upstream faiss-cpu wheel after
research fact #92 confirmed ARM64 wheel availability for Jetson and
the existing pyproject.toml already pinned faiss-cpu. cpp/faiss_index/
placeholder removed; BUILD_FAISS_INDEX flag retained as a
runtime/factory gate (no native target). Spec rewritten end-to-end and
archived to _docs/02_tasks/done/.

C6TileCacheConfig extended with faiss_index_path and
faiss_warmup_query_path fields. tests/conftest.py sets
KMP_DUPLICATE_LIB_OK=TRUE to remediate the macOS faiss/torch libomp
duplicate-load abort during pytest (no-op on CI Linux). 21 new tests
cover AC-1..12 + 2 NFRs + from_config smoke; AZ-303 protocol-conformance
fake updated with from_config classmethod.

Tests: 124/124 c6_tile_cache pass; 1334 project-wide pass; 1
pre-existing OKVIS2 submodule failure unrelated.

Doc sync: module-layout.md, components/08_c6_tile_cache/description.md
§5, batch_35_cycle1_report.md.

Co-authored-by: Cursor <cursoragent@cursor.com>
This commit is contained in:
Oleksandr Bezdieniezhnykh
2026-05-13 04:01:37 +03:00
parent ecf76d762d
commit 3b7265757b
17 changed files with 1550 additions and 87 deletions
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tests/conftest.py
+11
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@@ -9,6 +9,17 @@ Tier-2-only tests are guarded by `pytest.mark.tier2` and auto-skipped on Tier-1.
from __future__ import annotations
# AZ-306: faiss-cpu and torch each ship their own copy of libomp on macOS;
# loading both into the same process triggers `OMP: Error #15` and an abort
# inside FAISS native code. Setting `KMP_DUPLICATE_LIB_OK` here — BEFORE
# any test module imports either library — opts into the documented
# Intel OpenMP "duplicate-load tolerated" mode, which is the standard
# remediation for mixed-runtime scientific stacks on macOS dev hosts.
# CI Linux images don't need this; the setdefault keeps it a no-op there.
import os as _os
_os.environ.setdefault("KMP_DUPLICATE_LIB_OK", "TRUE")
import os
from collections.abc import Iterator