# bigann-1b-batch-update-eval

Batch-update evaluation workload package generated from `Odeinjul/bigann-1b-static-search-eval`.

## Dataset

- Source static dataset: `Odeinjul/bigann-1b-static-search-eval`
- Vector count: `1,000,000,000`
- Dimension: `128`
- Dtype: `uint8`
- Metric: `l2`
- Initial update index: `800,000,000` vectors with external labels equal to `A = P[0:800M]`
- Update order: `update_order.u32`, a seed-`42` permutation of source IDs `[0, 1B)`

## Traces

- `insert-20`: starts from `A`, then inserts `P[800M:1B]` in twenty `10,000,000`-vector batches.
- `delete-20`: starts from the static `1B` state, then deletes `P[800M:1B]` in twenty `10,000,000`-vector batches.
- `mixed-replace-100`: keeps `800M` live vectors for 100 rounds; each round deletes a cyclic `10,000,000` source-ID slice and inserts a cyclic vector-ref slice. Insert external IDs use existing `P[800M:1B]` labels for the first `20` rounds, then new labels in `[1,000,000,000, 1,800,000,000)`.

Batch JSON files use compact descriptors (`range`, `u32_slice`, and `u32_cyclic_slice`) instead of inline million-ID arrays.

## Ground Truth

Checkpoint ground truth is produced by filtering the static source ground truth in source-distance order through the checkpoint owner map. Files are exact top-10 only when every query retains at least 10 active candidates from the static source GT depth. If a checkpoint cannot provide top-10 for every query, the package writes a matching `.invalid.json` marker instead of padding.

## Files

- `workload.json`: workload contract.
- `static-workload-reference.json`: immutable static-search-eval references.
- `source_manifest.json`: generation manifest.
- `update_order.u32`: seed-42 source-ID permutation.
- `initial/index_800m_m32_efc500`: HNSW index built from `base[A]` with labels `A`.
- `groundtruth/active_800m.bin`: initial `800M` checkpoint GT, or `active_800m.invalid.json`.
- `traces/*/trace.json`: trace metadata.
- `traces/*/batches/*.json`: compact batch descriptors.
- `traces/*/groundtruth/*`: checkpoint GT or invalid markers.
- `checksums.sha256`: checksums for generated package files.

PQ artifacts from the static dataset are referenced but not reordered into this first package version.