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88 lines
2.9 KiB
Python
88 lines
2.9 KiB
Python
#!/usr/bin/env python3
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"""Linux-isolated ANNOY measurement used when the host ARM wheel is broken."""
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import json
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import os
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import statistics
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import sys
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import tempfile
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import time
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import numpy as np
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from annoy import AnnoyIndex
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def latency_stats(values):
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return {
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"mean": statistics.mean(values),
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"p50": float(np.percentile(values, 50)),
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"p95": float(np.percentile(values, 95)),
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}
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def main():
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input_path, output_path = sys.argv[1:3]
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data = np.load(input_path, allow_pickle=False)
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ids = [str(x) for x in data["ids"]]
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vectors = data["vectors"].astype("float32")
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queries = data["queries"].astype("float32")
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initial_truth = data["initial_truth"]
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full_truth = data["full_truth"]
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initial_n, k, repeats = (int(x) for x in data["parameters"])
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dimension = vectors.shape[1]
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index = AnnoyIndex(dimension, "angular")
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started = time.perf_counter()
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for i, vector in enumerate(vectors[:initial_n]):
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index.add_item(i, vector.tolist())
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index.build(50)
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build_ms = (time.perf_counter() - started) * 1000
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recalls, latencies, rankings = [], [], []
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for q_idx, query in enumerate(queries):
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first = None
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for _ in range(repeats):
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started = time.perf_counter()
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found = index.get_nns_by_vector(query.tolist(), k, -1, False)
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latencies.append((time.perf_counter() - started) * 1000)
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if first is None:
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first = found
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recalls.append(len(set(first) & set(initial_truth[q_idx].tolist())) / k)
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rankings.append({"query_index": q_idx, "doc_ids": [ids[i] for i in first]})
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with tempfile.NamedTemporaryFile() as handle:
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index.save(handle.name)
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serialized_bytes = os.path.getsize(handle.name)
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# ANNOY cannot mutate a built index: full update means rebuilding a fresh tree.
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started = time.perf_counter()
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updated = AnnoyIndex(dimension, "angular")
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for i, vector in enumerate(vectors):
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updated.add_item(i, vector.tolist())
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updated.build(50)
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update_ms = (time.perf_counter() - started) * 1000
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update_recalls = []
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for q_idx, query in enumerate(queries):
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found = updated.get_nns_by_vector(query.tolist(), k, -1, False)
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update_recalls.append(len(set(found) & set(full_truth[q_idx].tolist())) / k)
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payload = {
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"build_ms": round(build_ms, 3),
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"recall_at_k": statistics.mean(recalls),
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"query_latency_ms": latency_stats(latencies),
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"serialized_bytes": serialized_bytes,
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"rankings": rankings,
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"incremental_update": {
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"items_added": len(ids) - initial_n,
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"latency_ms": round(update_ms, 3),
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"requires_full_rebuild": True,
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"recall_at_k_after_update": statistics.mean(update_recalls),
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},
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}
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with open(output_path, "w", encoding="utf-8") as handle:
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json.dump(payload, handle, indent=2)
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if __name__ == "__main__":
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main()
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