mirror of
https://github.com/facebookresearch/faiss.git
synced 2025-06-03 21:54:02 +08:00
a8118acbc5
Changelog: - changed license: BSD+Patents -> MIT - propagates exceptions raised in sub-indexes of IndexShards and IndexReplicas - support for searching several inverted lists in parallel (parallel_mode != 0) - better support for PQ codes where nbit != 8 or 16 - IVFSpectralHash implementation: spectral hash codes inside an IVF - 6-bit per component scalar quantizer (4 and 8 bit were already supported) - combinations of inverted lists: HStackInvertedLists and VStackInvertedLists - configurable number of threads for OnDiskInvertedLists prefetching (including 0=no prefetch) - more test and demo code compatible with Python 3 (print with parentheses) - refactored benchmark code: data loading is now in a single file
46 lines
1.1 KiB
Python
46 lines
1.1 KiB
Python
# Copyright (c) Facebook, Inc. and its affiliates.
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#
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# This source code is licensed under the MIT license found in the
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# LICENSE file in the root directory of this source tree.
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from __future__ import print_function
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import sys
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import time
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import numpy as np
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def ivecs_read(fname):
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a = np.fromfile(fname, dtype='int32')
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d = a[0]
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return a.reshape(-1, d + 1)[:, 1:].copy()
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def fvecs_read(fname):
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return ivecs_read(fname).view('float32')
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def load_sift1M():
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print("Loading sift1M...", end='', file=sys.stderr)
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xt = fvecs_read("sift1M/sift_learn.fvecs")
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xb = fvecs_read("sift1M/sift_base.fvecs")
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xq = fvecs_read("sift1M/sift_query.fvecs")
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gt = ivecs_read("sift1M/sift_groundtruth.ivecs")
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print("done", file=sys.stderr)
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return xb, xq, xt, gt
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def evaluate(index, xq, gt, k):
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nq = xq.shape[0]
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t0 = time.time()
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D, I = index.search(xq, k) # noqa: E741
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t1 = time.time()
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recalls = {}
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i = 1
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while i <= k:
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recalls[i] = (I[:, :i] == gt[:, :1]).sum() / float(nq)
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i *= 10
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return (t1 - t0) * 1000.0 / nq, recalls
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