54 lines
1.3 KiB
Python
54 lines
1.3 KiB
Python
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# Copyright (c) 2015-present, Facebook, Inc.
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# All rights reserved.
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#
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# This source code is licensed under the CC-by-NC license found in the
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# LICENSE file in the root directory of this source tree.
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#! /usr/bin/env python2
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"""this is a basic test script that works with fbmake to check if
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some simple indices work"""
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import libfb.py.mkl # noqa
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import numpy as np
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import pdb
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from libfb import testutil
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import faiss
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class EvalIVFPQAccuracy(testutil.BaseFacebookTestCase):
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def get_dataset(self):
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d = 64
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nb = 1000
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nt = 1500
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nq = 200
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np.random.seed(123)
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xb = np.random.random(size=(nb, d)).astype('float32')
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xt = np.random.random(size=(nt, d)).astype('float32')
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xq = np.random.random(size=(nq, d)).astype('float32')
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return (xt, xb, xq)
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def test_IndexIVFPQ(self):
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(xt, xb, xq) = self.get_dataset()
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d = xt.shape[1]
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gt_index = faiss.IndexFlatL2(d)
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gt_index.add(xb)
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D, gt_nns = gt_index.search(xq, 1)
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coarse_quantizer = faiss.IndexFlatL2(d)
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index = faiss.IndexIVFPQ(coarse_quantizer, d, 25, 16, 8)
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index.train(xt)
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index.add(xb)
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index.nprobe = 5
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D, nns = index.search(xq, 10)
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n_ok = (nns == gt_nns).sum()
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nq = xq.shape[0]
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self.assertGreater(n_ok, nq * 0.4)
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