annoy

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# Copyright (c) 2013 Spotify AB
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may not
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# use this file except in compliance with the License. You may obtain a copy of
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# the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations under
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# the License.
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import multiprocessing.pool
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import numpy
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from annoy import AnnoyIndex
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def test_threads():
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    n, f = 10000, 10
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    i = AnnoyIndex(f, "euclidean")
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    for j in range(n):
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        i.add_item(j, numpy.random.normal(size=f))
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    i.build(10)
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    pool = multiprocessing.pool.ThreadPool()
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    def query_f(j):
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        i.get_nns_by_item(1, 1000)
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    pool.map(query_f, range(n))
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