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test_io.py
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test_io.py
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# Copyright (c) Facebook, Inc. and its affiliates.
#
# This source code is licensed under the MIT license found in the
# LICENSE file in the root directory of this source tree.
#!/usr/bin/env python3
import numpy as np
import unittest
import faiss
import tempfile
import os
import io
import sys
import warnings
from multiprocessing.dummy import Pool as ThreadPool
from common import get_dataset, get_dataset_2
class TestIOVariants(unittest.TestCase):
def test_io_error(self):
d, n = 32, 1000
x = np.random.uniform(size=(n, d)).astype('float32')
index = faiss.IndexFlatL2(d)
index.add(x)
_, fname = tempfile.mkstemp()
try:
faiss.write_index(index, fname)
# should be fine
faiss.read_index(fname)
# now damage file
data = open(fname, 'rb').read()
data = data[:int(len(data) / 2)]
open(fname, 'wb').write(data)
# should make a nice readable exception that mentions the filename
try:
faiss.read_index(fname)
except RuntimeError as e:
if fname not in str(e):
raise
else:
raise
finally:
if os.path.exists(fname):
os.unlink(fname)
class TestCallbacks(unittest.TestCase):
def do_write_callback(self, bsz):
d, n = 32, 1000
x = np.random.uniform(size=(n, d)).astype('float32')
index = faiss.IndexFlatL2(d)
index.add(x)
f = io.BytesIO()
# test with small block size
writer = faiss.PyCallbackIOWriter(f.write, 1234)
if bsz > 0:
writer = faiss.BufferedIOWriter(writer, bsz)
faiss.write_index(index, writer)
del writer # make sure all writes committed
if sys.version_info[0] < 3:
buf = f.getvalue()
else:
buf = f.getbuffer()
index2 = faiss.deserialize_index(np.frombuffer(buf, dtype='uint8'))
self.assertEqual(index.d, index2.d)
self.assertTrue(np.all(
faiss.vector_to_array(index.xb) == faiss.vector_to_array(index2.xb)
))
# This is not a callable function: shoudl raise an exception
writer = faiss.PyCallbackIOWriter("blabla")
self.assertRaises(
Exception,
faiss.write_index, index, writer
)
def test_buf_read(self):
x = np.random.uniform(size=20)
_, fname = tempfile.mkstemp()
try:
x.tofile(fname)
f = open(fname, 'rb')
reader = faiss.PyCallbackIOReader(f.read, 1234)
bsz = 123
reader = faiss.BufferedIOReader(reader, bsz)
y = np.zeros_like(x)
print('nbytes=', y.nbytes)
reader(faiss.swig_ptr(y), y.nbytes, 1)
np.testing.assert_array_equal(x, y)
finally:
if os.path.exists(fname):
os.unlink(fname)
def do_read_callback(self, bsz):
d, n = 32, 1000
x = np.random.uniform(size=(n, d)).astype('float32')
index = faiss.IndexFlatL2(d)
index.add(x)
_, fname = tempfile.mkstemp()
try:
faiss.write_index(index, fname)
f = open(fname, 'rb')
reader = faiss.PyCallbackIOReader(f.read, 1234)
if bsz > 0:
reader = faiss.BufferedIOReader(reader, bsz)
index2 = faiss.read_index(reader)
self.assertEqual(index.d, index2.d)
np.testing.assert_array_equal(
faiss.vector_to_array(index.xb),
faiss.vector_to_array(index2.xb)
)
# This is not a callable function: should raise an exception
reader = faiss.PyCallbackIOReader("blabla")
self.assertRaises(
Exception,
faiss.read_index, reader
)
finally:
if os.path.exists(fname):
os.unlink(fname)
def test_write_callback(self):
self.do_write_callback(0)
def test_write_buffer(self):
self.do_write_callback(123)
self.do_write_callback(2345)
def test_read_callback(self):
self.do_read_callback(0)
def test_read_callback_buffered(self):
self.do_read_callback(123)
self.do_read_callback(12345)
def test_read_buffer(self):
d, n = 32, 1000
x = np.random.uniform(size=(n, d)).astype('float32')
index = faiss.IndexFlatL2(d)
index.add(x)
_, fname = tempfile.mkstemp()
try:
faiss.write_index(index, fname)
reader = faiss.BufferedIOReader(
faiss.FileIOReader(fname), 1234)
index2 = faiss.read_index(reader)
self.assertEqual(index.d, index2.d)
np.testing.assert_array_equal(
faiss.vector_to_array(index.xb),
faiss.vector_to_array(index2.xb)
)
finally:
if os.path.exists(fname):
os.unlink(fname)
def test_transfer_pipe(self):
""" transfer an index through a Unix pipe """
d, n = 32, 1000
x = np.random.uniform(size=(n, d)).astype('float32')
index = faiss.IndexFlatL2(d)
index.add(x)
Dref, Iref = index.search(x, 10)
rf, wf = os.pipe()
# start thread that will decompress the index
def index_from_pipe():
reader = faiss.PyCallbackIOReader(lambda size: os.read(rf, size))
return faiss.read_index(reader)
fut = ThreadPool(1).apply_async(index_from_pipe, ())
# write to pipe
writer = faiss.PyCallbackIOWriter(lambda b: os.write(wf, b))
faiss.write_index(index, writer)
index2 = fut.get()
# closing is not really useful but it does not hurt
os.close(wf)
os.close(rf)
Dnew, Inew = index2.search(x, 10)
np.testing.assert_array_equal(Iref, Inew)
np.testing.assert_array_equal(Dref, Dnew)