61 lines
1.3 KiB
Python
61 lines
1.3 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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import sys
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import numpy as np
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"""
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I/O functions in fvecs, bvecs, ivecs formats
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definition of the formats here: http://corpus-texmex.irisa.fr/
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"""
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def ivecs_read(fname):
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a = np.fromfile(fname, dtype='int32')
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if sys.byteorder == 'big':
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a.byteswap(inplace=True)
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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 ivecs_mmap(fname):
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assert sys.byteorder != 'big'
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a = np.memmap(fname, dtype='int32', mode='r')
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d = a[0]
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return a.reshape(-1, d + 1)[:, 1:]
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def fvecs_mmap(fname):
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return ivecs_mmap(fname).view('float32')
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def bvecs_mmap(fname):
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x = np.memmap(fname, dtype='uint8', mode='r')
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if sys.byteorder == 'big':
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da = x[:4][::-1].copy()
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d = da.view('int32')[0]
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else:
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d = x[:4].view('int32')[0]
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return x.reshape(-1, d + 4)[:, 4:]
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def ivecs_write(fname, m):
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n, d = m.shape
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m1 = np.empty((n, d + 1), dtype='int32')
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m1[:, 0] = d
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m1[:, 1:] = m
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if sys.byteorder == 'big':
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m1.byteswap(inplace=True)
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m1.tofile(fname)
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def fvecs_write(fname, m):
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m = m.astype('float32')
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ivecs_write(fname, m.view('int32'))
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