32 lines
611 B
Python
32 lines
611 B
Python
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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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"""
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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 ivecs_mmap(fname):
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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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d = x[:4].view('int32')[0]
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return x.reshape(-1, d + 4)[:, 4:]
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