mirror of
https://github.com/facebookresearch/faiss.git
synced 2025-06-03 21:54:02 +08:00
70eaa9b1a3
Summary: Pull Request resolved: https://github.com/facebookresearch/faiss/pull/1460 Reviewed By: wickedfoo Differential Revision: D24278804 Pulled By: beauby fbshipit-source-id: 5ea96ceb63be76a34f1eb4da03972159342cd5b6
37 lines
789 B
Python
37 lines
789 B
Python
# 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.
|
|
|
|
import numpy as np
|
|
|
|
"""
|
|
I/O functions in fvecs, bvecs, ivecs formats
|
|
"""
|
|
|
|
|
|
def ivecs_read(fname):
|
|
a = np.fromfile(fname, dtype='int32')
|
|
d = a[0]
|
|
return a.reshape(-1, d + 1)[:, 1:].copy()
|
|
|
|
|
|
def fvecs_read(fname):
|
|
return ivecs_read(fname).view('float32')
|
|
|
|
|
|
def ivecs_mmap(fname):
|
|
a = np.memmap(fname, dtype='int32', mode='r')
|
|
d = a[0]
|
|
return a.reshape(-1, d + 1)[:, 1:]
|
|
|
|
|
|
def fvecs_mmap(fname):
|
|
return ivecs_mmap(fname).view('float32')
|
|
|
|
|
|
def bvecs_mmap(fname):
|
|
x = np.memmap(fname, dtype='uint8', mode='r')
|
|
d = x[:4].view('int32')[0]
|
|
return x.reshape(-1, d + 4)[:, 4:]
|