/usr/lib/python2.7/dist-packages/numpy/dual.py is in python-numpy 1:1.13.3-2ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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Aliases for functions which may be accelerated by Scipy.
Scipy_ can be built to use accelerated or otherwise improved libraries
for FFTs, linear algebra, and special functions. This module allows
developers to transparently support these accelerated functions when
scipy is available but still support users who have only installed
NumPy.
.. _Scipy : http://www.scipy.org
"""
from __future__ import division, absolute_import, print_function
# This module should be used for functions both in numpy and scipy if
# you want to use the numpy version if available but the scipy version
# otherwise.
# Usage --- from numpy.dual import fft, inv
__all__ = ['fft', 'ifft', 'fftn', 'ifftn', 'fft2', 'ifft2',
'norm', 'inv', 'svd', 'solve', 'det', 'eig', 'eigvals',
'eigh', 'eigvalsh', 'lstsq', 'pinv', 'cholesky', 'i0']
import numpy.linalg as linpkg
import numpy.fft as fftpkg
from numpy.lib import i0
import sys
fft = fftpkg.fft
ifft = fftpkg.ifft
fftn = fftpkg.fftn
ifftn = fftpkg.ifftn
fft2 = fftpkg.fft2
ifft2 = fftpkg.ifft2
norm = linpkg.norm
inv = linpkg.inv
svd = linpkg.svd
solve = linpkg.solve
det = linpkg.det
eig = linpkg.eig
eigvals = linpkg.eigvals
eigh = linpkg.eigh
eigvalsh = linpkg.eigvalsh
lstsq = linpkg.lstsq
pinv = linpkg.pinv
cholesky = linpkg.cholesky
_restore_dict = {}
def register_func(name, func):
if name not in __all__:
raise ValueError("%s not a dual function." % name)
f = sys._getframe(0).f_globals
_restore_dict[name] = f[name]
f[name] = func
def restore_func(name):
if name not in __all__:
raise ValueError("%s not a dual function." % name)
try:
val = _restore_dict[name]
except KeyError:
return
else:
sys._getframe(0).f_globals[name] = val
def restore_all():
for name in _restore_dict.keys():
restore_func(name)
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