/usr/lib/python3/dist-packages/photutils/utils/check_random_state.py is in python3-photutils 0.4-1.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 | # Licensed under a 3-clause BSD style license - see LICENSE.rst
from __future__ import (absolute_import, division, print_function,
unicode_literals)
import numbers
import numpy as np
__all__ = ['check_random_state']
def check_random_state(seed):
"""
Turn seed into a `numpy.random.RandomState` instance.
Parameters
----------
seed : `None`, int, or `numpy.random.RandomState`
If ``seed`` is `None`, return the `~numpy.random.RandomState`
singleton used by ``numpy.random``. If ``seed`` is an `int`,
return a new `~numpy.random.RandomState` instance seeded with
``seed``. If ``seed`` is already a `~numpy.random.RandomState`,
return it. Otherwise raise ``ValueError``.
Returns
-------
random_state : `numpy.random.RandomState`
RandomState object.
Notes
-----
This routine is from scikit-learn. See
http://scikit-learn.org/stable/developers/utilities.html#validation-tools.
"""
if seed is None or seed is np.random:
return np.random.mtrand._rand
if isinstance(seed, (numbers.Integral, np.integer)):
return np.random.RandomState(seed)
if isinstance(seed, np.random.RandomState):
return seed
raise ValueError('{0!r} cannot be used to seed a numpy.random.RandomState'
' instance'.format(seed))
|