[Numpy-discussion] printable random seed ?

josef.pktd@gmai... josef.pktd@gmai...
Wed Sep 22 10:48:54 CDT 2010


On Wed, Sep 22, 2010 at 10:34 AM, Robert Kern <robert.kern@gmail.com> wrote:
> On Wed, Sep 22, 2010 at 09:27,  <josef.pktd@gmail.com> wrote:
>> I would like to generate random numbers based on a random seed, for
>> example what numpy.random does if the seed is not specified. But I
>> would also like to print out the initial state, so I can replicate the
>> random numbers.
>>
>> Can I get a human readable or printable version of the initial state?
>
> [~]
> |13> prng = np.random.RandomState()
>
> [~]
> |14> prng2 = np.random.RandomState()
>
> [~]
> |15> prng.randint(100, size=10)
> array([74, 62, 56, 94, 86, 59, 69, 94, 42, 18])
>
> [~]
> |16> prng2.randint(100, size=10)
> array([21, 58, 34, 55,  9, 81, 45,  3, 93, 62])
>
> [~]
> |17> prng2.set_state(prng.get_state())
>
> [~]
> |18> prng.randint(100, size=10)
> array([37, 57,  2,  0, 68,  9, 75, 88, 11,  7])
>
> [~]
> |19> prng2.randint(100, size=10)
> array([37, 57,  2,  0, 68,  9, 75, 88, 11,  7])
>
> [~]
> |20> prng.get_state()
>
> ('MT19937',
>  array([1368120112,  957462593, 2623310617, 4207155283,  446940397,
>       3506388262, 4104366519,  371500243, 4029407620,  899392379,
> ....
>       1843090101, 2484333397, 4085469971,  306955884,   23307203,
>       1640066622,   48186677,  637144011,  854838500], dtype=uint32),
>  26,
>  0,
>  2.5933437794758841e-288)
>
>> Alternatively, what's a good way to  randomly generate an initial
>> state?
>
> np.random.RandomState() will do the best thing on each platform.

Thanks, I need to think about whether I want to save the full
get_state() tuple (or cheat)

Josef

>
> --
> Robert Kern
>
> "I have come to believe that the whole world is an enigma, a harmless
> enigma that is made terrible by our own mad attempt to interpret it as
> though it had an underlying truth."
>   -- Umberto Eco
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