Josef,
thanks for double checking - I indeed had an error in my scripts - now I
too get the same results for 32bit and 64bit.
sorry for the false alarm.
best,
Peter
2013/8/24 <josef.p...@gmail.com>
>
>
>
> On Sat, Aug 24, 2013 at 1:41 PM, Peter Prettenhofer <
> peter.prettenho...@gmail.com> wrote:
>
>> Hi,
>>
>> while investigating some 64bit vs. 32bit differences in the GBRT code I
>> stumpled upon this ticket [1].
>> Even though its quite old, I can confirm that it holds on my virtual
>> machines (np 1.7.1).
>> Basically, np.random.RandomState(seed) gives different results on 64bit
>> and 32bit architectures - this might cause different results on different
>> architectures for a number of algorithms incl. stochastic gradient
>> boosting, random forest, SGD
>>
>
> Are you sure this is not a pickle issue?
>
> using seed=123 without pickling, I get the same numbers on Windows32
> oldest versions that I have and Windows64 newest versions.
>
> Also, IIRC, numpy.random has unit tests that check that the random numbers
> that are generated are platform independent, and the same across versions.
> (there was a mess, when Enthought once changed the random number generator
> for the normal distribution, that triggered the addition of those unit
> tests.)
>
> Josef
>
>
>>
>> best,
>> Peter
>>
>> [1] http://mail.scipy.org/pipermail/numpy-tickets/2007-March/000810.html
>>
>> --
>> Peter Prettenhofer
>>
>>
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