Let's call it pessimism. I tried one for each of the following major 
versions: 378.xx, 376.xx, 375.xx, 373.xx, 368.xx.
I doubt the ones in between will work and the older ones don't support Cuda 
8.

On Thursday, February 16, 2017 at 2:26:47 PM UTC+1, nouiz wrote:
>
> ALL driver is a big statement. There is many bad driver, can you list all 
> the one that you tried?
>
> Fred
>
> On Sat, Feb 11, 2017 at 7:01 AM Kiuhnm Mnhuik <kiuhn...@gmail.com 
> <javascript:>> wrote:
>
>> See https://github.com/Theano/Theano/issues/5529
>> This can't be unrelated. On my system the new backend fails on ALL driver 
>> versions (wrong result or crash and Windows won't boot anymore). There is 
>> no good driver version.
>>
>>
>> On Friday, February 10, 2017 at 7:30:59 PM UTC+1, nouiz wrote:
>>
>>> We seem to hit a bug in some driver version. See this PR:
>>>
>>> https://github.com/Theano/Theano/issues/5530
>>>
>>> It name the drivers working and not working. I fyour driver version 
>>> isn't named there, can you add a comment that name it?
>>>
>>> Fred
>>>
>>> On Wed, Feb 8, 2017 at 3:45 PM Kiuhnm Mnhuik <kiuhn...@gmail.com> wrote:
>>>
>> I created an issue on github but still no answer after 21 hours. Can 
>>>> someone confirm that this code doesn't work correctly?
>>>>
>>>>     import theano
>>>>     import theano.tensor as T
>>>>     import numpy as np
>>>>
>>>>     d = T.vector('d', dtype=floatX)
>>>>     d_np = np.array([1, 1, 1, 1, 0, 1, 1, 1, 1, 1], dtype=floatX)
>>>>     f = theano.function([d], d.sum())
>>>>     print(f(d_np))          # 9.0 with gpu, but 5.0 with cuda
>>>>
>>>>
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