On Thursday, June 29, 2017 at 10:17:26 AM UTC-4, Sym wrote:
>
> I am using theano 0.9.0 and this function does not exist.. I can't find it
> in the documentation either !
>
That would be theano.tensor.and_ with a trailing underscore.
> And in the theano docs it says that :
> __{abs,neg,lt,le,gt,ge,invert,and,or,add,sub,mul,div,truediv,floordiv}__
> Those elemwise operation are supported via Python syntax.
>
This is true, but the Python syntax that will call `__and__` is actually `a
&& b`, not `a and b`.
So you can use `a && b`, `and_(a, b)`, or `a * b` if you prefer.
>
> Le mercredi 28 juin 2017 21:15:37 UTC-4, nouiz a écrit :
>>
>> Don't use the Python "and" operation. Use theano.tensor.and(a,b) instead.
>> I think it will fix your problem.
>>
>> Le mer. 28 juin 2017 10:26, Sym <mass.c...@gmail.com> a écrit :
>>
>>>
>>> I want to build a piecewise function with theano, for instance a
>>> function that is nonzero only in the interval [2,3].
>>>
>>> Here is the minimal code reproducing the error :
>>>
>>>
>>> import theano
>>> import theano.tensor as T
>>> import numpy as np
>>> import matplotlib.pyplot as plt
>>>
>>> r = T.scalar()
>>> gate = T.switch( T.ge(r,2.) and T.le(r,3.) , 1., 0.)
>>> f = theano.function([r],gate)
>>> x = np.arange(0.,4.,0.05,dtype='float32')
>>> y = [f(i) for i in x]
>>> plt.plot(x,y)
>>>
>>>
>>>
>>> The result is the following : https://i.stack.imgur.com/XMQme.png
>>>
>>> Which is clearly not correct : only one condition is satisfied here.
>>>
>>>
>>> If I replace T.switch by theano.ifelse.ifelse the result is the same...
>>>
>>> Is it a known bug, or am I missing something here?
>>>
>>>
>>> Thanks a lot !
>>>
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>>
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