[theano-users] 2nd (and 3rd) highest value of a 2D tensor

[Andre Holzner]

Good morning,

I want to get the 2nd (and possibly 3rd) highest value in a 2D tensor
(output of a convolutional layer).

What would be the simplest way of implementing this in Theano ?

I saw that there is support for iterating
(http://deeplearning.net/software/theano/library/scan.html )
and IfElse operations
(http://deeplearning.net/software/theano/tutorial/conditions.html), that
in principle should allow me to implement this ? Will this also generate
CUDA code when I run
with the GPU backend or will the operation be performed on the CPU ?

thanks a lot,

Andre

[Frédéric Bastien]

Check this issue:

https://github.com/Theano/Theano/issues/5608

Using scan for that is a bad idea, it would be very slow. There isn't a
very good solution right now, but in this issue, it indicate some way to do
that.

Fred

Post by Andre Holzner
Good morning,
I want to get the 2nd (and possibly 3rd) highest value in a 2D tensor
(output of a convolutional layer).
What would be the simplest way of implementing this in Theano ?
I saw that there is support for iterating (
http://deeplearning.net/software/theano/library/scan.html )
and IfElse operations (
http://deeplearning.net/software/theano/tutorial/conditions.html), that
in principle should allow me to implement this ? Will this also generate
CUDA code when I run
with the GPU backend or will the operation be performed on the CPU ?
thanks a lot,
Andre
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