unspecified launch failure in `log.(::CuArray)` on CUDA 8.0

[juliagpu]

unspecified launch failure in `log.(::CuArray)` on CUDA 8.0

[MikeInnes]

exp is actually written in pure Julia at this point, so we just compile that version for the GPU :)

[maleadt]

See the current limitations. You need to use CUDAnative.log (and alike for other intrinsics).

[MikeInnes]

The @fix macro is supposed to fix this up automatically, so I'll have to look into why that's not working.

[gustafsson]

@maleadt If you don't mind me asking, how come it works for exp which is also an intrinsic?

I'm willing to help out if I can.

[MikeInnes]

julia> Flux.crossentropy(x,x)
ERROR: Broadcast output type Any is not concrete

This is the error I get on latest versions of things, which is a different issue – is that the same for you?

[gustafsson]

Yes, I got the same error when I tried to use Flux.crossentropy. I then ran into this other error of when I was trying to dive down and create a minimal example.

[MikeInnes]

Ok, so the issue there is that there's a type instability somewhere the broadcast call. The way to investigate that is to poke through @code_typed for crossentropy (the problem might exist for normal arrays as well, but just show up as poor performance rather than an error).