Sampler for this object is not defined

[AizazSharif]

Hi,

I am trying to run the current repo for example in pedestrians crosswalk. After installing all the packages, I am getting this error.

The issue has been raised before but is closed now. Any help would be appreciated
Thanks.

[mossr]

This seems to be an issue with Scene not being sampleable, where initialstate(mdp) returns a Scene and the history recorder will try to sample an initial state.

A quick fix would be to add the following to the top of the "ped_crosswalk_with_blindspot.jl" file:

using Random
Base.rand(rng::AbstractRNG, s::Scene) = rand(rng, s.entities)

or

using Random
Base.rand(rng::AbstractRNG, s::Scene) = s

if it shouldn't sample an entity, but deterministically return the Scene (semi-hack at the moment).

But @ancorso should comment on whether this is a fix that should live in AdversarialDriving.jl or AutomotiveSimulator.jl.

[AizazSharif]

using Random
Base.rand(rng::AbstractRNG, s::Scene) = s

This was only working as one of the fixes you have mentioned above. The output is now:

I wanted to ask if there is any other script to run for visualization of the crosswalk scenario.

[mossr]

I think running that file creates a "blindspot.gif" file, no?

[AizazSharif]

Yes, it does (my bad).

Thanks a lot for the help. Looking forward to contributing to this great work :)

[mossr]

No worries! Happy to help :)

[mossr]

I'll leave it open so we can resolve it for everyone else

[ancorso]

Thanks for tracking the issue down @mossr.

It looks like this new requirement stems from a POMDPs.jl v0.9, where initialstate(mdp) should return a distribution. I'll make the needed change.

[ancorso]

Fixed by #6