Allow OpenCL simplex to use softmax?
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- Dominant language
- C++
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Description
Description
I'm in the process of writing out the deserializer for OpenCL so we can have models that run entirely on the GPU. We do not yet have a simplex_constrain/unconstrain function in OpenCL.
I could do the stick breaking scheme on the gpu, I think it would be a weighted prefix product. That's possible for me to write but will take me a minute. The other alternative is just to use softmax. Since that's just exp(x_i) / sum(exp(X)) that's much easier to write for the GPU.
The downside of the softmax is that the cpu/gpu versions will be different, but we could just add that to the user docs so people know.
Does anyone have thoughts on this?
Current Version:
v4.7.0
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start by locating the OpenCL entry points for simplex_constrain/unconstrain and the existing softmax implementation; the issue names no files or tests. Review the stick-breaking and softmax alternatives, then establish the expected CPU/GPU behavior and documentation changes before determining what would count as done.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- cpp
- Domain
- hpc
- Issue type
- Feature
- Difficulty
- 5/5
- Estimated time
- Over a week
- Activity status
- Stale
- Clarity
- Needs clarification
- Newbie friendliness
- 20/100