JuliaDiff / JuliaDiff/DiffRules.jl
rule for tanh has catastrophic cancellation for |x| > 20
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- Dominant language
- Julia
- Stars
- 74
- Forks
- 36
- Avg merge
- 1d 1h
- Merged PRs (30d)
- 1
Description
One could simply revert #30 to fix this, but if one wants CSE then it can be calculated from first principles. I started a discussion which has numerical examples.
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First steps
- Read the whole issue, then the project's contributing guide.
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- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Inspect the tanh derivative rule and review the changes in #30 first, then read the linked discussion for the numerical examples and proposed CSE approach. Done means the rule avoids catastrophic cancellation for |x| > 20 while matching the accurate derivative behavior shown in those examples.
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Assessment
- Tech stack
- julia
- Domain
- tooling
- Issue type
- Bug
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 35/100