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Add a "gradient zoo" page? #2447

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mcabbott
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@mcabbott mcabbott commented May 14, 2024

A while back I tried to write up a docs page pointing out that Flux is AD-agnostic -- anything which produces an appropriately nested structure should work.

This is a rough draft, help with tidying it up would be welcome.

Perhaps it's too opinionated about other packages. Certainly any opinions it offers should have clear dates attached.

Rendered version: https://github.com/mcabbott/Flux.jl/blob/grad_zoo/docs/src/tutorials/gradient_zoo.md

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codecov bot commented May 14, 2024

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 71.52%. Comparing base (32db5d4) to head (6707c6f).
Report is 1 commits behind head on master.

Additional details and impacted files
@@             Coverage Diff             @@
##           master    #2447       +/-   ##
===========================================
+ Coverage   33.20%   71.52%   +38.31%     
===========================================
  Files          31       31               
  Lines        1843     1921       +78     
===========================================
+ Hits          612     1374      +762     
+ Misses       1231      547      -684     

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* Long compilation times, on the first call.

* Does not at present work on all Flux models, due to missing rules.
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Out of curiousity, what models does it not work on atm?

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FWIW all the CPU Flux tests I know of presently pass (and please let me know any failing ones so I can fix them), including some which Zygote fails on:

# TESTS BELOW ARE BROKEN FOR ZYGOTE BUT CORRECT FOR ENZYME!

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That's great!

Sorry this was written a few months back, and I don't recall what issues I ran into. I see many have been fixed.


New package which works on the LLVM code which Julia compiles down to.

* Allows mutation of arrays.
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@wsmoses wsmoses May 14, 2024

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I might also add high-performance :) [by virtue of pioneering the "run after optimization" trick (https://proceedings.neurips.cc/paper/2020/file/9332c513ef44b682e9347822c2e457ac-Paper.pdf)]


* Does not always handle type instability.

* Custom rules by its own rules... Generally fewer such rules than Zygote, and at a lower level -- applied to `BLAS.gemm!` not `*`.
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Enzyme also supports importing chainrules as well (though it is discouraged as they are usually lower-performance for sake of not understanding mutation)

Zygote.hessian is like this.

### Enzyme.jl

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Haven't used on Flux functions, but it is well tested in our CI

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