Blog post for argmin version 0.10.0 and argmin-math version 0.4.0

media/website/content/blog/version-v0.10.0.md

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+title = "argmin 0.10.0 and argmin-math v0.4.0"
+description = ""
+date = 2024-02-27T00:00:00+00:00
+updated = 2024-02-27T00:00:00+00:00
+draft = false
+template = "blog/page.html"
+
+[taxonomies]
+authors = ["Stefan Kroboth"]
+
+[extra]
++++
+
+<b>argmin</b> is a Rust library which offers a range of numerical optimization methods and is a framework for 
+developing optimization algorithms.  Details about the design and features of argmin can be found on
+[the website](https://argmin-rs.org),
+in the [book](https://argmin-rs.org/book),
+on [Github](https://github.com/argmin-rs/argmin),
+on [crates.io](https://crates.io/crates/argmin) and
+on [lib.rs](https://lib.rs/crates/argmin).
+
+## argmin 0.10.0
+
+argmin has seen a few smaller, but partially breaking changes in this release.
+
+##### Observers and Checkpointing (Breaking)
+
+Observers and checkpointing were moved from argmin into dedicated crates. This greatly reduced the
+complexity of argmin and the number of its dependencies. Now users can decide which observers
+and checkpointing they actually need, thus potentially reducing compile times and code size.
+
+Notable changes:
+* `SlogLogger` is now part of the [argmin-observer-slog](https://crates.io/crates/argmin-observer-slog) crate.
+* `WriteToFile` was renamed to `ParamWriter` and is now part of the
+[argmin-observer-paramwriter](https://crates.io/crates/argmin-observer-paramwriter) crate.
+* `FileCheckpoint` is now part of the
+[argmin-checkpointing-file](https://crates.io/crates/argmin-checkpointing-file) crate.
+
+Furthermore, `Observe::observe_init`, which is called after initialization of the solver, now also
+has access to the `state`, meaning that it can observe the initial state of the optimization run.
+
+##### Interrupt handling (Breaking)
+
+Interrupt handling now includes `SIGINT`, `SIGTERM` and `SIGHUP`. Consequently,
+`TerminationReason::KeyboardInterrupt` was renamed to `TerminationReason::Interrupt`.
+This is a breaking change for those who match on `TerminationReason`.
+
+##### The optional `serde1` feature
+
+With moving observers out of the argmin crate, it became easier to reason about the optional
+`serde1` feature, which eventually led to the removal of the `SerializeAlias` and `DeserializeAlias` traits.
+Activating `serde1` for argmin is now only necessary for checkpointing.
+
+##### Other changes and fixes
+
+* In `GaussNewton`, the residuals were out of sync with the parameter vector
+(Thanks [@gmilleramilar](https://github.com/gmilleramilar) for reporting
+and starting the fix).
+
+* A failing line search in `LBFGS` now does not lead to the error propagating to the 
+`Executor` but instead causes `LBFGS` to terminate with `TerminationReason::SolverExit(string)` where
+`string` indicates the reason why the line search failed.
+
+* The random number generator (RNG) used in `ParticleSwarm` can now be set by 
+users (Thanks to [@jonboh](https://github.com/jonboh)).
+
+* All crates are now in the `crates` directory of the argmin monorepo.
+
+* All examples are now in dedicated crates in the `examples` directory.
+This makes it easier for users to see which dependencies (and features) an example requires.
+
+* argmin-math dependency updated to version 0.4.
+
+## argmin-math 0.4.0
+
+##### Removal of `*-serde` features (Breaking)
+
+All features ending with `-serde` were removed. Support for serde is now enabled simply be enabling
+serde support in the backends (`ndarray` or `nalgebra`). Using `*-serde` features will cause a failing
+build, which can be solved without loss of functionality by removing `-serde` from the feature.
+
+##### Development on Windows
+
+Thanks to [@Tastaturtaste](https://github.com/Tastaturtaste) development on Windows is finally possible.
+This was achieved by using MKL in the `argmin-math` tests and involved a lot of effort to be able to continue
+supporting multiple versions of ndarray.
+
+##### Other changes (Breaking)
+
+* `ArgminInv` is now also implemented for scalars (`f32` and `f64`, thanks to [@sdrap](https://github.com/sdrap)).
+* `ArgminRandom::rand_from_range(...)` now also accepts a random number generator. This allows for setting 
+the seed manually (Thanks to [@jonboh](https://github.com/jonboh)).
+* Tests for `ArgminMinMax` were added (Thanks to [@Shreyan11](https://github.com/Shreyan11)).
+
+## Contributing
+
+There currently are [a couple of open issues](https://github.com/argmin-rs/argmin/issues), some of which
+are good first issues to start getting involved in argmin. I am happy to provide guidance if needed.
+
+Suggestions and feature requests are also welcome. For instance, let me know which observers
+or checkpointing methods yo would like to see.
+
+## Conclusion
+
+This release mostly affected the project structure, which was an important step for further development.
+By moving observers and checkpointing into dedicated crates, the dependencies of argmin could be reduced 
+and users have more freedom in pulling in only what they need.
+The changes to `ParticleSwarm` and `ArgminRandom` allow for reproducible runs by setting an RNG seed.
+Interrupt handling has become more useful by capturing more interrupts.
+Finally, development on Windows is possible.
+
+This release included contributions from
+[@gmilleramilar](https://github.com/gmilleramilar),
+[@jonboh](https://github.com/jonboh),
+[@Tastaturtaste](https://github.com/Tastaturtaste),
+[@Shreyan11](https://github.com/Shreyan11),
+[@sdrap](https://github.com/sdrap), and
+[@stefan-k](https://github.com/stefan-k).
+Thanks to the contributors and those who opened and responded to issues and discussions!
+
+A bit offtopic, but I want to use this opportunity to give a shoutout to
+[gkls-rs](https://crates.io/crates/gkls-rs), a pure Rust implementation of the GKLS function
+generator by [@jonboh](https://github.com/jonboh).
+
+## Discord server
+
+If you're interested you're invited to join the  [Discord](https://discord.gg/fYB8AwxxMW)!
+
+
+<br>
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