crfchain1constrained
hmatrix
crfchain1constrained  hmatrix  

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crfchain1constrained
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Tracking mentions began in Dec 2020.
hmatrix

Rust concepts I wish I learned earlier
Two things that might help Rust a lot despite the complexity is the tooling and the ecosystem. Cargo is good, the compiler is extremely helpful, and there are a lot of crates to build on for all sorts of tasks.
For example, if I need to use simulated annealing to solve an optimization problem, there already exist libraries that implement that algorithm well.[1] Unfortunately, the Haskell library for this seems to be unmaintained[2] and so does the OCaml library that I can find.[3] Similarly, Agda, Idris, and Lean 4 all seem like great languages. But not having libraries for one's tasks is a big obstacle to adoption.
Nim looks very promising. (Surprisingly so to me.) Hopefully they will succeed at gaining wider recognition and growing a healthy ecosystem.
[1] E.g., https://github.com/argminrs/argmin
[2] https://hackage.haskell.org/package/hmatrixgsl0.19.0.1 was released in 2018. (Although there are newer commits in the GitHub repo, https://github.com/haskellnumerics/hmatrix. Not too sure what is going on.)
[3] https://github.com/khigia/ocamlanneal

Numpy style linear algebra
hmatrix covers the essentials; less featurecomplete than python/matlab, partly because several orders of magnitudes less people use it, partly because it's meant as the "essential core".
What are some alternatives?
crfchain1  Efficient, firstorder, linearchain conditional random fields
hTensor  Multidimensional arrays and simple tensor computations
nimber  Finite nimber arithmetic
hmatrixrepa  Compatability between hmatrix and repa matrices and vectors
mathfunctions  Special mathematical functions
hmatrixquadprogpp  bindings to quadprog++
hmatrixnipals  Haskell library for Nonlinear Iterative Partial Least Squares method for Principal Components Analysis on large datasets
hmatrixbackprop  backprop primitives for hmatrix
hmatrixvectorsized  Conversion between hmatrix and vectorsized types
hmatrixsvdlibc  Haskell bindings for svdlibc
hmatrixmorpheus  Lowlevel machine learning auxiliary functions
hmatrixmmap  Extend the Haskell hmatrix package with the ability to mmap vectors