egglog
ezno
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egglog
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Towards a New SymPy
The herbie project using egraphs to explore different ways of rewriting floating point expressions. https://herbie.uwplse.org/ One can also write custom rulesets in egglog (a new egraph rewriting system / language / datalog) https://egraphs-good.github.io/egglog/?example=herbie
The approach is not yet anywhere near being able to touch all the domains sympy can handle. Destructive term rewriting tends to be a bit more forgiving to unsoundness in the rules and still returning roughly meaningful results. EGraph rewriting (and other automated reasoning systems) tend to just return junk as soon as you aren't careful about your semantics. Associativity and commutativity are ubiquitous in CAS applications and encoding these concepts in general purpose terms is rather unsatisfying. The post above emphasizes specialty methods for polynomials, which it would be desirable to find a clean way to integrate into egraph techniques. Variable binding (which is treated in a rather mangled form in CAS systems) is seemingly important for treating summation, differentiation, and integration correctly. The status of doing variable binding efficiently and correctly in egraphs is also unclear imo.
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What is the state of the art for creating domain-specific languages (DSLs) with Rust?
For semantic analyzers, check out egg and egglog. They're custom data structures for representing compiler rewrite rules in a non-destructive way.
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Ask HN: What is new in Algorithms / Data Structures these days?
The recent work on relational, datalog-inspired egraphs in PLDI this year ("Unifying Datalog and Equality Saturation") is actually interesting because it can solve cases like the y/x*x -> y identity example, by the power of an interval analysis on x (among other things.) Sort of like adding a postulate but instead it's by adding relations between terms in the graph.
https://github.com/egraphs-good/egglog
https://arxiv.org/pdf/2304.04332.pdf
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Better Together: Unifying Datalog and Equality Saturation
Close, but the link is on Page 13, and it points here: https://github.com/mwillsey/egg-smol
Unfortunately the naming is all a bit confusing, isn't it....
ezno
- Ezno's checker (Rust based type checker and compiler) is now open source
- Ezno's checker (a Javascript type checker and compiler written in Rust) is now open source
- Ezno: A TypeScript checker written in Rust
- Show HN: Ezno, a TypeScript checker written in Rust, is now open source
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Ask HN: What is new in Algorithms / Data Structures these days?
> I'm curious if there are any practical reasons we don't see them implemented in more languages.
I believe it's because they're not exactly easy to implement and the resulting extensive type checking might also affect compiler performance.
By the way, another great example of refinement types (in JavaScript) is this one: https://kaleidawave.github.io/posts/introducing-ezno/
- Open sourcing Ezno – JavaScript compiler and TypeScript checker written in Rust
What are some alternatives?
libclc - Cache Line Container - C11
highfleet-ship-opt - A c/c++ module and python extensions for automatic optimization of Highfleet ship modules. Try it live at https://hfopt.jodavaho.io
scryer-prolog - A modern Prolog implementation written mostly in Rust.
stc - Speedy TypeScript type checker
flix - The Flix Programming Language
rfcs - RFC process for Bytecode Alliance projects
yjs - Shared data types for building collaborative software
mpack - MPack - A C encoder/decoder for the MessagePack serialization format / msgpack.org[C]
clingo - 🤔 A grounder and solver for logic programs.
ntfy-android - Android app for ntfy.sh