egglog
yjs
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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....
yjs
- Show HN: Collaborate on your YC Application with CRDT-powered forms
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Making CRDTs 98% More Efficient
One idea is just to use fewer random bits in peerIDs. Yjs (https://docs.yjs.dev/) gets away with just 32 random bits. If you compromise and use 64 random bits, then even a very popular doc with 1 million lifetime peerIDs will have a < 10^-7 lifetime probability of collision.
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An Interactive Intro to CRDTs
I've seen it come up often in collaborative text editors.
Also see: https://github.com/yjs/yjs
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JSON Schema Store
You are absolutely right that XML is better for document structures.
My current theory is that Yjs [0] is the new JSON+XML. It gives you both JSON and XML types in one nested structure, all with conflict free merging via incremental updates.
Also, you note the issue with XML and overlapping inline markup. Yjs has an answer for that with its text type, you can apply attributes (for styling or anything else) via arbatary ranges. They can overlap.
Obviously I'm being a little hypabolic suggesting it will replace JSON, the beauty of JSON is is simplicity, but for many systems building on Yjs or similar CRDT based serialisation systems is the future.
https://github.com/yjs/yjs/
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Launch HN: Tiptap (YC S23) – Toolkit for developing collaborative editors
Note: https://github.com/yjs/yjs for collaborative "document edition, and user cursors"; has WebRTC, web socket, matrix.org backend
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Wormholers, what can CCP and wormholers do to improve J-Space?
CCP needs to revamp proto anyway, due to recent exploits... practically, nothing really prevents 'em from using some sort of CRDT's to make the state of the sig view eventually consistent (yjs lib, if we're speaking frontendian).
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How to use Yjs with Ruby on Rails?
Yjs framework: Because it is a CRDT implementation which provides collaborative editing and offline-first capability.
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🐑🐑🐑 EweserDB, the user-owned database 🐑🐑🐑
No problem. The database CRUD features are just helpers as an abstraction on top of yjs: https://docs.yjs.dev/. Eweser adds schemas in the form of typescript types to make using it simpler, more structured, and interoperability easier.
- Ask HN: What is new in Algorithms / Data Structures these days?
- How does Google docs send the changes done by other users in real-time?
What are some alternatives?
ezno - A JavaScript compiler and TypeScript checker written in Rust with a focus on static analysis and runtime performance
automerge - A JSON-like data structure (a CRDT) that can be modified concurrently by different users, and merged again automatically.
libclc - Cache Line Container - C11
liveblocks - Liveblocks is a platform to ship collaborative features like comments, notifications, text editors in minutes instead of months.
scryer-prolog - A modern Prolog implementation written mostly in Rust.
automerge-rs - Rust implementation of automerge [Moved to: https://github.com/automerge/automerge]
flix - The Flix Programming Language
crdt-woot - Implementation of collaborative editing algorithm CRDT WOOT.
mpack - MPack - A C encoder/decoder for the MessagePack serialization format / msgpack.org[C]
milkdown - 🍼 Plugin driven WYSIWYG markdown editor framework.
ntfy-android - Android app for ntfy.sh
MobX - Simple, scalable state management.