CoinBLAS
dflex
CoinBLAS | dflex | |
---|---|---|
3 | 129 | |
21 | 1,729 | |
- | 0.4% | |
1.8 | 8.1 | |
almost 3 years ago | 26 days ago | |
Jupyter Notebook | TypeScript | |
- | MIT License |
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CoinBLAS
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The "missing" graph datatype already exists. It was invented in the '70s
When you consider that a graph and a matrix are isomorphic, doing vector matrix multiplication takes a vector with a set value, say row 4, and multiplies it by a matrix where row 4 has values present that represent edges to the nodes that are adjacent to it (ie "adjacency" matrix). The result is a vector with the next "step" in a BFS across the graph, do that in a loop and you step across the whole graph.
A cool result of this is, for example, taking an adjacency matrix and squaring it is the "Friend of a Friend" graph. It takes every node/row and multiplies it by itself, returning a matrix that are adjacent to the adjacencies of each node, ie, the friends (adjacencies of the adjacencies) of friends (adjacencies) of the nodes.
Deeper traversal are just higher nodes, a matrix cubed are the friends of the friends of the friends.
A picture is worth a thousand words, see figure 7 of this paper:
https://arxiv.org/pdf/1606.05790.pdf
Also check out figure 8, this shows how incidence matrices can work to represent hyper and multi graphs. An pair of incidence matrices reprsent two graphs, one from nodes to edges and the other from edges to nodes, these are n by m and m by n. When you multiply them, you get a square adjacency matrix that "projects" the incidence into an adjacency. This can be used to collapse hypergraphs into simple graphs that use different semirings to combine the multiple edges.
For some pretty pictures of this kind of stuff, check out CoinBLAS (note I am not a crypto-bro, it was just a very handy extremely large multi-graph that I could easily download in chunks to play with):
https://github.com/Graphegon/CoinBLAS/
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Ask HN: What Are You Working On?
Python wrapper around The GraphBLAS API:
https://github.com/michelp/pygraphblas
For an upcoming paper we've open sourced using pygraphblas to analyse the bitcoin graph using the GAP benchmarks on a server with 1TB of RAM:
https://github.com/Graphegon/CoinBLAS
- Show HN: CoinBLAS – Bitcoin Analysis with the GraphBLAS
dflex
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Introducing DFlex - A Modern Javascript Drag and Drop Library
I'd love for you to check out the DFlex website to see examples and live demos. Let me know if you end up building something cool with DFlex! I'm always looking for feedback to help improve the library.
- Show HN: Removing esbuild reduces bundle size by 30%
- DFlex – The JavaScript Library for Modern Drag and Drop Apps
- Show HN: DFlex – JavaScript framework for modern Drag and Drop apps
- DFlex - a Javascript library for modern Drag and Drop apps. It's built with vanilla Javascript and implemented an enhanced transformation mechanism to manipulate DOM elements
- DFlex: Javascript framework for modern Drag and Drop apps
- Show HN: JavaScript Drag-N-Drop Framework for Modern Apps
- Show HN: Enable DOM reconciliation for transformed elements
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