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InfluxDB
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Using Linear Algebra to solve Graph problems, in particular, algebra over Tropical Semirings. Here's a great, but not graph specific, introduction to the advanced math behind the subject by Madeline Brandt:
https://www.youtube.com/watch?v=S_bVv7Lau-s
There is an open source effort to bring this style of mathematical analysis to graph optimization problems (shortest path, resource scheduling, etc) called the GraphBLAS:
https://graphblas.github.io/
I am the author of the pygraphblas Python binding around the GraphBLAS library, you can find a lot of examples in the demo notebooks shown in the README:
https://github.com/Graphegon/pygraphblas