here are some pages that might be relevant https://ncatlab.org/nlab/show/tensor+network https://ncatlab.org/nlab/show/tensor+network https://ncatlab.org/nlab/s

here are some pages that might be relevant https://ncatlab.org/nlab/show/tensor+network https://ncatlab.org/nlab/show/tensor+network https://ncatlab.org/nlab/show/string+diagram https://ncatlab.org/nlab/show/string+diagram