[NDTensors] Start SparseArrayDOKs module
#1270
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## main #1270 +/- ##
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This introduces the module
SparseArrayInterface, which defines sparse versions of various Julia Base functions likesparse_getindex,sparse_setindex!,sparse_map[!], etc. which make use of the sparsity structure of an array given some minimal overloads accessing the sparse storage and how multidimensional indices map back and forth to locations in the sparse storage.Then, it defines a concrete sparse array type called
SparseArrayDOK(for dictionary-of-keys) in aSparseArrayDOKsmodule that makes use ofSparseArrayInterfaceto provide a lot of AbstractArray Julia functionality. The design is similar to that in SparseArrayKit.jl, with some key differences such as being based onSparseArrayInterface, using Dictionaries.jl for the dictionary implementation instead ofBase.Dict, and allowing for a more generic zero element type which will be used by theBlockSparseArraytype inBlockSparseArrays.Some things to do:
SparseArrayInterfaceinDiagonalArraysto simplify the implementation there (i.e. make it simpler to define indexing, map/broadcast, etc.).The rest of the action items were moved to #1250 to keep this PR more self-contained.