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[WIP]Implemented LIL format for sparse array #17160
References to other Issues or PRs
Brief description of what is fixed or changed
The idea comes from the standard format of sparse matrix. Would it be interesting as well to implement such data structure in sparse array so that some operations can be more efficient? The current format that Sparse Array module uses is DOK.
The format LIL is efficient in incremental construction.
Your release notes are in good order.
Here is what the release notes will look like:
This will be added to https://github.com/sympy/sympy/wiki/Release-Notes-for-1.5.
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