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Since scipy 1.8 (released in May 2022), csr_array is the preferred sparse array constructor. We should aim towards using this version as a base.
However, there are some issues this will entail:
- The
eye,kron,diagsare not implemented in scipy forcsr_array. And aren't in 1.12 either. So we will have to work around this issue regardless. - We are not really using the matrix multiplication method of
csr_matrix, so the changes should be rather minimal in this sense.
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