The implementation of binary operations such as += and -= in Sparse module is very inefficient. When the sparse vector/matrix dimension is big, it causes out of memory. += and -= should just modify the original sparse vector/matrix in place without allocating new memory.
I'm not sure how exactly you intend to perform this in-place if the non-zero patterns do not match. If you are certain that they match, you can access the values directly with a Map on .valuePtr()
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