Memory optimisation about krylovkit.jl HOT 3 CLOSED

My apologies for failing to respond to this. To this date, KrylovKit is not the most memory friendly, i.e. it is not reusing memory from previous vectors (e.g. the Krylov subspace from the previous iteration). This, you can notice based on the fact that, if you implement the linear operator as a function, KrylovKit only requires, or in fact only accepts, an out of place method, which allocates a new vector for the result of the application of the linear map. Replacing this with in-place methods that reuse the memory has been on the todo list from day one, but so far has not happened. Hopefully I will find the time one day.

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thank you

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I will close this in favor of Issue #9 , which is really the same issue at the core. Feel free to reopen if there is anything GPU specific that I should think about.

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