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Option for less memory consumption when computing hessian #1994

@TimoSommer

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@TimoSommer

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Thank you very for working hard to make it possible to compute the hessian as well! However, on local resources, I always run out of memory (OOM) using this option for medium-sized molecules (50 atoms or so). This issue was actually already addressed (#1361), but the vram option in the function there, which makes it possible to drastically reduce memory consumption to a more normal level, is unfortunately not an option in the currently implemented method (#1811). Is it possible to add such an option back in, or is there any other currently implemented way to reduce the memory consumption when calculating the hessian?

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