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I'm not sure if, at this point, the simple_eval is the right place to put all this code. It's the thing I implemented, but I could use some direction from code maintainer where this makes sense to add to the codebase.
It was a bit trickier to test this as the docs don't really give inputs/outputs, their tests simply match against an alternative implementation of LSTM. So I've done basically the same thing, where I checked that the implementation here matches the output of pytorch's LSTM node.