What do you think of 'Programming with a Differentiable Forth Interpreter'[0] and 'A Neural Forth Abstract Machine'[1]? I don't know if they are related to your work, but both are on my to-read pile.

[0]: https://arxiv.org/abs/1605.06640 [1]: http://people.idsia.ch/~rupesh/rnnsymposium2016/files/bosnja...