I believe [1] is the work they're mainly referencing for their RNN equivalent/inspiration. [1] https://nlp.stanford.edu/~johnhew/rnns-hierarchy.html https://nl

I believe [1] is the work they're mainly referencing for their RNN equivalent/inspiration. [1] https://nlp.stanford.edu/~johnhew/rnns-hierarchy.html https://nlp.stanford.edu/~johnhew/rnns-hierarchy.html