A gated recurrent unit (GRU) is a recurrent neural-network unit whose learned gates regulate updates to its hidden state. In Bahdanau, Cho, and Bengio’s RNNsearch architecture, bidirectional GRUs encode a sentence while a GRU decoder generates its translation. section 5.3
The encoder runs one GRU forward and another backward, joining their outputs into word-level annotations. The decoder uses a 1,000-unit GRU that combines its previous state, the last generated word, and an attention-derived context vector. section 5.3
GRUs in neural machine translation
On the WMT English–French benchmark, RNNsearch paired GRU encoding and decoding with attention, outperforming fixed-vector encoder-decoder baselines as sentence-length limits increased. section 5.3






