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GRU

As explained in Sutskever's List

A gated recurrent unit is a recurrent neural-network unit that uses learned gates to regulate state updates.

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

How Sutskever's List covers it

How deep it goes
Explains bidirectional encoding and decoder inputs but stops short of detailing individual gate equations.
Examples
Uses bidirectional sentence encoding, a 1,000-unit decoder, and WMT English–French translation results.
What it assumes
Assumes recurrent neural-network and hidden-state concepts while situating GRUs within encoder-decoder translation.
What you can do after
Evaluate how GRU-based encoder-decoder systems support translation with attention and handle longer sentences.
How it connects
Connects GRUs to recurrent neural networks, encoder-decoder models, hidden states, attention mechanisms, and machine translation.

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