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| Notation | Description |
|---|---|
| z t | Update gate |
| r t | Reset gate |
| o t | Output gate |
| Current memory content | |
| h t | Output state |
| h t−1 | Previous output state |
| σ | sigmoid |
| tanh | tanh |
| W, Wz | Weights |
| × | Multiplication |
| ⊙ | Element wise multiplication |
