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Sequence Models

Backpropagation Through Time

Inspect exact recurrent state derivatives backward through time.

A recurrent network carries a hidden state from one observation to the next.

Why do we need this? Sequential predictions need information from earlier observations.

A hidden state connects consecutive observationsA hidden state connects consecutive observationsTime 1?Hidden stateTime 2?Hidden stateTime 3?Hidden stateTime 4?Hidden stateTime 5?Hidden state1Input1 ›Previous hidden state: 0
Recurrent connection →Current input / state← Backward sensitivity
STEP 1 OF 25

Time 1: Read an input

The sequence supplies one observation at a time.

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