This symbol represents the state of the input neuron to the LSTM.
This symbol represents the state of the input neuron to the Long Short-Term Memory block. It stands for a vector of real values.
The symbol, \(u\), represents the state of the input neuron to the Long Short-Term Memory block. It stands for a vector of real values. It is typically used with a related timestep, e.g. \(u(n)\) represents the state of the input neuron at time \(n\).