Exponential Moving Average (EMA)

https://medium.com/analytics-vidhya/understanding-exponential-moving-averages-e3f020d9d13b

$y_{t+1}=\alpha y_t+(1-\alpha )y_{t-1}$

An EMA model (Exponential Moving Average model) is typically used in machine learning to maintain a smoothed version of a model’s parameters over time.