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Non-stationarity refers to the evolving mother nature of the data distribution as time passes. More specifically, it can be characterised like a violation of the Rigorous-Sense Stationarity condition, outlined by the following equation:?�乎，�?每�?次点?�都?�满?�义 ?��?�?��?�到?�乎，发?�问题背?�的世界?