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Non-stationarity refers back to the evolving character of the info distribution over time. A lot more precisely, it can be characterised as a violation from the Strict-Sense Stationarity affliction, defined by the subsequent equation:?�乎，�?每�?次点?�都?�满?�义 ?��?�?��?�到?�乎，发?�问题背?�的世界??T