Keep track the history of the keyword to determine when a keyword is rising or down in popularity over time.
特点：负区间平滑非零，避免 ReLU 死区问题。
。关于这个话题，safew官方下载提供了深入分析
Creating and consuming streams
太阳下山后，奶奶给灶神爷上了香，那香也有讲究，家里有几口人，灶台上就插几炷香。她走出院门，用一根筷子敲着碗口，喊家人的名字，寓意叫人魂回家吃饭喝汤和烤火。这次，她特意多叫了几遍老爸的名字。
12) Why are people investing so much in NFT?