机器学习的核心目标是在未见过的新数据上实现准确预测。 当模型在训练数据上表现良好，但在测试数据上表现不佳时，即出现“过拟合”。这意味着模型从训练数据中学习了过多的噪声模式，从而丧失了在新数据上的泛化能力。 那么，过拟合的根本原因是什么？具体来说， ...

On January 28, Chinese New Year's Eve, trucks loaded with goods were bustling in and out of the Zhengzhou International Land ...

China's railways have transported over 200 million passengers since the 40-day Spring Festival travel rush kicked off on ...

每当我听到那激动人心的音乐，不禁想起了共舞的时光。在当下这个充满竞技性的舞蹈舞台上，是否还有多少舞者能记得舞蹈最初的样子？当我们从舞台的Battle切换到Party或Club，身边的人只是端着酒杯慢慢摇晃，有多少舞者因‘曲不对技’而被迫停下？这时，不禁令人想起1971年首播的舞蹈节目《Soul Train》。 这一档节目将黑人的音乐和舞蹈搬上了银幕，呈现出一种全新的表演形式。那些充满魅力的黑人舞者 ...

7月一个醉人的傍晚，这一家人下了火车。在金色的夕阳下，田野和树木看上去美极了，鸟儿欢快地唱着歌，天空一片蔚蓝。可就在他们到达坎特维尔古堡的时候，天空中出现了乌云，十来只巨大的黑鸟盘旋在他们的头顶上，接着豆大的雨点便开始落下来。

More than 304 million inter-regional passenger trips were made across China on Friday, the fourth day of this year's Spring Festival holiday, as the most celebrated holiday in the country featured ...

SBS承认全澳大利亚传统的拥有者。© 2025 SBS ...

Late at night on January 15, the maintenance workers were working feverishly to inspect and maintain a train of high-speed trains. The institute is responsible for the maintenance and repair of some h ...

东西方对“蛇”有不同解读，电影也常常将“蛇”具象化。但蛇一般都跟蜘蛛、蝎子一样，被人们归纳为一窝“坏蛋”，和邪恶、阴险、狡猾及魅惑等负面污名挂钩。蛇也成为导演们表达恐惧、惊悚和奇幻等主题的绝佳载体，电影中出现的“蛇”也都成了魔怪的化身。

可能网页地址输入错了，请再核对下吧^-^ ...

LANZHOU, Jan. 18 (Xinhua) -- During this year's Spring Festival travel rush, busy staff members at Lanzhou West Railway Station are joined by a group of foreign students, who help passengers carry ...

Late-night hustle, a "health check" for high-speed trains. Follow Rick to the Beijing North EMU Depot, where dedicated workers inspect every inch of the trains. See how these teams ensure safe ...