Pyhton3.6.5 安装Keras之旅-成功首先要先安装好tensorflow，安装过程：https://blog.csdn.net/weixin_52500860/article/details/115839580打开Anaconda prompt没有anaconda也需要提前安装哦！激活tensorflow命令：activate tensorflowconda install mingw

$slice查询修饰符$slice元素会限制数组元素的个数查询输出数组前三个：db.movies.find({title:"Youth Without Youth"},{languages:{$slice:3}}).pretty();查询输出数组后两个db.movies.find({title:"Youth Without Youth"},{languages:{$slice:-2}}).pret