out of core是什么意思？

core其实就是内存的意思，out-of-core就是不在内存里进行。

没有把全部数据都一次性读取到内存进行处理的方式就是out-of-core。这个概念和online learning或者mini-batch可以认为是差不多的意思。

sklearn的官方文档的解释：“An efficiency strategy where not all the data is stored in main memory at once, usually by performing learning on batches of data.”