1. 原因：windows自身的问题。

Some algorithms in Gensim (mostly the distributed/parallelized versions) call a function called chunkize, which splits an input stream of records into batches. It works in a streaming manner (lazy batch iteration). chunkize has an optional parameter that can actively prepare and buffer data batches in advance: not quite lazy, but also not eager (buffers a limited fixed number of batches in advance).

This optional functionality is not available on Windows, because it uses multi-processing and is slower. So on Windows, only chunkize_serial is available (no buffering). It's aliased to chunkize for API compatibility reason.

This is a rather technical point, related to performance on slow I/O input streams on Windows. You can probably ignore it.

A PR that clarifies the warning will be very welcome! We should probably only emit that warning when that situation actually happens (chunkize called with maxsize > 0 on Windows), rather than always on import.

2. 方案 直接忽略该警告即可。在导入gensim 之前，可以使用此代码抑制消息：

import warnings
warnings.filterwarnings(action='ignore',category=UserWarning,module='gensim')
import gensim