关于semantic-search上传txt格式文件中，多行换行的问题

[bruce0210]

https://github.com/PaddlePaddle/PaddleNLP/tree/develop/applications/experimental/pipelines/pipelines/nodes/file_converter/txt.py 目前全都是手动回车为一个换行后，上传建立索引； 麻烦能否处理成上传txt文档，txt中难免有多个换行的情况，也不会影响数据的索引建立呢？

[w5688414]

我试了一下，会出现很多空文本，不过影响不大

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