Fix: update ltp word segmentation call in mlm_wwm
Author: xyh1756
Pull request: yes

# What does this PR do?

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The method 'seg' has been removed in ltp 4.2.10, so the script is currently not runnable. We can use method 'pipeline' instead.


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@VictorSanh 

Comments:
_The documentation is not available anymore as the PR was closed or merged._

@VictorSanh 
please take a look

@sgugger 

Thanks but we're not actively maintaining those research projects. You'll need a review of the original author to get this merged, or just use the old versions of the libraries :-)

> Thanks but we're not actively maintaining those research projects. You'll need a review of the original author to get this merged, or just use the old versions of the libraries :-)

@wlhgtc please take a look :-)

@xyh1756  This changes is fine. 
But you have to make sure all checks pass~ Seems you need to use `black`  to format your code.

@sgugger @wlhgtc 
seems all checks pass :-)

> @sgugger @wlhgtc seems all checks pass :-)

LGTM ,  @sgugger   can you help me merge it~