[SCRIPTS] XLNet squad finetuning scripts

[zburning]

Description

finetuning squad

Checklist

Essentials

• PR's title starts with a category (e.g. [BUGFIX], [MODEL], [TUTORIAL], [FEATURE], [DOC], etc)
• Changes are complete (i.e. I finished coding on this PR)
• All changes have test coverage
• Code is well-documented

Changes

• Feature1, tests, (and when applicable, API doc)
• Feature2, tests, (and when applicable, API doc)

Comments

• If this change is a backward incompatible change, why must this change be made.
• Interesting edge cases to note here

cc @dmlc/gluon-nlp-team

[codecov]

Codecov Report

Merging #1012 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1012   +/-   ##
=======================================
  Coverage   78.41%   78.41%           
=======================================
  Files          67       67           
  Lines        6274     6274           
=======================================
  Hits         4920     4920           
  Misses       1354     1354

[mli]

Job PR-1012/1 is complete.
Docs are uploaded to http://gluon-nlp-staging.s3-accelerate.dualstack.amazonaws.com/PR-1012/1/index.html

[mli]

Job PR-1012/2 is complete.
Docs are uploaded to http://gluon-nlp-staging.s3-accelerate.dualstack.amazonaws.com/PR-1012/2/index.html

[mli]

Job PR-1012/3 is complete.
Docs are uploaded to http://gluon-nlp-staging.s3-accelerate.dualstack.amazonaws.com/PR-1012/3/index.html

[mli]

Job PR-1012/4 is complete.
Docs are uploaded to http://gluon-nlp-staging.s3-accelerate.dualstack.amazonaws.com/PR-1012/4/index.html

[mli]

Job PR-1012/5 is complete.
Docs are uploaded to http://gluon-nlp-staging.s3-accelerate.dualstack.amazonaws.com/PR-1012/5/index.html

[mli]

Job PR-1012/6 is complete.
Docs are uploaded to http://gluon-nlp-staging.s3-accelerate.dualstack.amazonaws.com/PR-1012/6/index.html

[mli]

Job PR-1012/29 is complete.
Docs are uploaded to http://gluon-nlp-staging.s3-accelerate.dualstack.amazonaws.com/PR-1012/29/index.html

[mli]

Job PR-1012/30 is complete.
Docs are uploaded to http://gluon-nlp-staging.s3-accelerate.dualstack.amazonaws.com/PR-1012/30/index.html

[mli]

Job PR-1012/31 is complete.
Docs are uploaded to http://gluon-nlp-staging.s3-accelerate.dualstack.amazonaws.com/PR-1012/31/index.html

[zburning]

Including this in #1124