Experimental sequence tagging datasets

[akurniawan]

Adding new abstraction for sequence tagging datasets with new API

[zhangguanheng66]

We also need a docs strings here.

[zhangguanheng66]

LGTM. Add some minor comments in the PR. Let me know when you need a final look before merging. Thanks a lot.

[akurniawan]

@zhangguanheng66 have already fixed all the comments. though for the codecoverage not really sure what can be added to improve the coverage, please let me know if you have any ideas

[zhangguanheng66]

I just merged the testcase PR #822

[zhangguanheng66]

@seemethere Any ideas about the codecov failure?

[seemethere]

No idea, I can't view the codecov either

[zhangguanheng66]

No idea, I can't view the codecov either

@seemethere I add a PR to remove codecov and this is consistent with the other two domain libraries. #832

[akurniawan]

@zhangguanheng66 thanks, the unittest have been updated with the latest patch

[codecov]

Codecov Report

Merging #805 into master will increase coverage by 0.41%.
The diff coverage is 85.60%.

@@            Coverage Diff             @@
##           master     #805      +/-   ##
==========================================
+ Coverage   76.57%   76.99%   +0.41%     
==========================================
  Files          40       42       +2     
  Lines        2715     2847     +132     
==========================================
+ Hits         2079     2192     +113     
- Misses        636      655      +19     

Impacted Files	Coverage Δ
...orchtext/experimental/datasets/sequence_tagging.py	77.41% <77.41%> (ø)
...text/experimental/datasets/raw/sequence_tagging.py	92.64% <92.64%> (ø)
torchtext/experimental/datasets/__init__.py	100.00% <100.00%> (ø)
torchtext/experimental/datasets/raw/__init__.py	100.00% <100.00%> (ø)

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[akurniawan]

@zhangguanheng66 done merging #832, thanks for the fix!

[zhangguanheng66]

@akurniawan Thanks for the contribution.