[BUGFIX] fix DKT

[sone47]

Thanks for sending a pull request! Please make sure you click the link above to view the contribution guidelines, then fill out the blanks below.

Description

(Brief description on what this PR is about)

What does this implement/fix? Explain your changes.

...

Pull request type

• [ ] [DATASET] Add a new dataset
• [x] [BUGFIX] Bugfix
• [ ] [FEATURE] New feature (non-breaking change which adds functionality)
• [ ] [BREAKING] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [ ] [STYLE] Code style update (formatting, renaming)
• [ ] [REFACTOR] Refactoring (no functional changes, no api changes)
• [ ] [BUILD] Build related changes
• [ ] [DOC] Documentation content changes
• [ ] [Sync] Synchronization with a repository
• [ ] [OTHER] Other (please describe):

Changes

• Fix1, add mask to DKT
• Fix2, drop the row if skill id is nan rather than set it to 0
• Fix3, change the padding of one-hot

Does this close any currently open issues?

N/A

Any relevant logs, error output, etc?

N/A

Checklist

Before you submit a pull request, please make sure you have to following:

Essentials

• [x] PR's title starts with a category (e.g. [BUGFIX], [FEATURE], [BREAKING], [DOC], etc)
• [x] Changes are complete (i.e. I finished coding on this PR)
• [x] All changes have test coverage and al tests passing
• [x] Code is well-documented (extended the README / documentation, if necessary)
• [x] If this PR is your first one, add your name and github account to AUTHORS.md

Comments

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

[codecov-commenter]

Codecov Report

Merging #5 (26b9c8c) into main (a6cdfae) will not change coverage. The diff coverage is 100.00%.

@@            Coverage Diff            @@
##              main        #5   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           15        15           
  Lines          387       388    +1     
=========================================
+ Hits           387       388    +1     

Impacted Files	Coverage Δ
EduKTM/DKT/DKT.py	100.00% <100.00%> (ø)

---

Continue to review full report at Codecov.

Legend - Click here to learn more Δ = absolute <relative> (impact), ø = not affected, ? = missing data Powered by Codecov. Last update a6cdfae...26b9c8c. Read the comment docs.