Fixed class variable for LinearGaussianCPDs

[theUltraMarine19]

Your checklist for this pull request

Fixes

Fixes Issue #961

Changes

• Replaced variables with self.variables in init method of LinearGaussianCPD.py

Thank you!

[codecov]

Codecov Report

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@@          Coverage Diff           @@
##             dev     #962   +/-   ##
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  Coverage       ?   94.72%           
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  Files          ?      114           
  Lines          ?    11201           
  Branches       ?        0           
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  Hits           ?    10610           
  Misses         ?      591           
  Partials       ?        0

Impacted Files	Coverage Δ
pgmpy/factors/continuous/LinearGaussianCPD.py	31.03% <0%> (ø)

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[ankurankan]

@Arijit-hydrated Thanks for the PR. Could you please also add a test case which would fail on the current version ? And after adding that, please squash both the commits into a single commit using git rebase. And please do try to follow: http://tbaggery.com/2008/04/19/a-note-about-git-commit-messages.html for commit messages.

[theUltraMarine19]

@ankurankan Do you want me to add the test case which fails on the current version in the Fixes section above, where I referenced the relevant issue?

Thanks :)

[ankurankan]

@Arijit-hydrated No, we have unittests for the whole codebase (look into pgmpy/tests dir). So, I would like to have a tests added there for this specific issue. Let me know if something's not clear.

[theUltraMarine19]

@ankurankan This is the pull request for the issue #961 which is on high priority now. I noticed this was never merged. Can you elaborate what you want added in the unittests directory?

[ankurankan]

@theUltraMarine19 Just a simple unit test which fails with the current code and gets fixed after merging the PR.