[CI] Fix Source Reference Issues

[barry-jin]

Description

As title.

Checklist

Essentials

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

Codecov Report

Merging #1332 into master will increase coverage by 0.20%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1332      +/-   ##
==========================================
+ Coverage   84.25%   84.45%   +0.20%     
==========================================
  Files          42       42              
  Lines        6426     6426              
==========================================
+ Hits         5414     5427      +13     
+ Misses       1012      999      -13     

Impacted Files	Coverage Δ
src/gluonnlp/utils/misc.py	52.53% <0.00%> (-0.32%)	:arrow_down:
src/gluonnlp/data/loading.py	83.39% <0.00%> (+5.28%)	:arrow_up:

---

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 66e5e05...25af487. Read the comment docs.