remove self.logger

[senwu]

Description of the problems or issues

Is your pull request related to a problem? Please describe. Some code use self.logger which is not expected.

Description of the proposed changes

Use global logger for each python file if needed.

Test plan

No test needed.

Checklist

• [ ] I have updated the documentation accordingly.
• [ ] I have added tests to cover my changes.
• [ ] All new and existing tests passed.
• [ ] I have updated the CHANGELOG.rst accordingly.

[codecov-commenter]

Codecov Report

Merging #462 into master will increase coverage by 0.04%. The diff coverage is 40.00%.

@@            Coverage Diff             @@
##           master     #462      +/-   ##
==========================================
+ Coverage   83.28%   83.32%   +0.04%     
==========================================
  Files          88       88              
  Lines        4564     4563       -1     
  Branches      837      837              
==========================================
+ Hits         3801     3802       +1     
+ Misses        572      571       -1     
+ Partials      191      190       -1     

Flag	Coverage Δ
#unittests	83.32% <40.00%> (+0.04%)	:arrow_up:

Impacted Files	Coverage Δ
src/fonduer/parser/visual_linker.py	84.18% <23.07%> (ø)
src/fonduer/parser/lingual_parser/spacy_parser.py	81.81% <33.33%> (-0.11%)	:arrow_down:
src/fonduer/utils/udf.py	88.67% <83.33%> (ø)
src/fonduer/candidates/models/span_mention.py	76.63% <0.00%> (+1.86%)	:arrow_up: