modified python file and add the udel query for round 5

[lukuang]

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[codecov]

Codecov Report

Merging #1331 into master will increase coverage by 0.17%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master    #1331      +/-   ##
============================================
+ Coverage     51.59%   51.76%   +0.17%     
- Complexity      796      803       +7     
============================================
  Files           154      154              
  Lines          8592     8592              
  Branches       1217     1217              
============================================
+ Hits           4433     4448      +15     
+ Misses         3790     3776      -14     
+ Partials        369      368       -1     

Impacted Files	Coverage Δ	Complexity Δ
...anserini/ltr/feature/base/PMIFeatureExtractor.java	86.53% <0.00%> (+1.92%)	13.00% <0.00%> (+1.00%)
...java/io/anserini/ltr/feature/CountBigramPairs.java	83.11% <0.00%> (+18.18%)	29.00% <0.00%> (+6.00%)

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