Fixing build_targets in SetCriterion

[zhiqwang]

Fixing #60

[codecov]

Codecov Report

Merging #143 (609399f) into master (cc2bd50) will increase coverage by 0.78%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #143      +/-   ##
==========================================
+ Coverage   83.44%   84.22%   +0.78%     
==========================================
  Files          12       12              
  Lines         761      748      -13     
==========================================
- Hits          635      630       -5     
+ Misses        126      118       -8     

Flag	Coverage Δ
unittests	84.22% <100.00%> (+0.78%)	⬆️

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Impacted Files	Coverage Δ
test/test_engine.py	100.00% <ø> (+5.67%)	⬆️
test/test_models_utils.py	100.00% <ø> (ø)
test/test_models.py	100.00% <100.00%> (ø)

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