[example] Yolov5 on Face Mask Detection

[KexinFeng]

Relevant to PR awslabs/atlearn#9 in ATLearn.

[codecov-commenter]

Codecov Report

Patch coverage: 73.92% and project coverage change: +1.81 🎉

Comparison is base (bb5073f) 72.08% compared to head (4def4d5) 73.90%.

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Additional details and impacted files

@@             Coverage Diff              @@
##             master    #2452      +/-   ##
============================================
+ Coverage     72.08%   73.90%   +1.81%     
- Complexity     5126     6804    +1678     
============================================
  Files           473      673     +200     
  Lines         21970    29706    +7736     
  Branches       2351     3066     +715     
============================================
+ Hits          15838    21954    +6116     
- Misses         4925     6262    +1337     
- Partials       1207     1490     +283     

Impacted Files	Coverage Δ
api/src/main/java/ai/djl/modality/cv/Image.java	69.23% <ø> (-4.11%)	⬇️
...rc/main/java/ai/djl/modality/cv/MultiBoxPrior.java	76.00% <ø> (ø)
...rc/main/java/ai/djl/modality/cv/output/Joints.java	71.42% <ø> (ø)
.../main/java/ai/djl/modality/cv/output/Landmark.java	100.00% <ø> (ø)
...main/java/ai/djl/modality/cv/output/Rectangle.java	72.41% <0.00%> (ø)
...i/djl/modality/cv/translator/BigGANTranslator.java	21.42% <0.00%> (-5.24%)	⬇️
.../modality/cv/translator/ImageFeatureExtractor.java	0.00% <0.00%> (ø)
.../ai/djl/modality/cv/translator/YoloTranslator.java	27.77% <0.00%> (+18.95%)	⬆️
...ain/java/ai/djl/modality/cv/util/NDImageUtils.java	67.10% <0.00%> (+7.89%)	⬆️
api/src/main/java/ai/djl/modality/nlp/Decoder.java	63.63% <ø> (ø)
... and 229 more

... and 339 files with indirect coverage changes

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All solved accordingly.