Update inline comments for cifar_distributed_cnn resnet_cifar10

[KimballCai]

Update inline comments for cifar_distributed_cnn resnet_cifar10

[codecov[bot]]

Codecov Report

Merging #996 (b1a8f2e) into dev (a391afe) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##              dev     #996   +/-   ##
=======================================
  Coverage   68.41%   68.41%           
=======================================
  Files          99       99           
  Lines       11466    11466           
=======================================
  Hits         7845     7845           
  Misses       3621     3621           

Flag	Coverage Δ
singa-cpp	60.74% <ø> (ø)
singa-python	73.42% <ø> (ø)

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