example: update example of lenet-stn

[iblislin]

make its optimizer configured same as Python's

fix #369

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@rickhg12hs Could you checkout it?

[codecov-io]

Codecov Report

Merging #371 into master will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #371   +/-   ##
=======================================
  Coverage   69.74%   69.74%           
=======================================
  Files          25       25           
  Lines        1963     1963           
=======================================
  Hits         1369     1369           
  Misses        594      594

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[iblislin]

Do you have any GPU to try it out? Maybe we can add some note in the example first.

[rickhg12hs]

I have no GPU, sorry.