example: add helloworld example - fast, sufficient and light

[tianweidut]

Description

remove pytorch heavy dependency.

• server run:
  
• standalone run:
  
• model build:
  
• dataset build:
  

Modules

• Others

Checklist

• run code format and lint check
• add unit test
• add necessary doc

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (07e6c5b) 82.45% compared to head (2fdc38b) 92.04%.
Report is 4 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #3000      +/-   ##
============================================
+ Coverage     82.45%   92.04%   +9.59%     
============================================
  Files           563      124     -439     
  Lines         30351    14962   -15389     
  Branches       1826        0    -1826     
============================================
- Hits          25026    13772   -11254     
+ Misses         4521     1190    -3331     
+ Partials        804        0     -804     

Flag	Coverage Δ
console	?
controller	?
standalone	92.04% <ø> (+0.10%)	⬆️
unittests	92.04% <ø> (+0.38%)	⬆️

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[goldenxinxing]

LGTM