fix native layer concat bug.

[wanghan-iapcm]

add UT testing all input and output shapes

[njzjz]

What is the expected input shape?

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (c4b7baa) 75.86% compared to head (449e7cc) 75.87%.

Additional details and impacted files

@@           Coverage Diff           @@
##            devel    #3112   +/-   ##
=======================================
  Coverage   75.86%   75.87%           
=======================================
  Files         247      247           
  Lines       25117    25117           
  Branches     1598     1598           
=======================================
+ Hits        19055    19057    +2     
+ Misses       5123     5121    -2     
  Partials      939      939           

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[wanghan-iapcm]

What is the expected input shape?

only the last dimension of the input is changed by the mlp. Do we add test of higher dimensional input like [xxx, yyy, ninp]?

[wanghan-iapcm]

What is the expected input shape?

only the last dimension of the input is changed by the mlp. Do we add test of higher dimensional input like [xxx, yyy, ninp]?

done