[fix] fix a bug of trainer/argparser.py

[greycooker]

PR types

Bug Fix

PR changes

fix a bug of trainer/argparser.py

Description

modify the Trainer class's parse_json_file_and_cmd_lines function in order to correctly handle list-format parameters in a JSON file, which are currently can not parse correctly.

[paddle-bot]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (48c1313) 56.91% compared to head (d02af23) 56.90%.
Report is 1 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #7860      +/-   ##
===========================================
- Coverage    56.91%   56.90%   -0.01%     
===========================================
  Files          587      587              
  Lines        88740    88742       +2     
===========================================
- Hits         50502    50500       -2     
- Misses       38238    38242       +4     

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