Merge pull request !816 from TonyNG/master

fix UT

del unused arguments

fix UT

explainer_api UT change to pytest style

fix UT url

explainer encapsulator UT change to pytest style

remove unnecessary deepcopy

remove import copy

fix some coding style issues

modification for parser

modification for parser with containers

fix bugs for parser

fix value vacancy for parser

fix typos for parser

adaptation for proto modification

rearrange image data from events

fix small typo

add comments and some error message

delete example

modify init setting of parser

modify some structure of parser

fix pylint warnings

modify parser for parsing one event every time

modify for review

add some comments

modify proto file

modify for open source comments