Support to stop the loader that is currently loading data when add a new loader to cache by get_job method
Add the UT usecase to the stop mechanism

bugfix and add pillow to requirements.txt

modify summary format

bugfix

use sample_id in summary

fix CI problem

url encode '/' as well

fix ut

fix ut

fix ut

fix uncertainty enable checking

fix review comment

enhance exception raising

enhance comment

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