From: @ngtony
Reviewed-by: 
Signed-off-by:

fix pylint issues

deepcopy model inside uncertatiny instance

update summary.proto for hoc and uncertainty

update summary.proto tab to spaces

enhance code by review comments

fix comment format

add uncertainty and saliency cross registration checking.

check registered with is none

group constants togather, enhance runner data checking

update copyright year

enhance comment wordings

This commit provides APIs for user to use the widely used attribution methods to explain DL models and the evaluation methods to quantify the explanations. With combination of MindInsight, the user can have a friendly visualization on their models.