1. description of num_shard in datasets.py
2. add param validation for sampler
3. add description for add_child in sampler.py

From: @wangshuide2020
Reviewed-by: @liangchenghui,@wuxuejian
Signed-off-by: @liangchenghui

From: @ngtony
Reviewed-by: 
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From: @changzherui
Reviewed-by: @guoqi1024,@kingxian
Signed-off-by: @guoqi1024

From: @xsmq
Reviewed-by: @kisnwang,@zhoufeng54
Signed-off-by: @zhoufeng54

From: @jiangzg001
Reviewed-by: @liangchenghui
Signed-off-by: @liangchenghui

From: @lihongkang1
Reviewed-by: @liangchenghui,@ljl0711
Signed-off-by: @liangchenghui

From: @sunsuodong
Reviewed-by: @xsmq,@zhoufeng54
Signed-off-by: @xsmq

From: @TFbunny
Reviewed-by: 
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From: @qujianwei
Reviewed-by: 
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From: @david-he91
Reviewed-by: 
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From: @wangshuide2020
Reviewed-by: @ljl0711,@liangchenghui
Signed-off-by: @liangchenghui

fix for copyright

fix for create_dataset

fix for some bug

fix for parser_output

fix for parse output

add readme and fix for some bug

fix test2016 to test

delete space

fix some bug for create dataset

fix for comments and overflow

fix a wrong bug

fix for weight init

From: @sunsuodong
Reviewed-by: @HilbertDavid,@xsmq
Signed-off-by: @xsmq

From: @youui
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From: @yanglf1121
Reviewed-by: 
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From: @cathwong
Reviewed-by: @robingrosman,@nsyca
Signed-off-by: @robingrosman

From: @tom__chen
Reviewed-by: 
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From: @luoyang42
Reviewed-by: @robingrosman,@nsyca
Signed-off-by: @robingrosman

From: @zsj_mind
Reviewed-by: @zh_qh,@zhoufeng54
Signed-off-by: @zh_qh

From: @TFbunny
Reviewed-by: @tom__chen,@robingrosman
Signed-off-by: @robingrosman

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

From: @wangdongxu6
Reviewed-by: @ddwsky,@zhanghaibo5
Signed-off-by: @ddwsky

From: @liubuyu
Reviewed-by: @kisnwang,@zhoufeng54
Signed-off-by: @zhoufeng54

From: @jiangzg001
Reviewed-by: @liangchenghui,@linqingke
Signed-off-by: @liangchenghui

From: @yeyunpeng2020
Reviewed-by: 
Signed-off-by:

From: @changzherui
Reviewed-by: @zh_qh,@kingxian
Signed-off-by: @zh_qh

From: @wangshuide2020
Reviewed-by: @liangchenghui,@ljl0711
Signed-off-by: @liangchenghui

From: @jonyguo
Reviewed-by: @pandoublefeng,@heleiwang,@liucunwei
Signed-off-by: @liucunwei

From: @yangzhenzhang
Reviewed-by: @stsuteng,@kisnwang
Signed-off-by: @stsuteng

From: @yangruoqi713
Reviewed-by: @zhang_xue_tong,@zhanghaibo5
Signed-off-by: @zhang_xue_tong

From: @xutianchun
Reviewed-by: @hangangqiang,@HilbertDavid
Signed-off-by: @hangangqiang

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

Signed-off-by: zhushujing <zhushujing@huawei.com>

From: @Somnus2020
Reviewed-by: 
Signed-off-by: