Merge pull request !2030 from lichun/master

Merge pull request !1975 from wangzhengjun/single_op_null_tensor

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

Merge pull request !1856 from 陈华/opt_info

Merge pull request !1884 from HW_KK/huya

From: @HW_KK
Reviewed-by: @xchu42,@wqtshg
Signed-off-by: @wqtshg

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

From: @chen-hua-baker
Reviewed-by: @wqtshg,@ji_chen
Signed-off-by: @ji_chen

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

From: @jiming6
Reviewed-by: 
Signed-off-by:

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

From: @dimitri_rose
Reviewed-by: @zhangxiaokun9
Signed-off-by:

From: @zhou_lili
Reviewed-by: @youui,@wqtshg
Signed-off-by:

From: @HW_KK
Reviewed-by: @youui,@ji_chen
Signed-off-by: @youui

From: @chen_yemeng
Reviewed-by: @sheng-nan,@ji_chen
Signed-off-by: