transform valuetuple to maketuple of graphs

add testcase

Merge pull request !967 from panyifeng/switch_case_primitive

Merge pull request !1011 from ghzl/improve-comment-enable-dump-context

Merge pull request !901 from rick_sanchez/master

Merge pull request !1018 from JichenZhao/globalbn_reshape_fix

Merge pull request !1020 from yoonlee666/master-readme

ImageGradients make compile check before others

Merge pull request !958 from yangzhenzhang/add_parallel_mode_for_cell

Merge pull request !987 from yangruoqi713/master

Merge pull request !984 from Tinazhang/hwc2chw

Merge pull request !1019 from cathwong/ckw_dataset_ut_cleanup2

Merge pull request !983 from Jamie/colmaps

clang format updates

self-review cleanups

cpplint fix

review updates

ci fixes

Merge pull request !998 from guozhijian/enhance_format_func_name

Merge pull request !1010 from wukesong/remove_datasetlink

Merge pull request !1007 from chengxb7532/master

Merge pull request !1008 from liyanliu96/master

Merge pull request !993 from huanghui/mul-add-fusion-pass-enhancement

Merge pull request !1009 from zhaozhenlong/adapt-lamb-next-mv-ir-fusion

Merge pull request !980 from guozhijian/add_example_for_aclImdb

Merge pull request !1002 from meixiaowei/master

Merge pull request !989 from kisnwang/fix-assignc-ir-inconsistency

Merge pull request !986 from chengxb7532/master

Merge pull request !992 from amongo/fixCodex0508