* on the way to enable hybrid schedule

* I think I am done with imperfect loop split?

* copyright watermark

* loop annotation

* fix lint

* fix lint 1

* shit!

* loop reorder supported

* support bind to add some tests

* fused tested

* imperfect loop testcase

* fix lint

* add bind testcase

* fix doc

* fix online edit typo

* resolve @mercymercy review

* fix indent

* i should convince myself it is not flaky test first

* fix test hybrid

* how many flaky test are you expecting; i ball ball u to let me pass

* rebase halide...

* init

staging on

final save before staging

save

init ver

init ver

ll stuff

save

add failing test

add file

pass test

fix error

huh?

save

Add test changes

Fix fusion with nested tuples

Fix reverse mode test

More hacking

Clean up AD

Hacking on reverse mode

Fix issue in reverse

save

fix lint

fix lint

fix lint

save

save

fix

support neg

address some comment

add back file

save

save

* save

* save

* save

* lint

* fix lint

* save

* fix

* Add GEMM autotvm template for x86

* Fix tophub link

* Disable RPC server logging file delete

* Update dense autotvm template

* Fix tests

* Fix lint

* tweak

* Register two templates with different tags

* Add sptialpack schedule for arm cpu depthwise convolution

* Supply comments.

Add trace call expr to allow trace Tensor data
at the runtime. By default the default handler
is enabled which prints a tracing data to stdout,
otherwise user should specify a call_back as
global_function (aka @tvm.register_func).

The issue is related to:
https://discuss.tvm.ai/t/idea-trace-expression/945

* Enhanced simplification rules for Div by a positive constant

* Fixed my last commit to correctly interpret TVM's division as truncated division

* Fixed implemenation of IntSet::can_prove_non_positive()

* addressed comments by @yzhliu

* addressed comments by @sgrechanik-h

* addressed more comments by @yzhliu

* Fix clock type in rpc_session timer

* Fix lint error

* Add cast op
* Rename dtype_cast to cast
* Add additional safety check for String2TVMType
* Add missing relay op docs

* Add MXNet test example for relay
* Fix a bug in BiasAddSimplifier

* [PASS] Avoid recursion in FoldScaleAxis

* remove GetForwardScale