* Add batch_dot and cpu schedule

* Add relay support for batch_dot

* Rename batch_dot to batch_matmul

* nits

* Add missing file

* Put batch_matmul and dense x86 schedule in separate files

* Fix pylint

* Remove unused import

* Add cuda schedule for batch_matmul

* Add test case with larger batch size

* Add batch_matmul in api doc

* Fix quantize pass rounding error

* Fix pylint and minor change

* bug fix

* move layout.h & layout.cc from relay to tvm

* change ConvertLayout in relay to bijectiveLayout->Forward/backward

* add first test case

* add LayoutAxis

* add LayoutAxis struct and compiles

* simplify BijectiveLayout rule consturct

* polish func name for Layout, move impl to .cc, remove Layout::defined(), add defined() checker

* partially add layout py support

* add layout test cases

* add doc for tvm.layout & tvm.bijective_layout

* fix lint

* fix lint

* fix layout name generation bug

* fix layout typo

* address comments and add topi.layout_transform

* layout.h->data_layout.h, test_lang_layout.py->test_lang_data_layout.py

* alter_op_layout for x86

* cleanup

* cleanup

* fix lint

* fix lint

* fix lint

* fix lint

* change support level

* change other support levels

* [RELAY] Fix ops in packed layout

* Fix style

* Add sptialpack schedule for arm cpu depthwise convolution

* Supply comments.

* [RELAY] Finish alter op pass

* [RELAY] AlterOpLayout Pass

* fix broadcast operators

* fix broadcast operators

* fix broadcast operators

* Support concatenate

* address comments

* address comments

* add comments

* rebase

* [RELAY] BiasAdd, MLP, Resnet testing

* fix review comments

[RELAY][OP] Operators.  	 pool2d, global_pool2d, batch_flatten, tanh, sigmoid, floor, ceil, trunc, abs, negative, multiply, mod, pow,  resize (#1813)