Basic WebGL Backend

* Support dump ir for each pass(#693)

* expose DumpIR

* fix comments

* fix comments

* fix upsampling output shape

* simplify expr in get_const_tuple

* Add Mali target support to tvm.target.create

* Add Mali target support in codegen

The type of parameter options should be a str list.

* add basic x86 schedules

* parallelize & vectorize batchnorm + relu

* fuse conv into bn + relu

* move rc loop to outer

* add nhwc conv

* change weight layout to hwcf

* conv + bn + relu fusion for nhwc conv

* fix conv_nhwc schedule when no fusion

* clean up default parallel schedules

* simplify elemwise parallel

* fix elemwise parallel for batch == 1

* update nhwc conv test

* fix and add comment

* fix lint

* remove redundant import

* remove default multithreading for some ops

* remove default multithreading for global pool

* add schedule for ARM Mali GPU

* fix lint

* fix lint

* support more argument type in depthwise_conv2d

* mark all pointer as 'restrict' & fix vector conversion for opencl

try to fix

fix

* [LLVM] Enable same target option in JITModule

* not set mcpu explicitly

* add upsampling cpu op

* add upsampling gpu schedule

* add doc for upsampling op

add more doc

* cleanup upsampling test

* add doc

* fix lint

* fix lint

* fix lint

* remove unused import

* remove skimage dependency

* remove skimage import

* remove schedule_upsampling

* small fixs on docs

* add IR output after parallelization

* [PASS] Improve loop partition to remove un-necessary warning.

* fix comment

* Improve opt_gemm tutorial

* Addressed comments

* [PASS] StorageRewrite Fold Inplace op storage when possible

* update comment to fix typos

* [SCHEDULE]enable partition const loop with build flag (#719)

    * enable partition loop with build flag

    * add a testcase, and modify LoopPartition related cases

*     * add document for split_const_loop

* [IRbuild]Support automatically Name Loop Variable in IRBuilder (#719)

    * add idx_num in class

* using typical index [i, j, k] first, then i_suffix

* keep inputs names

* fix lint

* improve comment of name

* fix lint

* [SCHEDULE]Improve bound deduce for loop partition (#743)

    * add divided checking when deducing

    * related testcase

* fix

* * transform LE and GE first
* remove is_equal
* modify testcase for edge cases checking

* * fix comment

* * fix lint

* * apply transformation form LT -> LE, GT -> GE

* * fix lint

* simplify code and testcase

* add negative co-efficient case

* More complicated cases

* add testcase

* simplify testcase

* comment case for now

* fix testcase

* [CODEGEN] use charp for voidp

* fx

* rocblas integration

* fix include

* fix lint

* modified schedule_dataflow_rewrite.cc to fix losing tensor problem

* modified schedule_dataflow_rewrite.cc for lint scan

* modified schedule_dataflow_rewrite.cc for lint scan

* using tensor's value_index to index output of stage op

* [CODEGEN] update codegen for vector operation

* update comment, fix for metal

* fix some bugs in codegen

* use 'restrict' in every argument

* fix

* fix

* add cublas support

* integrate cublas to topi dense

* add cublas error check

* minor fix

* fix lint

* remove topi import from contrib unittest

* [SCHEDULE]enable partition const loop with build flag (#719)

    * enable partition loop with build flag

    * add a testcase, and modify LoopPartition related cases

*     * add document for split_const_loop

* [IRbuild]Support automatically Name Loop Variable in IRBuilder (#719)

    * add idx_num in class

* using typical index [i, j, k] first, then i_suffix

* keep inputs names

* fix lint

* improve comment of name

* fix lint

* [SCHEDULE]enable partition const loop with build flag (#719)

    * enable partition loop with build flag

    * add a testcase, and modify LoopPartition related cases

*     * add document for split_const_loop

* use cudnn findalgo to choose the best algo

* fix lint

* when there is no intrin func, using body for initialization. For issue 714.

* Refine code per review comments, and add a test case.

* Fix lint issues.

* Re-organize the tensorize test cases, and add a new case for none-reset
mode.

* Fix a typo.

* Delete the unit case because merged it into test_schedule_tensorize.py already.

* when there is no intrin func, using body for initialization. For issue 714.

* Refine code per review comments, and add a test case.

* Fix lint issues.

* support dim-0 tensor in topi ops

revert transform

* revert

* add target.libs to target str representation

* integrate cudnn into topi cuda

* append target.libs to target.options

* add extern schedule for miopen

* fix comment

* optionally dispatch to miopen from topi

* fix lint

* check if current target is None

* use generic dispatch for rocm conv2d

* fix lint

* fix workspace bug

* remove blank line

* remove blank line

* remove blank line

* add x86_64 target

* add binary dense operator

* rebase

* improve schedule

* remove x86 target

* improve schedule

* fist working miopen support

* do FindFwdAlgo during build time

* fix lint

* update doc string

* import topi after checking if rocm is enabled

* add miopen namespace

* fixed descriptor overwrite bug

* add use_miopen option

* fix lint

* better miopen option handling

* fix typo

* fix options handling