* Make "none" DataType explicit

The None data type is created when converting an empty string to DataType.
Add functions to create it and recognize it. Convert it to the "void" LLVM
type in LLVM codegen.

* Rename "none" to "void"

* Map VoidType:Type -> Void:DataType in GetRuntimeDataType

* Map Void:DataType -> VoidType:Type in GetType

* Prototype for micro TVM.

* Cleanup and sync micro tvm prototype.

* Use /std:c++14 with MSVC.

 * Per tqchen: project has already moved to C++14
 * Presubmit failed for code that built locally on gcc.

* fix ASF lint, and fix add_asf_header too

* Compiles with USE_MICRO=OFF.

* Cleanup TargetPtr and word size representations.

* fix compile warning

* address logan's comments

* address logan and liangfu comments

* address thierry's comments

* address u99127, liangfu, tmoreau89 comments

Co-authored-by: Logan Weber <weberlo@cs.washington.edu>

* add constantnode to atomic

* Add ToANormalForm to FoldConstant

* [VTA] Fix Pynq driver build issue.
Issue:
When doing vta compile in xilinx FPGA, the pynqdriver.cc report can
not find <vta/driver.h>

Solution:
add related path.

* Fix libvta load fail issue.

issue:
run vta on pynq board libvta.so load failed.

solution:
fixed VTA.make logic issue

Allows Optional<NDArray> and module to be passed with the right type code.

Co-authored-by: Zhang Hao <zhanghao@4paradigm.com>

* Bind constant tuples in the graph partitioner

Change-Id: I815b32b5445a536c1837369b04f67dbbb0aed900

* Add partitioning test

Change-Id: I3a492ec8d1beab4830214e3bc8da2a7c80771ca4

* Rename test target

Change-Id: Ie32f37c1395ff597c0047ad3a93ed04ce3f3125d

* [CODEGEN][CUDA] Fix a bug when vectorized load&store was involved for "char2"

* Add unittest for char2

* vector element load support char2&add some unittest for vector element load

* Merge common up logic&Support char3&Add unittest for char3

This patch ensures that the output shape from TVM's
Detection_PostProcess is the same as TFLite's and
expands the unit test to confirm this.

Change-Id: If5db95741533f131241dfebbaa7708dbd528fe70

* tflite spliv ops

* TFLITE fill and splitv ops

* TFLITE fill and splitv ops

* TFLITE fill and splitv ops

* remove unnecessary operator check

* TFLITE fill and splitv ops

* l2_pool_2d op changes in comment

* TFLite l2_pool_2d op added test case in main

* TFLite L2_POOL_2D added check for quantized input

on top of another image to be used as reference.

* Optimizations of global_ave_pool for NHWC layout

* Optimize the code format to pass inspection of pylint

Co-authored-by: Shawn-Inspur <wushaohua@inspur.com>

* Add operation relay.nn.dilate() which calls topi.nn.dilate().

* Fix typo

* Set op pattern to injective

* [RELAY] Move frontend utils

The util file currently under frontend is used from
outside of frontend (in qnn/op/legalizations). This suggests
that the file should be pushed up to a higher level.

The benefit from this change is that importing qnn no longer
also imports all the frontends.

* Inline get_scalar_from_constant

Change-Id: I1cc64e9ecb0eadb6ac0f7b62e6ea174644af4ad4

* Remove util.py from Relay

Change-Id: If9cd7cf3fc0bd1861a3a9b5604f338e084d8db96

* Shorten functions

Change-Id: Ieb537d82e6ee52421ff05a90cd00a03679ffebf2

* Line length

Change-Id: I1d216b7e73a060c4f118f5da50ce58b18eba907f

- remove unnecessary white spaces from storage kind
- do not start a new scope for vectorization as temporary
  variables are alll uniquely generated.

The above two changes make vectorized code much cleaner.

Signed-off-by: Wei Pan <weip@nvidia.com>

* Add TopK to ONNX Frontend

* respond to review comments

* [RELAY][PYTORCH]cosh,sinh,log2,log10,log1p op support

* Review comment fixed

* Gradient testcase added

The _type_child_slots can be used to enable quick type checking optimization
by checking the whether the type index is within the bound.

This PR enables these static slots:

- Introduce a static assert to avoid the scenario when a developer forget to
  _type_child_slots when the field is set for the type's parent.
- Revamp and assign static type index to common runtime objects
- Add a DumpTypeTable call to allow developer monitor the current situation
  of type table and offers suggestions for the slots(ideally the slots equals
  the number of children so there is no overflow.

Added missing "tir" in tvm.tir.analysis.verify_gpu_code(f, kwargs)

* [FRONTEND][TFLITE]Gather, StridedSlice op added

* Review comments fixed

* [PYTORCH]Where, addcdiv, addcmul op support

* Review comments fixed

To make runtime.String to work as naturally as possible in the python side,
we make it sub-class the python's str object. Note that however, we cannot
sub-class Object at the same time due to python's type layout constraint.

We introduce a PyNativeObject class to handle this kind of object sub-classing
and updated the FFI to handle PyNativeObject classes.