(cherry picked from commit f6be4d69)

(cherry picked from commit 66cd036e)

(cherry picked from commit c7165427)

* Version 0.5

* update version.py

* update news

* update news

* update news

* update titles to reflect tutorial content (nnvm vs. relay)

* move things around

* fix typo

* fix storage_rewrite bug when input is big

* cast when necessary

* simplification

* simplification

* int64->uint32

* revert uint32->int64

* [TOPI][CUDA] Add faster-rcnn proposal op

* Fix doc

* Add global barrier

* Use vthread in argsort

* Update sort and nms ir

* Fix lint

* Update sort ir in ssd nms

* a preliminary version is done?

* we no longer need the redundant hybrid/api.py

* support assert stmt

* cast supported

* intrin -> runtime; util is mainly in charge of compilation time

* assert statement

* fix python lint

* fix cpp lint

* on the way to module

* rollback .cc

* fix typo, no direct expose then

* @vinx13 ceil is added i guess?

* wip...

* temp commit

* fix import

* i preliminary version is done?

* on the way to build hybrid module

* nearly fixed...

* dumped python are equiv as original python

* on the way to bootstrap

* cpu bootstrap done

* bootstrap!

* fix lint

* fix doc

* resolve some review concerns

* support load/save

* fix lint

* thanks to xqdan fixed my typo

* fix build, make dump non-optional

* add vthread

* jesus why i added this

thanks @icemelon9, this is merged

Remove exception trail in tf parser error message

Fix lint

Fix comments

TF parser: return the consistent error message to error handler

Optimize move semantics of NodeEntry reducing copies of shared_ptr which causes atomic contention (#2576)

* [TVM][BUGFIX] Fix reductions in split axes

* A test case for the problem

* Fix the fix: skip loops that are related to reduction AND are unrelated to axis

* [RELAY][FRONTEND] Tensorflow frontend support.

* 	* LSTM removed for a while.

* 	* basic ops are good.

* 	* nn wip

* 	* wip

* 	* python2.7 corrections.

* * NN ops are good.

* * e2e models working good

* 	* all good except LSTM

* 	* rebase, tutorials and CI trigger.

* 	* CI errors.

* 	* enable opt_level=3

* 	* Docstrings cleanup. testing.tf utils moved to relay from nnvm.

* 	* tutorials update.

* 	* LSTM work good now.

* 	* Rebase

* 	* CI error

* 	* enable PTB.

* 	* rebase.

* 	* tutorials

* Update python/tvm/relay/frontend/tensorflow.py

Co-Authored-By: srkreddy1238 <sivar.b@huawei.com>

* 	* review comments.

* 	CI fix.

* 	* review comments.

* Enable reverse in reshape

* Fix lint and typo

* Put reverse_reshape into a separate op

* Fix pylint

* [Relay][Frontend] Add Caffe2 Support

* [Relay][Frontend] Add Caffe2 Support (fix unsed import)

* [Relay][Frontend] Add Caffe2 Support (fix caffe2 model import)

* [Relay][Frontend] Add Caffe2 Support (fix model install and reflect code reviews)

* [Relay][Frontend] Add Caffe2 Support (fix caffe2 model import)

* [Relay][Frontend] Add Caffe2 Support (fix caffe2 model import)

* [Relay][Frontend] Add Caffe2 Support (fix caffe2 model import)

* [Relay][Frontend] Add Caffe2 Support (fix caffe2 frontend import)

* [Relay][Frontend] Add Caffe2 Support (rename function name in test_forward)

* [Relay][Frontend] Add Caffe2 Support (fix caffe2 model import)

* [Relay][Frontend] Add Caffe2 Support (fix caffe2 model import)

* [Doc] Caffe2 frontend tutorial

* [Doc] Caffe2 frontend tutorial

* [Doc] Caffe2 frontend tutorial

* [Relay][Frontend] Add Caffe2 Support (remove unsed file)

* [COMMUNITY] @FrozenGene -> Reviewer

* Fix