* initial commit

* add python frontend and module tests

* add unit tests for function pass and optimize interface

* add ExprPass

* remove PassState and pass context for run

* add required_passes

* return module

* remove move

* fix minor reviews

* remove optimizer, optimizer->pass_manager, make pass a the base class of all

* remove deleted files

* move resolvedependency to sequential pass, use ir_pass namespace

* add todo

* add disabled passes in sequetialpass

* fix minor

* fix currying doc

* remove pass_kind from passnode

* remove pass kind from test

* fix doc

* fix per @tqchen's comments

* remove pass_manager.py create separate classes

* simplify pass_func

* inline using passfunc

* update doc

* disable test_quantize_pass for now

* create PassInfo class to contain the meta data

* flatten passinfo for interface

* retrigger ci

* remove required method

* make Pass python class lighter

* create pass -> decorator

* make the api consistent for all classes

* [relay][frontend] TensorFlow saved model support

* Add Examples section

* keep one copy of tensorflow_parser in relay

* tile and repeat operator added in rely

* fix pylint

* fix make warnings

* comments addressed

* fix lint error

* comment addressed

* [Relay][Quantization] Speed-aware quantization scheme improvement

* Add comment

* Add use_stop_fusion to qconfig

* Update comment

* Improve NNVM to Relay conversion

* fix pylint

* support __lshift_scalar__, abs, ceil, floor, and trunc to pass CI

* Fix bug in mxnet converter for slick_like

* More tolerance for topi_conv2d_NCHWc

* add stack op frontend

* concate moved

* topi stack added

* stack added

* fix stack bugs and tested

* conv2d alterlayout udpated for relay

* fix pylint

* fix cmake warnings

* cmake warnings fixed

* bug fix

* trigger ci

* [RELAY][OP] Proposal

* Fix

* Fix test

* use LLVM linker

* error message improved in case of filenotfound

* linting error fixed

add test

remove dead code

stash

do it

add more test