* register pool, global_pool; add mobilenet example

* tests of pool and global_pool

* use new API of runtime module

* small fix

graph

backup

update

finish mxnet converter

fix

fix various

add tests

fix

add multi networks

uses model_zoo

fix tests

minor fix

fix graph

fix

* [TOP] Add dense, batchnorm

* update tvm

* [RUNTIME][COMPILER] Formal compiler pipeline, runtime wrapper module

* more detailed comments

* register depthconv, elemwise

* use global elemwise schedule for relu

* [PASS] PrecomputePrune, add testcase

* update comment

* [TOP] level4 except argmax/min, correct split

* [DOCS] Add doc generator for top

* [TOP] complete level2

* [TOP] add split

* improve infer shape/type error message

* fix dense infer shape

* Address execution hot spots

* extend the reserve logic a bit

* FIx more hot spots

* Performance: use resize(0) instead of clear() in order to avoid a free/malloc

* declare a type name for each tuple type

* generic way to declare type names for each tuple type

* fix lint error

* update submodule dmlc-core

* add additional field into node for autograd

* check inputs reachable

* fix