* [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

* [LIBINFO] Enable load .dylib on darwin

* Fix makefile

* [ATTR/SYMBOL] Expose op_name attr to python

* fix xcode

* fixed make no_optimization runs indefinitely when run the memcost example provided

* format plan_memory.cc

* fix plan memory add inplace_identity option

* comment

* Handling duplicate NodeEntries on the edge of the graph

* Fix docs and segfault

* Suggestions from review

* Added attr_parser check