* 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

* Change TShape::index_t to int64_t

* Add comment

* Make Tuple::Save&Load dtype generic

* trigger update

* Fix lint

* Fix comment

* Change index_t to dim_t

* Remove legacy index_t

* CMake/make adjustments and warning fix

* Fix warnings

* change to match by both op and name

* add zero prop for non differentiable ops

* Update infer_shape_type.cc

* enable shape hints during infer_shape pass

* fix comment

* Imbalance version of shared pool during plan memory

* Bug fix for no shared_pool case

* Auto search and updated shared mem pool

* Cleanup unused code

* Cleanup logging code

* Add unit test for shared storage

* Remove shared pool in PlanMemory. Fix lint warnings

* Fix lint warnings

* Use reference instead of ptrs