* Add mean and product operators

* Fix typo

* Fix lint

* fix test

* Fix gpu schedule

* Update doc

* remove mean from topi

* Add nnvm test

* Fix cuda schedule

* Remove cuda schedule

* [TOPI] add nn schedulers for HLS backends

* fix pylint

* fix topi transform test

* [CODEGEN][AOCL] Add math intrinsic rules

* introduce aocl_emu target for AOCL emulation

* rename aocl_emu with aocl_sw_emu

* update docs

[NODE] Enable global singleton object, allow set_body_typed in function registry, default fallback of IRPrinter. (#1652)

* Use int for int8x4 due to performance overhead of char4

* Add a comment about using int

* Remove invalid test

* [TOPI] add injective scheduler for HLS backends

* Introduced PrintBinaryExpr