dtype of count is the same as dtype of inputs[0] when created, but its type may
  change when multiplied by inputs[0]->shape[i]. Which causes dtype of
  output is not same as dtype of input.

* [COMPILER][BUG] Fix out of bound access.

* 	* Review comments.

* 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

* Improve x86 pooling and concat

* Fix

* Fix test concatenate correct layout

* Add conditional vectorize

* Fix lint

* Modify schedule for global pooling

* Fix

* Fix warning

* Fix alter layout test

* Remove vectorization for pooling when using 4D layout

* Remove vectorization for 4D concat

* Fix concatenate layout

* Fix concatenate schedule

* Fix concat

* Fix lint

* Fix concat

* Simplify pooling logic

* Update docstring

* Fix test topi pooling

* Small changes

[NNVM][TOP] broadcast versions corresponding to topi: mod, max, min, pow, left_shift, right_shift greater, less, equal, not_equal, greater_equal and less_equal. (#1383)