relax the error constraints on these tests due to likely
FP compuation accuracy issues.

* add Pad,ReduceMax,ReduceMin,ReduceMean,ReduceSum for onnx frontend

* fixed pylint error and warning for frontend.onnx file

* add implement v2 for Pad in onnx frontend

* compatible with python 3.x

* disable too-many-lines pylint check in frontend onnx

* use random values instead in onnx frontend testing

* Rename axis parameter in onnx squeeze

* Add test

* LRN support for ONNX

* [ONNX] Updated lrn testcases

[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)

* add more op for onnx 1.0

* fix syntax

* fix lint

* fix

* update 1.0

* fix

* update model

* update

* fix

* use generated onnx model

* fix tests

* fix lint

* remove log filter

* add vgg

* fix tests

* update tests

* fix download

* fix ci

* fix tutorial url

* clean cache

* Change the way to import ONNX model.

* Decide ONNX version and change the processing

* Check whether onnx has the attribute '__version__'

* init onnx

finish onnx frontend

add onnx tests

fix various

backup

use transformer

[Frontend] graph passed

add test forward

test forward

fix doc and lint

fix test graph tuple

from_onnx now take 2 args, output (sym, params)

fix rename

fix input names

fix multiple

fix lint

fix lint check

* better doc