Binary mode for test files

Added import

Reading in binary mode

Used BytesIO

Binary mode for zip

Binary mode in tests

FLAKE8

Added test pkl_utils into flake8 whitelist

Refactored pkl tools and tests

Removed test_pkl_utils from flake whitelist

Use doctest to update pydotprint plots and debugprint output

Average pool CPU with python code

[CRASH] Make MaxAndArgmax support NoneConst as axis.

[TESTS] Fix crash in tests in debugmode and small optimizations.

Merge conv2

Added doc for strict flag.

Small doc fix gh-2793

Change cache refresh patter for speed up

Better error message when missing dimension in initial value in Scan

[TEST, BUILDBOT] Update tests since new optimization

Fix crash on Mac with curand op. We where using g++ extention that MSVC ...

[CRASH] Scan segfault with inconsistent inner graphs

[CRASH] Fix crash in save_mem when directly using outputs of the scan node