Temporary fix due to missing PILLOW_VERSION symbol when using torchvision

[jantonguirao]

Signed-off-by: Joaquin Anton janton@nvidia.com

Why we need this PR?

Pick one, remove the rest

• It fixes a bug caused by a deprecated symbol in pillow PILLOW_VERSION while importing torchvision
  https://pillow.readthedocs.io/en/stable/releasenotes/7.0.0.html

What happened in this PR?

Fill relevant points, put NA otherwise. Replace anything inside []

• What solution was applied:
  Fixed pillow version to 6.2.2 (the symbol was removed in the next version 7.0.0)
• Affected modules and functionalities:
  QA test scripts
• Key points relevant for the review:
  Everything
• Validation and testing:
  CI
• Documentation (including examples):
  N/A

JIRA TASK: [Use DALI-XXXX or NA]

[jantonguirao]

!build

[dali-automaton]

CI MESSAGE: [1056003]: BUILD STARTED

[hugovk]

The torchvision fix is due out early next week (pytorch/vision#1712):

We will be releasing a new version of PyTorch and torchvision early next week, so this should be soon fixed.

[dali-automaton]

CI MESSAGE: [1056003]: BUILD FAILED

[JanuszL]

Please check my coment

[JanuszL]

The torchvision fix is due out early next week (pytorch/vision#1712):

We will be releasing a new version of PyTorch and torchvision early next week, so this should be soon fixed.

It won't help us much as we need a version for CUDA 9 which is no longer maintained and won't be updated.

[jantonguirao]

Suggested change

	pip_packages="pillow=6.2.2 torchvision torch"
	pip_packages="pillow==6.2.2 torchvision torch"

[jantonguirao]

!build

[dali-automaton]

CI MESSAGE: [1060558]: BUILD STARTED

[dali-automaton]

CI MESSAGE: [1060558]: BUILD PASSED

[hugovk]

torchvision v0.5.0 has been released with the fix:

1. Require torchvision>=0.5.0
2. If Pillow was temporarily pinned, remove the pin

[JanuszL]

@hugovk - it is not available for CUDA9 so we need to stick to this workaround.