Signed-off-by: Yiheng Wang [email protected]

Fixes #3879 .

Description

This PR fixes the issue via:

1. Skip some unit tests before torch==1.7, and add some notes to clarify the resons.
2. Use deepcopy for input_image if it has further usage.

Status

Ready

Types of changes

• Non-breaking change (fix or new feature that would not break existing functionality).
• Breaking change (fix or new feature that would cause existing functionality to change).
• New tests added to cover the changes.
• Integration tests passed locally by running ./runtests.sh -f -u --net --coverage.
• Quick tests passed locally by running ./runtests.sh --quick --unittests --disttests.
• In-line docstrings updated.
• Documentation updated, tested make html command in the docs/ folder.