Use small videos in checkpointing tests

[szkarpinski]

Category:

Other -- test optimization

Description:

Checkpointing tests are taking some time to complete (especially with sanitizer). Video reader tests take 60% of the time spent in test_dali_checkpointing.

When testing checkpointing, we just want to see if the correct frames are produced after restoring. To do that, we don't need full resolution videos and small videos added in NVIDIA/DALI_extra#127 are fine.

In this PR I make checkpointing tests of video_reader and video_resize_reader use small videos. This results in ~15x speedup in those tests (which should result in ~2x total speedup for test_dali_checkpointing)

Additional information:

Affected modules and functionalities:

Checkpointing tests

Key points relevant for the review:

Tests:

• Existing tests apply
• New tests added
  • Python tests
  • GTests
  • Benchmark
  • Other
• N/A

Checklist

Documentation

• Existing documentation applies
• Documentation updated
  • Docstring
  • Doxygen
  • RST
  • Jupyter
  • Other
• N/A

DALI team only

Requirements

• Implements new requirements
• Affects existing requirements
• N/A

REQ IDs: N/A

JIRA TASK: N/A

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[szkarpinski]

!build

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