Pin inputs to decoder operators as well

[jantonguirao]

Category:

Refactoring

Description:

• ImageDecoder (particularly HW decoder) requires the input to be on pinned memory (as it is copied to GPU memory). If the input of the operator is not pinned, we need to copy the inputs to a pinned buffer unnecessarily.
• Before this change, all mixed operator inputs are pinned except the inputs of the decoders.* operators.
• This PR removes that exception, allowing the input to be consumed directly by nvjpeg
• In the following picture we can see a gap in the execution between parsing samples and the decoding itself, due to copying 512 samples to pinned memory.
  

Additional information:

Affected modules and functionalities:

• ImageDecoder

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
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• N/A

DALI team only

Requirements

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

REQ IDs: N/A

JIRA TASK: N/A

[jantonguirao]

!build

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