Promote scalars to constants in ndd arithmetic operators

[rostan-t]

Category:

Bug fix (non-breaking change which fixes an issue)

Description:

Currently, integers and floats are not promoted to constants in ndd arithmetic operators. This PR fixes it.

With a and b two 64x224x224x3 batches of uint8 images on the GPU, 0.4 * a + 0.6 * b takes around 640 us to run on main and below 230 us on this branch.

One important detail is that all bool/int/floats are currently promoted to constants, forcing the creation of a new operator instance each time. PR #6476 addresses this issue.

Additional information:

Affected modules and functionalities:

Airthmetic ops

Key points relevant for the review:

Tests:

• Existing tests apply: test_arithm_ops.py
• 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

[greptile-apps]

Confidence Score: 5/5

The PR appears safe to merge with no actionable correctness, security, compatibility, or repository-rule violations identified.

Summary

• Separates tensor operands from built-in boolean, integer, and floating-point constants.
• Preserves CPU/GPU placement checks for operands that still require tensor conversion.
• Marks the internal arithmetic constant vectors as ordinary schema arguments rather than tensor-capable arguments.

[rostan-t]

!build

[dali-automaton]

CI MESSAGE: [66962649]: BUILD STARTED

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CI MESSAGE: [66962649]: BUILD PASSED