Add Device.arch property for convenient compute capability string access

[Copilot]

This PR adds a convenient Device.arch property that returns the compute capability as a concatenated string, eliminating the need for repetitive string concatenation code throughout the codebase.

Problem

Previously, getting the compute capability as a string required this verbose pattern everywhere:

arch = "".join(f"{i}" for i in dev.compute_capability)
program_options = ProgramOptions(std="c++17", arch=f"sm_{arch}")

This pattern appeared in 8 locations across 7 example files and was identified as annoying repetitive code.

Solution

Added a new arch property to the Device class:

@property
def arch(self) -> str:
    """Return compute capability as a string (e.g., '75' for CC 7.5)."""
    return "".join(f"{i}" for i in self.compute_capability)

Now the usage is much cleaner:

arch = dev.arch
program_options = ProgramOptions(std="c++17", arch=f"sm_{arch}")

Changes

• Added Device.arch property in cuda_core/cuda/core/experimental/_device.py
• Updated 8 occurrences across 7 example files to use the new property:
  • cuda_core/examples/vector_add.py
  • cuda_core/examples/simple_multi_gpu_example.py (2 occurrences)
  • cuda_core/examples/pytorch_example.py
  • cuda_core/examples/strided_memory_view_gpu.py
  • cuda_core/examples/saxpy.py
  • cuda_core/examples/cuda_graphs.py
  • cuda_core/examples/memory_ops.py
• Added comprehensive test for the new property in test_device.py
• Preserved existing test files unchanged as requested

Benefits

• More concise and readable code
• Eliminates repetitive string concatenation
• Provides a clear, discoverable API
• Maintains full backward compatibility
• Works correctly with all compute capability values (tested with edge cases)

Fixes #729.

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[leofang]

@copilot looking good! One nit: in all samples, could you just merge the dev.arch access to the f-strings where arch is needed, instead of having a separate call?

[Copilot]

@copilot looking good! One nit: in all samples, could you just merge the dev.arch access to the f-strings where arch is needed, instead of having a separate call?

Done! I've updated all the example files to inline the dev.arch calls directly into the f-strings instead of having separate variable assignments. This makes the code more concise as requested. Changes made in commit c940eca.

[leofang]

@copilot looking good, please add a release note

[Copilot]

@copilot looking good, please add a release note

Added release note for the new Device.arch property in the "New features" section. The note documents the property and its convenience benefit. (7fc9d1b)

[leofang]

/ok to test 7fc9d1b

[kkraus14]

/ok to test

[copy-pr-bot]

/ok to test

@kkraus14, there was an error processing your request: E1

See the following link for more information: https://docs.gha-runners.nvidia.com/cpr/e/1/

[kkraus14]

/ok to test 491fb89

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