fix: allow cuStreamBeginCaptureToGraph argument dependencyData to be optional

[cpcloud]

Closes #617.

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[cpcloud]

/ok to test

[greptile-apps]

Greptile Overview

Greptile Summary

This PR fixes a parameter validation bug in the cuStreamBeginCaptureToGraph binding. The function accepts an optional dependencyData parameter that can be None according to the CUDA API specification, but the implementation was incorrectly enforcing a length check against numDependencies for this optional parameter. The removed validation line (37008) was causing RuntimeErrors when users legitimately passed None for dependencyData. The fix removes this incorrect validation while preserving the necessary length check for the required dependencies parameter. This change aligns the Python bindings in cuda_bindings with the CUDA driver API specification and resolves issue #617.

Important Files Changed

Filename	Score	Overview
cuda_bindings/cuda/bindings/driver.pyx.in	5/5	Removed incorrect validation for optional dependencyData parameter in cuStreamBeginCaptureToGraph function

Confidence score: 5/5

• This PR is safe to merge with minimal risk
• Score reflects a straightforward bug fix that removes incorrect validation logic for an optional parameter without introducing new complexity or side effects; the change correctly aligns the bindings with CUDA API semantics
• No files require special attention

Sequence Diagram

sequenceDiagram
    participant User
    participant "Python Binding" as Binding
    participant "CUDA Driver API" as CUDA
    participant "GPU Stream" as Stream
    participant "CUDA Graph" as Graph

    User->>Binding: "cuStreamBeginCaptureToGraph(hStream, hGraph, dependencies, dependencyData, numDependencies, mode)"
    Note over User,Binding: dependencyData can now be None/optional
    Binding->>Binding: "Validate parameters"
    alt dependencyData is None
        Binding->>CUDA: "cuStreamBeginCaptureToGraph(hStream, hGraph, dependencies, NULL, numDependencies, mode)"
    else dependencyData is provided
        Binding->>CUDA: "cuStreamBeginCaptureToGraph(hStream, hGraph, dependencies, dependencyData, numDependencies, mode)"
    end
    CUDA->>Stream: "Begin capture mode"
    Stream->>Graph: "Capture operations to graph"
    CUDA-->>Binding: "Return CUDA result"
    Binding-->>User: "Return result or raise exception"

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[mdboom]

LGTM