Add explicit CUDA graph construction API#1729

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Andy-Jost wants to merge 25 commits intoNVIDIA:mainfrom

Andy-Jost:explicit-graph-construction

Commits on Mar 3, 2026

Convert _graph.py to _graph/ package for explicit graph construction work
Andy-Jost
committed

Commits on Mar 4, 2026

Added GraphHandle to RAII module.
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Commits on Mar 5, 2026

Add GraphDef and Node classes for explicit graph construction
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Add Node class hierarchy with type-specific properties and parameterized tests
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Add MemsetNode with shared _parse_fill_value utility
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Add EventRecordNode and EventWaitNode with Event.from_handle support
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Replace GraphDef.root with forwarding methods and GraphDef.join
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Improve __repr__ for graph nodes, add Node.handle, use as_py for GraphDef.handle
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Add MemcpyNode with auto-detected memory types
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Add ChildGraphNode with embed() builder and non-owning graph handle
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Add HostCallbackNode with Python callable and ctypes CFUNCTYPE support
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Fix dangling child graph references by capturing parent handle
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Add conditional graph nodes (IfNode, IfElseNode, WhileNode, SwitchNode)
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Reconstruct conditional node subtypes on CUDA 13.2+ drivers
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Apply developer guide styling to _graphdef.pyx
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Commits on Mar 6, 2026