Add C++ IR (Graph) entry point to the optimizer - #319
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Previously every public entry point required a ModelProto (or serialized bytes / file path); the in-memory ONNX C++ IR (Graph) was only ever built internally via ImportModelProto and torn down via ExportModelProto, never exposed as an input. A C++ caller already holding a Graph had to pay a full serialize/parse round-trip on both sides just to run the passes. Add in-place Graph entry points that run the configured passes directly on the IR: - Optimizer::optimize(Graph&) overload that runs the pass manager on the graph in place; the existing optimize(ModelProto&) now reuses it. - Free functions OptimizeGraph / OptimizeGraphFixed mirroring Optimize / OptimizeFixed but operating on a Graph&. Proto-level concerns (ir_version upgrade, function copying) stay on the ModelProto path since they have no Graph equivalent. The additions are purely additive with no ABI break. Add a gtest covering the Graph path. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01U7PHiYF9q8Tv1KWV5w65Hq Signed-off-by: take-cheeze <takechi101010@gmail.com>
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Previously every public entry point required a ModelProto (or serialized bytes / file path); the in-memory ONNX C++ IR (Graph) was only ever built internally via ImportModelProto and torn down via ExportModelProto, never exposed as an input. A C++ caller already holding a Graph had to pay a full serialize/parse round-trip on both sides just to run the passes.
Add in-place Graph entry points that run the configured passes directly on the IR:
Proto-level concerns (ir_version upgrade, function copying) stay on the ModelProto path since they have no Graph equivalent. The additions are purely additive with no ABI break. Add a gtest covering the Graph path.
Claude-Session: https://claude.ai/code/session_01U7PHiYF9q8Tv1KWV5w65Hq