[Grappler] Preserve symbolic IDs outside dynamic inference - #59
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Keep legacy negative symbolic dimension IDs for normal GraphProperties consumers while retaining expression-backed shapes for dynamic value inference.
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Summary
Keep Grappler's legacy negative symbolic dimension IDs when dynamic value inference is disabled. Dynamic inference continues to use size
-1with expression metadata.This prevents shape-based arithmetic rewrites from grouping unrelated unknown dimensions. In particular,
AddOpsRewriteno longer creates an invalidAddNfor broadcast inputs when a model is run with different batch sizes.Tests
GraphPropertiesTest.SymbolicShapesGraphPropertiesTest.SizeContentsPropagateToFillOutputArithmeticOptimizerTest.AddOpsRewriteAddOpsOfSymbolicallyEqualShapeArithmeticOptimizerTest.AddOpsRewriteMinimizeBCastWithSymbolicShapes1,2Fixes #58