Preserve dynamic shape expressions through constant folding - #22
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resolve the issue for the xla batch matcher flag is set but invalid
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Summary
This PR preserves dynamic shape expressions when TensorFlow partially evaluates shape-derived values and replaces them with constants. Without this metadata, XLA sees only the concrete value used during compilation and can lose the relationship with the dynamic input size.
The change:
Shape,Slice,StridedSlice,Gather,Reshape,Pack,ConcatV2, andProd;Constnodes and restores them when building XLA constants and compile-time arguments;Tests
FoldShapeFromDynamicArgPreservesContents: keeps the expressions produced byShape.FoldSliceOfDynamicShapePreservesContents: keeps the selected dynamic dimension throughSlice.FoldGatherOfDynamicShapePreservesContents: keeps a gathered dynamic dimension in a scalar result.FoldReshapeOfDynamicShapePreservesContents: keeps symbolic contents when a one-element vector is reshaped to a scalar.FoldPackOfDynamicShapePreservesContents: keeps dynamic and static entries when they are packed into one shape tensor.DoNotFoldUnsupportedDynamicContentsTransform: leaves unsupported transformations unfurled instead of dropping their expressions.NoReplacePartialOutput: checks that non-CPU multi-output operations are not partially replaced.