akaashrp opened a new pull request, #20128:
URL: https://github.com/apache/tvm/pull/20128

   PyTorch exported programs may describe input dimensions using expressions 
derived from other symbolic dimensions, such as `2 * n`. The importer 
previously recognized these expressions but replaced them with independent TIR 
variables when constructing the Relax function signature. This discarded the 
relationship between the dimensions.
   
   This PR:
   - Preserves derived TIR expressions when constructing input tensor shapes
   - Records range constraints only for direct symbolic variables
   - Accepts input shape and dtype metadata from either `tensor_meta` or 
placeholder value metadata
   - Reports an explicit error when input shape or dtype metadata is unavailable


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