onnxruntime

e8b0bdb1 - Shape inference: ReduceMean dispatcher, quant_pre_process: skip_symbolic_shape bugfix (#23558)

Shape inference: ReduceMean dispatcher, quant_pre_process: skip_symbolic_shape bugfix (#23558) ### Description - Add symbolic shape inference dispatcher for `ReduceMean`. - Reducemean is used in RMSNorm so shape inference fails for llama, phi, etc torch exported models. - Reuse the dispatcher for ReduceSum since ReduceMean 18+ and ReduceSum 13+ have the same specs other than the type of reduction done. - Fix an issue with `quant_pre_process` tool where the external data file is missing if `skip_symbolic_shape=True` and `skip_optimization=False`. - Add `"session.optimized_model_external_initializers_file_name"` to session options so that the external data gets saved in the same temp directory as the optimized model. ### Motivation and Context <!-- - Why is this change required? What problem does it solve? - If it fixes an open issue, please link to the issue here. -->