Redundant initializers introduced to the models using eliminate passes.

I noticed an odd behavior, when using R-CNN models from ONNX Model Hub: The optimizer adds redundant initializer nodes to the models, in different passes (e.g., eliminate_shape_gather and eliminate_nop_reshape). Upon execution, they are removed and the models work, however the models get bloated this way and it would be nice to resolve this, as it has to do with eliminate passes which are part of the default optimization bundle.

Pass: eliminate_shape_gather, Model: Faster R-CNN R-50-FPN-int8, opset=12
2025-03-18 19:36:45.016246632 [W:onnxruntime:, graph.cc:3553 CleanUnusedInitializersAndNodeArgs] Removing initializer '2797'. It is not used by any node and should be removed from the model.
2025-03-18 19:36:45.016284009 [W:onnxruntime:, graph.cc:3553 CleanUnusedInitializersAndNodeArgs] Removing initializer '2473'. It is not used by any node and should be removed from the model.
2025-03-18 19:36:45.016317849 [W:onnxruntime:, graph.cc:3553 CleanUnusedInitializersAndNodeArgs] Removing initializer '2586'. It is not used by any node and should be removed from the model.
2025-03-18 19:36:45.016338868 [W:onnxruntime:, graph.cc:3553 CleanUnusedInitializersAndNodeArgs] Removing initializer '2561'. It is not used by any node and should be removed from the model.
2025-03-18 19:36:45.016384071 [W:onnxruntime:, graph.cc:3553 CleanUnusedInitializersAndNodeArgs] Removing initializer '2034'. It is not used by any node and should be removed from the model.
2025-03-18 19:36:45.016395604 [W:onnxruntime:, graph.cc:3553 CleanUnusedInitializersAndNodeArgs] Removing initializer '1738'. It is not used by any node and should be removed from the model.
2025-03-18 19:36:45.016400882 [W:onnxruntime:, graph.cc:3553 CleanUnusedInitializersAndNodeArgs] Removing initializer '2555'. It is not used by any node and should be removed from the model.
2025-03-18 19:36:45.016446202 [W:onnxruntime:, graph.cc:3553 CleanUnusedInitializersAndNodeArgs] Removing initializer '2499'. It is not used by any node and should be removed from the model.
2025-03-18 19:36:45.016466860 [W:onnxruntime:, graph.cc:3553 CleanUnusedInitializersAndNodeArgs] Removing initializer '2476'. It is not used by any node and should be removed from the model.
2025-03-18 19:36:45.016477887 [W:onnxruntime:, graph.cc:3553 CleanUnusedInitializersAndNodeArgs] Removing initializer '2583'. It is not used by any node and should be removed from the model.
2025-03-18 19:36:45.016498564 [W:onnxruntime:, graph.cc:3553 CleanUnusedInitializersAndNodeArgs] Removing initializer '2505'. It is not used by any node and should be removed from the model.
2025-03-18 19:36:45.016528857 [W:onnxruntime:, graph.cc:3553 CleanUnusedInitializersAndNodeArgs] Removing initializer '2527'. It is not used by any node and should be removed from the model.
2025-03-18 19:36:45.016550868 [W:onnxruntime:, graph.cc:3553 CleanUnusedInitializersAndNodeArgs] Removing initializer '2479'. It is not used by any node and should be removed from the model.
2025-03-18 19:36:45.016557028 [W:onnxruntime:, graph.cc:3553 CleanUnusedInitializersAndNodeArgs] Removing initializer '2502'. It is not used by any node and should be removed from the model.
2025-03-18 19:36:45.016563560 [W:onnxruntime:, graph.cc:3553 CleanUnusedInitializersAndNodeArgs] Removing initializer '2530'. It is not used by any node and should be removed from the model.
2025-03-18 19:36:45.016569462 [W:onnxruntime:, graph.cc:3553 CleanUnusedInitializersAndNodeArgs] Removing initializer '2533'. It is not used by any node and should be removed from the model.
2025-03-18 19:36:45.016575731 [W:onnxruntime:, graph.cc:3553 CleanUnusedInitializersAndNodeArgs] Removing initializer '2558'. It is not used by any node and should be removed from the model.
2025-03-18 19:36:45.016582126 [W:onnxruntime:, graph.cc:3553 CleanUnusedInitializersAndNodeArgs] Removing initializer '2589'. It is not used by any node and should be removed from the model.

Pass: eliminate_nop_reshape, Model: Faster R-CNN R-50-FPN-int8, opset=12
2025-03-18 19:37:51.308402762 [W:onnxruntime:, graph.cc:3553 CleanUnusedInitializersAndNodeArgs] Removing initializer '823'. It is not used by any node and should be removed from the model.
2025-03-18 19:37:51.308431172 [W:onnxruntime:, graph.cc:3553 CleanUnusedInitializersAndNodeArgs] Removing initializer '579'. It is not used by any node and should be removed from the model.
2025-03-18 19:37:51.308496786 [W:onnxruntime:, graph.cc:3553 CleanUnusedInitializersAndNodeArgs] Removing initializer '640'. It is not used by any node and should be removed from the model.
2025-03-18 19:37:51.308506370 [W:onnxruntime:, graph.cc:3553 CleanUnusedInitializersAndNodeArgs] Removing initializer '762'. It is not used by any node and should be removed from the model.
2025-03-18 19:37:51.308530685 [W:onnxruntime:, graph.cc:3553 CleanUnusedInitializersAndNodeArgs] Removing initializer '701'. It is not used by any node and should be removed from the model.

Similar results apply for "Faster R-CNN R-50-FPN-qdq.

Reproduce the issue with the Faster R-CNN R-50-FPN-int8 ONNX Model Hub model at opset 12, then inspect the eliminate_shape_gather and eliminate_nop_reshape passes. Compare the model before and after each pass, focusing on the initializers reported by CleanUnusedInitializersAndNodeArgs. Done means the default optimization bundle no longer leaves redundant initializers in these models.