[MM][CG][BugFix] Fix Ernie-4.5-VL encoder CG postprocess for multi-path outputs - #51461
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Purpose
Fix-forward for the crash that prompted #51263 (revert of #45254), instead of reverting.
SupportsEncoderCudaGraph.postprocess_encoder_outputnow receivesoutputs: dict[str, torch.Tensor]keyed by encoder path (multi-path graph support), butErnie4_5_VLMoeForConditionalGeneration's override still treatedthe first arg as a single tensor:
File "vllm/model_executor/models/ernie45_vl.py", line 1734, in postprocess_encoder_output grid_thw = batch_mm_kwargs["image_grid_thw"].to(output.device) AttributeError: 'dict' object has no attribute 'device'#45254and the multi-path framework change merged around the same time, so each was green independently but the combination broke encoder CUDA-graph replay for Ernie-4.5-VL onmain.Test
pytest tests/models/multimodal/generation/test_vit_cudagraph.py::test_vit_cudagraph_image[ernie45_vl]— the same case reported in #51263 (build 82629).
Closes #51263 by fixing forward