Integrate CUDA Graph 4D in test_megatron_e2e_pipeline.py #121
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Bug: Commented import breaks function that still uses module
The import wlbllm.registry statement is commented out, but wlbllm.registry is still used in wlb_swap_next_forward_metadata() and wlb_swap_next_backward_metadata() functions. When these functions are called (when WLBLLM_MODE=1), they will raise a NameError because the module was never imported.
