Add skip_root parameter to linalg_vector_norm signature #2746
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PyTorch is adding a skip_root parameter to linalg_vector_norm that skips the root portion of the p-norm computation. This enables better numerics for distributed gradient norm computation. Update the native_functions.yaml to match PyTorch's new signature. The XPU implementation doesn't need changes - skip_root defaults to False and the existing behavior is preserved. See: pytorch/pytorch#172602 Authored with Claude.
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