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i've run into a possible bug / race condition with NCCL RAS (using nccl 2.26.5) I think this is tied to NCCL, but FWIW i've confirmed this to affect both (python 3.12.7 + torch 2.6.0) and (python 3.10 ...

1Department of Hematology, Oncology and Cancer Immunology, Charité—Universitaetsmedizin Berlin, Corporate Member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Berlin, Germany.

1 Department of Radiation Oncology, Inselspital, Bern University Hospital, Bern, Switzerland 2 Radiation Oncology, Department for BioMedical Research, University of Bern, Bern, Switzerland RAS ...