fix(logging): log INFO only on main rank - #39
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Summary
Under
accelerate launch, every rank ranmain()and emitted log messages independently, producing N copies of everylogger.infoline (one per GPU).setup_logging()now reads theRANKenvironment variable (set by accelerate before spawning processes) and installs aNullHandleron all non-zero ranks, so only rank 0 produces any log output.Type of change