parser.add_argument('--local_rank', type=int, default=-1, help='DDP parameter, do not modify')
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parser.add_argument中的action使用
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parser.add_argument('--local_rank', type=int, default=-1, help='DDP parameter, do not modify')
# This argument specifies the local rank of the process when using Distributed Data Parallel (DDP) for multi-GPU training.
# It is set to -1 by default, which means that DDP is not being used.
# If DDP is being used, this argument should be set to the local rank of the current process.
# The local rank is an integer value that uniquely identifies each process within the node.
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