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optimizer = dict(type='SGD', lr=1e-3, momentum=0.99, weight_decay=5e-4)
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train_cfg = dict(by_epoch=True, max_epochs=600)
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val_cfg = dict(interval=50)
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test_cfg = dict()
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# learning policy
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param_scheduler = [
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dict(type='MultiStepLR', milestones=[200, 400], end=600),
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]
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