# optimizer
optimizer = dict(type="SGD", lr=0.04, momentum=0.9, weight_decay=0.0001)
optimizer_config = dict(grad_clip=None)
# learning policy
lr_config = dict(
    policy="step",
    warmup="linear",
    warmup_iters=500,
    warmup_ratio=0.001,
    step=[8, 11],
)
runner = dict(type="EpochBasedRunner", max_epochs=12)