text: from fvcore.common.param_scheduler import MultiStepParamScheduler
  
  from detectron2.config import LazyCall as L
  from detectron2.solver import WarmupParamScheduler
  
  from .cascade_mask_rcnn_mvitv2_b_in21k_100ep import (
      dataloader,
      lr_multiplier,
      model,
      train,
      optimizer,
  )
  
  model.backbone.bottom_up.embed_dim = 192
  model.backbone.bottom_up.depth = 80
  model.backbone.bottom_up.num_heads = 3
  model.backbone.bottom_up.last_block_indexes = (3, 11, 71, 79)
  model.backbone.bottom_up.drop_path_rate = 0.6
  model.backbone.bottom_up.use_act_checkpoint = True
  
  
  train.init_checkpoint = "detectron2://ImageNetPretrained/mvitv2/MViTv2_H_in21k.pyth"
  
  
  # 36 epochs
  train.max_iter = 67500
  lr_multiplier = L(WarmupParamScheduler)(
      scheduler=L(MultiStepParamScheduler)(
          values=[1.0, 0.1, 0.01],
          milestones=[
              52500,
              62500,
              67500,
          ],
      ),
      warmup_length=250 / train.max_iter,
      warmup_factor=0.001,
  )
  optimizer.lr = 1.6e-4
  