class_docstr: Base class for transition.
  
  Args:
      in_channels (int): Number of input channels.
      out_channels (int): Number of output channels.
code: def __init__(self, in_channels, out_channels, init_cfg=None):
      super().__init__(init_cfg)
      self.in_channels = in_channels
      self.out_channels = out_channels
  
imports: import torch.nn
  import torch.nn.functional
  from mmcv.cnn import ConvModule
  from mmengine.model import BaseModule
  from mmdet.registry import MODELS
label_desc: Use image node_id 1 to create a new Transition object from inherited base classes: BaseModule with example: obj = Transition(in_channels, out_channels, init_cfg)