class_docstr: Channel attention module.
  Args:
      in_channels (int): The number of input channels.
class_docstr_tok: ["Channel","attention","module",".","Args",":","in_channels","(","int",")",":","The","number","of","input","channels","."]
code: def __init__(self, channels):
      super().__init__()
  
      self.channels = channels
      self.gamma = self.create_parameter(
          shape=[1],
          dtype="float32",
          default_initializer=nn.initializer.Constant(0),
      )
  
imports: import paddle
  import paddle.nn
  import paddle.nn.functional
  from paddleseg.models import layers
label_desc: Use image node_id 1 to create a new CAM object from inherited base classes: nn with example: obj = CAM(channels)