code: def __init__(self, in_chan, mid_chan, n_classes):
      super().__init__()
      self.conv = layers.ConvBNReLU(
          in_chan,
          mid_chan,
          kernel_size=3,
          stride=1,
          padding=1,
          bias_attr=False,
      )
      self.conv_out = nn.Conv2D(
          mid_chan, n_classes, kernel_size=1, bias_attr=False
      )
  
imports: import paddle
  import paddle.nn
  import paddle.nn.functional
  from paddleseg import utils
  from paddleseg.models import layers
  from paddleseg.cvlibs import manager
  from paddleseg.utils import utils
label_desc: Use image node_id 1 to create a new SegHead object from inherited base classes: nn with example: obj = SegHead(in_chan, mid_chan, n_classes)