code: def out_shape(self):
      return [ShapeSpec(channels=c) for c in self._out_channels]
  
imports: import paddle
  import paddle.nn
  import paddle.nn.functional
  from ppdet.core.workspace import register, serializable
  from ppdet.modeling.layers import DropBlock
  from ppdet.modeling.ops import get_act_fn
  from ..backbones.darknet import ConvBNLayer
  from ..shape_spec import ShapeSpec
  from ..backbones.csp_darknet import BaseConv, DWConv, CSPLayer
label_desc: Use image node_id 4 for calling the PPYOLOFPN obj's underlying member method code with example usage: obj.out_shape() and returns: unknown