code: def out_shape(self):
      return [
          ShapeSpec(channels=c)
          for c in [self._out_channels[0], self._out_channels[1]]
      ]
  
imports: import paddle
  import paddle.nn.functional
  from paddle import ParamAttr
  import paddle.nn
  from paddle.nn.initializer import KaimingNormal
  from ppdet.core.workspace import register, serializable
  from ..shape_spec import ShapeSpec
label_desc: Use image node_id 3 for calling the BlazeNeck obj's underlying member method code with example usage: obj.out_shape() and returns: unknown