code: def __init__(
      self, binary_thresh=0.5, export_onnx=False, assign_on_cpu=False
  ):
      super(MaskPostProcess, self).__init__()
      self.binary_thresh = binary_thresh
      self.export_onnx = export_onnx
      self.assign_on_cpu = assign_on_cpu
  
imports: import numpy
  import paddle
  import paddle.nn
  import paddle.nn.functional
  from ppdet.core.workspace import register
  from ppdet.modeling.bbox_utils import nonempty_bbox
  from .transformers import bbox_cxcywh_to_xyxy
label_desc: Use image node_id 1 to create a new MaskPostProcess object from inherited base classes: object with example: obj = MaskPostProcess(binary_thresh, export_onnx, assign_on_cpu)