class_docstr: The post process for FCENet.
class_docstr_tok: ["The","post","process","for","FCENet","."]
code: def _get_boundary_single(self, score_map, scale):
      assert len(score_map) == 2
      assert score_map[1].shape[1] == 4 * self.fourier_degree + 2
  
      return self.fcenet_decode(
          preds=score_map,
          fourier_degree=self.fourier_degree,
          num_reconstr_points=self.num_reconstr_points,
          scale=scale,
          alpha=self.alpha,
          beta=self.beta,
          box_type=self.box_type,
          score_thr=self.score_thr,
          nms_thr=self.nms_thr,
      )
  
file_path: PaddleOCR/ppocr/postprocess/fce_postprocess.py
imports: import cv2
  import paddle
  import numpy
  from numpy.fft import ifft
  from ppocr.utils.poly_nms import poly_nms, valid_boundary
label_desc: Use image node_id 5 for calling the FCEPostProcess obj's underlying member method code with example usage: obj._get_boundary_single(score_map, scale) and returns: self