code: def clear(self) -> None:
      self.mask_grids = []  # 标签宫格
      self.json_labels = []  # 保存标签
      self.grid_count = None  # (row count, col count)
      self.curr_idx = None
  
file_path: PaddleSeg/EISeg/eiseg/plugin/n2grid/rs_grid.py
imports: import numpy
  from typing import List, Tuple
  from eiseg.plugin.remotesensing.raster import Raster
label_desc: Use image node_id 2 for calling the RSGrids obj's underlying member method code with example usage: obj.clear() without return types