code: def celliter(self):
      # supply data by grouping on the first parameter
      for i, (name, values) in enumerate(self.rowiter()):
          for j, value in enumerate(values):
              yield i, j, value
  
file_path: sklearn-evaluation/src/sklearn_evaluation/plot/matplotlib/data_grid.py
imports: import numpy
  import pandas
label_desc: Use image node_id 2 for calling the DataGrid obj's underlying member method code with example usage: obj.celliter() without return types