code: def test_pairgrid(self):
      df = self.iris
  
      pg = df.sns.PairGrid()
      self.assertIsInstance(pg, sns.PairGrid)
      self._check_axes_shape(
          pg.axes, axes_num=25, layout=(5, 5), figsize=None
      )
  
imports: import pytest
  import matplotlib
  import numpy
  import sklearn.datasets
  import pandas_ml
  import pandas_ml.util.testing
label_desc: Use image node_id 9 for calling the TestSeabornCategorical obj's underlying member method code with example usage: obj.test_pairgrid() without return types