code: def test_viewer_load_clears_state(self):
      table = Table({"a": [1, 2, 3]})
      viewer = PerspectiveViewer(theme="Pro Dark", group_by=["a"])
      viewer.load(table)
      assert viewer.group_by == ["a"]
      viewer.load({"b": [1, 2, 3]})
      assert viewer.group_by == []
      assert viewer.theme == "Pro Dark"
  
imports: import numpy
  import pandas
  from perspective import PerspectiveViewer, Table
label_desc: Use image node_id 9 for calling the TestViewer obj's underlying member method code with example usage: obj.test_viewer_load_clears_state() without return types