code: def setup(self):
      N = 100000
      self.df = pd.DataFrame(
          {"A": [1, 2] * (N // 2), "B": np.random.randn(N)}
      )
  
imports: import warnings
  import numpy
  import pandas
  from .pandas_vb_common import setup
label_desc: Use image node_id 1 for calling the GroupbyLargeGroups obj's underlying member method code with example usage: obj.setup() without return types