code: def setup(self):
      K = 50
      N = 50001
      rng = date_range("1/1/2000", periods=N, freq="min")
      self.series = {}
      for i in range(1, K):
          data = np.random.randn(N)[:-i]
          idx = rng[:-i]
          data[100:] = np.nan
          self.series[i] = Series(SparseArray(data), index=idx)
  
imports: import numpy
  import scipy.sparse
  import pandas
  from pandas import MultiIndex, Series, date_range
  from pandas.arrays import SparseArray
  from .pandas_vb_common import setup
label_desc: Use image node_id 1 for calling the SparseSeriesToFrame obj's underlying member method code with example usage: obj.setup() without return types