code: def pandas_series():
      y = np.random.choice(["a", "b", "c"], 100)
      return pd.Series(y)
  
imports: import dask
  import dask.array
  import dask.dataframe
  import numpy
  import pandas
  import pytest
  import sklearn.preprocessing
  from dask.array.utils import assert_eq
  import dask_ml.preprocessing
  from dask_ml.utils import assert_estimator_equal
label_desc: Use image node_id 1 for calling a global function with example usage: pandas_series() and returns: pd