class_docstr: Month of year encoded as value between [-0.5, 0.5]
code: def __call__(self, index: pd.DatetimeIndex) -> np.ndarray:
      return (index.month - 1) / 11.0 - 0.5
  
imports: import random
  from itertools import chain
  import numpy
  import pandas
  from typing import List
label_desc: Use image node_id 1 for calling the MonthOfYear obj's underlying member method code with example usage: obj.__call__(index) and returns: unknown