code: def switch_theta(x: str):
      return {"STM": 0, "OTM": 1, "DSTM": 2, "DOTM": 3}[x]
  
imports: import math
  from typing import Tuple
  import numpy
  from numba import njit
  from scipy.stats import norm
  from statsmodels.tsa.seasonal import seasonal_decompose
  from statsmodels.tsa.stattools import acf
  from .ets import restrict_to_bounds, results
  from .utils import _seasonal_naive, _repeat_val_seas, CACHE, NOGIL
label_desc: Use image node_id 7 for calling a global function with example usage: switch_theta(x) and returns: dict