class_docstr: Model specification.
class_docstr_tok: ["Model","specification","."]
code: def __init__(self, level, params):
      self.level = level
      self.params = params
  
imports: import numpy
  import pandas
  import pytest
  from pandas.testing import assert_series_equal
  from sktime.datasets import load_airline, load_longley
  from sktime.forecasting.model_evaluation import evaluate
  from sktime.forecasting.structural import UnobservedComponents
  from sktime.split import SlidingWindowSplitter
  from sktime.utils.validation._dependencies import _check_soft_dependencies
label_desc: Use image node_id 1 to create a new ModelSpec object  with example: obj = ModelSpec(level, params)