text: Title: ValueError: Dimension has to be a list or tuple
  Body: Traceback (most recent call last):
  
    File "<ipython-input-91-3ab6d73131bd>", line 1, in <module>
      runfile('/Users/sameepshah/Desktop/Data/Practice/skoptHyperParm.py', wdir='/Users/sameepshah/Desktop/Data/Practice')
  
    File "/Users/sameepshah/anaconda3/lib/python3.6/site-packages/spyder/utils/site/sitecustomize.py", line 705, in runfile
      execfile(filename, namespace)
  
    File "/Users/sameepshah/anaconda3/lib/python3.6/site-packages/spyder/utils/site/sitecustomize.py", line 102, in execfile
      exec(compile(f.read(), filename, 'exec'), namespace)
  
    File "/Users/sameepshah/Desktop/Data/Practice/skoptHyperParm.py", line 315, in <module>
      x0=default_parameters)
  
    File "/Users/sameepshah/anaconda3/lib/python3.6/site-packages/skopt/optimizer/gp.py", line 214, in gp_minimize
      space = normalize_dimensions(dimensions)
  
    File "/Users/sameepshah/anaconda3/lib/python3.6/site-packages/skopt/utils.py", line 472, in normalize_dimensions
      space = Space(dimensions)
  
    File "/Users/sameepshah/anaconda3/lib/python3.6/site-packages/skopt/space/space.py", line 570, in __init__
      self.dimensions = [check_dimension(dim) for dim in dimensions]
  
    File "/Users/sameepshah/anaconda3/lib/python3.6/site-packages/skopt/space/space.py", line 570, in <listcomp>
      self.dimensions = [check_dimension(dim) for dim in dimensions]
  
    File "/Users/sameepshah/anaconda3/lib/python3.6/site-packages/skopt/space/space.py", line 70, in check_dimension
      raise ValueError("Dimension has to be a list or tuple.")
  
  ValueError: Dimension has to be a list or tuple.
  
  Hi guys I was trying to run your posted hyperparameter tuning model. I am getting this error help much appreciated.
  
  Thanks