title: error in importing catboost ubuntu18.04 on conda environment
body: <p>Error while importing catboost.
      from catboost import CatBoostRegressor.</p>
  
  <p>I am using conda on ubuntu. Followed suggested way to install catboost as on the official website. But run into an error while importing it.</p>
  
  <pre><code>AttributeError                            Traceback (most recent call last)
  &lt;ipython-input-45-d222a454d36a&gt; in &lt;module&gt;()
  ----&gt; 1 from catboost import CatBoostRegressor
  
  ~/anaconda3/lib/python3.6/site-packages/catboost/__init__.py in &lt;module&gt;()
  ----&gt; 1 from .core import FeaturesData, EFstrType, Pool, CatBoost, CatBoostClassifier, 
  CatBoostRegressor, CatboostError, cv, train, sum_models  # noqa
    2 from .version import VERSION as __version__  # noqa
    3 __all__ = ['FeaturesData', 'EFstrType', 'Pool', 'CatBoost', 'CatBoostClassifier', 
  'CatBoostRegressor', 'CatboostError', 'cv', 'train', 'sum_models']
    4 
    5 try:
  
  ~/anaconda3/lib/python3.6/site-packages/catboost/core.py in &lt;module&gt;()
   50 
   51 
  ---&gt; 52 _catboost = get_catboost_bin_module()
   53 _PoolBase = _catboost._PoolBase
   54 _CatBoost = _catboost._CatBoost
  
  ~/anaconda3/lib/python3.6/site-packages/catboost/core.py in get_catboost_bin_module()
   41     for so_path in so_paths:
   42         try:
  ---&gt; 43             loaded_catboost = imp.load_dynamic('_catboost', so_path)
   44             sys.modules['catboost._catboost'] = loaded_catboost
   45             return loaded_catboost
  
  ~/anaconda3/lib/python3.6/imp.py in load_dynamic(name, path, file)
  341         spec = importlib.machinery.ModuleSpec(
  342             name=name, loader=loader, origin=path)
  --&gt; 343         return _load(spec)
  344 
  345 else:
  
  _catboost.pyx in init _catboost()
  AttributeError: type object '_catboost.Py_ITypedSequencePtr' has no attribute 
  '__reduce_cython__'
  </code></pre>