I'm facing error whenever I import any Tree module from sklearn. Sample code below

```
from sklearn.ensemble import ExtraTreesRegressor
model = ExtraTreesRegressor()
model.fit(X,y)

```

The first time I run the code I get this error - 

```
ImportError: cannot import name 'LatentDirichletAllocation' from 'sklearn.decomposition._online_lda' (C:\Users\lenovo\Anaconda3\lib\site-packages\sklearn\decomposition_online_lda.cp37-win_amd64.pyd)

```

After that, whenever I run the same code, I get the following error - 

```
AttributeError: type object 'sklearn.tree.criterion.array' has no attribute 'reducecython'

```

The same code worked well before but suddenly it has stopped working for me

I've tried uninstalling and re-installing scikit-learn as well. Any help would be appreciated. Thanks :)