title: Creating a sklearn.linear_model.LogisticRegression instance from existing coefficients
body: <p>Can one create such an instance based on existing coefficients which were calculated say in a different implementation (e.g. Java)?</p>
  
  <p>I tried creating an instance then setting coef_ and intercept_ directly and it seems to work but I'm not sure if there's a down side here or if I might be breaking something.</p>