title: Scoring Metric for scikit-learn's LassoCV
body: <p>I'm using scikit-learn's <a href="http://scikit-learn.org/stable/modules/generated/sklearn.linear_model.LassoCV.html" rel="nofollow noreferrer">LassoCV</a> function. During cross-validation, what <a href="http://scikit-learn.org/stable/modules/classes.html#module-sklearn.metrics" rel="nofollow noreferrer">scoring metric</a> is being used by default? </p>
  
  <p>I would like cross-validation to be based on "Mean squared error regression loss". Can one use this metric with LassoCV? One can specify a scoring metric for <a href="http://scikit-learn.org/stable/modules/generated/sklearn.linear_model.LogisticRegressionCV.html" rel="nofollow noreferrer">LogisticRegressionCV</a>, so it may be possible with LassoCV too?</p>