Strategies to make predictions when using the DummyRegressor:

• strategy = "mean". Predicts the mean value of the training set targets
• strategy = "median". Predicts the median value of the training set targets.
• strategy = "constant". Predicts a constant, user-provided value. Value is provided using the constant parameter.
• strategy = "quantile". Predicts a quantile (specified by the user) of the training set targets. Value provided using the quantile parameter.