-Determines how the linear predictor is transformed to predictions. Allowed values are "identity", "logit" and "log". For an ordinary regression model use ***family*** "gaussian" and ***link_function*** "identity". For logistic regression use ***family*** "binomial" and ***link_function*** "logit". For a multiplicative model use the "log" ***link_function***. The "log" ***link_function*** often works best with a "poisson", "gamma" or "tweedie" ***family***, depending on the data. The ***family*** "poisson", "gamma" or "tweedie" should only be used with the "log" ***link_function***. Inappropriate combinations of ***family*** and ***link_function*** may result in a warning message when fitting the model and/or a poor model fit. Please note that values other than "identity" typically require a significantly higher ***m*** (or ***v***) in order to converge. This is not intended to be a tuning parameter because it defines the model structure. However, if you wish to tune it then the method ***get_validation_group_mse()*** provides a useful tuning metric.
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