xgb.gblinear.history | R Documentation |

A helper function to extract the matrix of linear coefficients' history
from a gblinear model created while using the `cb.gblinear.history()`

callback.

xgb.gblinear.history(model, class_index = NULL)

`model` |
either an |

`class_index` |
zero-based class index to extract the coefficients for only that specific class in a multinomial multiclass model. When it is NULL, all the coefficients are returned. Has no effect in non-multiclass models. |

For an `xgb.train`

result, a matrix (either dense or sparse) with the columns
corresponding to iteration's coefficients (in the order as `xgb.dump()`

would
return) and the rows corresponding to boosting iterations.

For an `xgb.cv`

result, a list of such matrices is returned with the elements
corresponding to CV folds.

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