GBM: Model module: GBM
In zoonproject/modules: Species Distribution Modelling Code Modules for the ZOON Package

Model module to fit a generalized boosted regression (aka boosted regression trees) model

1	GBM(.df, max.trees = 1000, interaction.depth = 5, shrinkage = 0.001)

`.df`	Internal parameter, do not use in the workflow function. `.df` is data frame that combines the occurrence
`max.trees`	The maximum number of trees to fit. The number of trees is equivalent to the number of iterations and the number of basis functions in the additive expansion. The optimal number will be selected by cross-validation, but this sets an upper limit.
`interaction.depth`	The maximum depth of variable interactions. 1 implies an additive model, 2 implies a model with up to 2-way interactions, etc.
`shrinkage`	a shrinkage parameter applied to each tree in the expansion. Also known as the learning rate or step-size reduction.