how GENIE3 package works?

Question

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How exactly GENIE3 package of R works? how it calculate the weight and what is the exact logic and calculation takes place behind it? How it decide the regulatoryGene and targetGene?

[GenoMax]

Have you checked the original paper? From vignette:

The GENIE3 method is described in:

Huynh-Thu V. A., Irrthum A., Wehenkel L., and Geurts P. (2010) Inferring regulatory networks from expression data using tree-based methods. PLoS ONE, 5(9):e12776.