Normalization of RNA-Seq data

Hello, I am working on a minor project to cluster a small subset of samples from this project. Can someone please throw some more light on what normalization methods were adopted to normalize this data from raw counts to the final data set that has been posted on UC Irvine's data repository page - https://archive.ics.uci.edu/ml/datasets/gene+expression+cancer+RNA-Seq# ?? Thank you!