$.$ For each of the machine learning approaches, discuss the data$-$preprocessing steps that you have implemented to optimally transform the dataset for that specific machine learning approach and to correct

data quality issues. Note: do not do unnecessary data transformations. Carefully think about the data

transformations needed for your selected machine learning algorithms. Provide justifications for each of

these pre$-$processing steps. Should you decide not to address a data quality issue, justify this decision.

When you pre$-$process the dataset, make sure that you do not change the order of the instances in the

dataset.