Preprocess on custom dataset

[Sushant581]

How can we use preprocessing on our dataset? The Readme does not explain preprocessing step or how to create/Understand following statement in README

"src_dir should contain the following files (using test split as an example): test.source test.source.tokenized test.target test.target.tokenized test.out test.out.tokenized"

so that we can run SimCLS on our dataset