replace the word "fair" with "offline"

[HiIAmTzeKean]

fair is not clear and subjective

[HiIAmTzeKean]

• [x] The abstract shall provide some background, instead of directly reporting what has been developed without providing any context.

• [x] Try not to use too many capital letters for section titles.

• [x] In the Intro part, when mentioning about data leakage, can explain the meaning of data leaking in this context.

• [x] Title: Streamsight: A toolkit for fair evaluation of Recommender Systems, I would suggest to remove “fair” and add in “offline”. “Fairness” carry very specific meanings in RecSys.

[HiIAmTzeKean]

• [x] include computation for metric int he metric section