List down various approaches for machine learning?

Q What are matrix organizational structures?
Q How labour cost variance is measured ?
Q What is meant by retroactive accounting?
Q Can long/long raw be clustered ?
Q what is master data harmonization ?
Q What is code signing?
Q How will you create a dictionary in python
Q Describe the coefficient of correlation?
Q How you can show a Message Box in Windows Forms application?
Q How to exclude a property from xml serialization?
Q Where is the headquarters of the Indian Council of Agricultural Research (ICAR)?