• IRIS Flowers Data Set. One of the most common data set being used by the beginners for getting started with Pattern Recognition. This data set contains 3 different types of irises’ (Setosa, Versicolour, and Virginica) petal and sepal length. (Courtesy UCI).
• Breast Cancer Data Set. A data set to perform classification tasks to identify if there’s cancer in the mammography or not.
• Jewellery Data Set. A basic data set to start testing your CV algorithms to perform classification tasks. 
• Shapeset. An artificially generated images to train machines to identify different geometrical shapes. 

• News Data Set. A collection of 20 news groups top train a text classifier on different types of news.
• Wine Quality Data Set. Related to Red and White variants of Portuguese “Vinho Verde” wine. This data set can be used for both Classification and Regression tasks. (Courtesy UCI).
• Diabetes Data Set. A Categorical Data set of Diabetes records. (Courtesy UCI).

More will be added soon.