Question

why do your colleagues compute mses of the same models twice, and the second time on a different dataset?

Answer 1

The colleagues compute MSE's of same models twice and the second time on a different dataset to increase the probability of correct dataset.

What is a dataset?

A group of data is referred to as a data set (or dataset). When dealing with tabular data, a data set is equivalent to one or more database tables, each of which corresponds to a specific record of the corresponding data set and each of whose columns and rows represent different variables. Each member of the data set is given values for each of the variables, such as the object's height and weight, in the data set. A group of papers or files can also make up a data set. The information made available in a public open data repository is measured in open data by data sets.

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