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Mastering .NET Machine Learning
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One of the underappreciated skills that a data scientist must possess is the ability to gather and assimilate heterogeneous data. Heterogeneous data is data from different sources, structures, and formats. Heterogeneous stands in contrast to homogenous data which assumes that all of the data that is imported is the same as all of the other data that may already exist. When the data scientist gets heterogeneous data, one of the first things they will do is transform the data to a point that it can be combined with the other data. The most common shape of that transformation is the data frame—sometimes called the rectangle because the columns are attributes and the rows are the data. For example, here is a data frame that we have seen earlier:

Ideally, each frame has a unique key that allows it to be combined with other data frames. In this case, ProductID is the primary key. If you are thinking that this is a lot like RDBMS theory—you are right.
One of the bigger differences between...
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