Mastering Scala Machine Learning

Distinct values of a categorical field

Now, you have a dataset and a computer. For convenience, I have provided you a small anonymized and obfuscated sample of clickstream data with the book repository that you can get at https://github.com/alexvk/ml-in-scala.git. The file in the chapter01/data/clickstream directory contains lines with timestamp, session ID, and some additional event information such as URL, category information, and so on at the time of the call. The first thing one would do is apply transformations to find out the distribution of values for different columns in the dataset.

Figure 01-1 shows screenshot shows the output of the dataset in the terminal window of the gzcat chapter01/data/clickstream/clickstream_sample.tsv.gz | less ...