Book Errata - Page 52

[neversatisfied]

The command shown has -m set to 2 and above the paragraph states you will set M to 5 . Not super important, but thought you might wish to be aware.

Oh thanks! Good catch

[cpuodzius]

Following this segment, I get different results than those indicated in the text.

• Eps = 0.5, MinPts = 2

$ python2 cluster_vectors.py -c dbscan -e 0.5 -m 2 -i secrepo.h5 -o secrepo_dbscan.h2
Label 0 has 9994 samples
Label 1 has 2 samples
Label 2 has 4 samples

The results in the text:

“As we can see, DBSCAN has created 62 clusters and left 854 samples unassigned. Each of these 854 noise points may be associated with malicious activity.”

• Eps = 6, MinPts = 5

$ python2 cluster_vectors.py -c dbscan -e 6 -m 5 -i secrepo.h5 -o secrepo_dbscan.h2
Label 0 has 10000 samples

The results in the text:

“This time, DBSCAN generated 11 clusters and only 25 noise points, a much more manageable number. ”