Errata

Hilary Mason: An Introduction to Machine Learning with Web Data

Errata for Hilary Mason: An Introduction to Machine Learning with Web Data

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The errata list is a list of errors and their corrections that were found after the product was released.

The following errata were submitted by our customers and have not yet been approved or disproved by the author or editor. They solely represent the opinion of the customer.

Color Key: Serious technical mistake Minor technical mistake Language or formatting error Typo Question Note Update

Version Location Description Submitted by Date submitted
Other Digital Version 1
Teaser

I watched the teaser and was surprised to see the author's formula for Euclidian distance:
sum((x_i - y_i)^2) / n

The correct formula is:
sqrt(sum((x_i - y_i)^2))
(See http://en.wikipedia.org/wiki/Euclidean_distance if you don't believe me.)

How cann I trust that the part of the content that I'm not familiar with is accurate ? (I guess many reviewers say it's accurate, but they probaly also missed the formula in the teaser.)

Thanks.

 Gheorghe Muresan  Aug 19, 2011 
Other Digital Version 4
36:40

In the fourth video, "Clustering, Recommendations, and Probability", at
about 36:40, a participant asks about why the absolute value is taken
on the intersection and union of sets in the Jaccard index formula. It
should have been noted that the vertical bars do not indicate absolute
values, but rather the cardinality of the sets.

 Anonymous  Sep 01, 2012 
Other Digital Version 4
9:21

At 9:21 of the 4th video of the series ("Clustering"), the simple clustering code is missing a closed parenthesis at the end of the first line of code.

 Anonymous  Oct 04, 2013 
Other Digital Version 4
9:21

At 9:21 of the 4th video of the series ("Clustering"), the simple clustering code is missing imports needed for the code to execute properly. Add these lines to the top of the code:

#!/usr/bin/env python
# encoding: utf-8

import numpy
from Pycluster import *

 Anonymous  Oct 07, 2013 
Other Digital Version 4
38:07

'k-mediods' is misspelled. It should be 'k-medoids'. Reference section 3.4.2 of the C clustering library documentation found at http://bonsai.hgc.jp/~mdehoon/software/cluster/cluster.pdf.

 Anonymous  Oct 08, 2013