I also wonder how much my recent clustering changes have affected the
examples in the clustering sections. I know the book is currently aimed
at Mahout 0.3 but users trying the examples with trunk may be frustrated
by the recent changes in file naming. Do the examples exist in an
unannotated version somewhere that I could get working again on trunk?
On 4/23/10 9:10 AM, Sean Owen wrote:
Good eye, this was fixed in the manuscript a while ago.
I will ping Manning to re-publish Chapters 1-6 since a lot of small
updates have happened since then.
On Fri, Apr 23, 2010 at 4:53 PM, Jeff Eastman
<j...@windwardsolutions.com> wrote:
Section 4.5.1 says:
"The third line shows how it is based on item-item similarities, not
user-user similarities as before. The algorithms are similar, but not
entirely symmetric. They do have notably different properties. For instance,
the running time of an item-based recommender scales up as the number of
items increases, whereas a user-based recommender’s running time goes up as
the number of users increases.
This suggests one reason that you might choose an item-based recommender: if
the number of users is relatively low compared to the number of items, the
performance advantage could be significant."
Shouldn't the second paragraph be?
"This suggests one reason that you might choose an item-based recommender:
if the number of users is relatively *high* compared to the number of items,
the performance advantage could be significant."
