Hi, I'm trying to create item similarity.
I gather items which users visit during shopping and then create a file:
user_id, item_id, weight (where weight can be: [1.0, 1.6, 1.9], depends on
user action type and data source)
UNION
-item_id, item_id, 1.0 (from items dictionary)
and I do provide a us
I'm confused about how you're constructing the user file, and why there are
negated item ids here.
Can you post some more details please, including Mahout version and some sample
data sets?
> On Jul 20, 2014, at 11:57 AM, Serega Sheypak wrote:
>
> Hi, I'm trying to create item similarity.
> I
the version is: CDH-4.7.0-1.cdh4.7.0.p0.40
users_file:
--inverted_item_id
-1
-2
-3
-4
users_items_prefs
--inverted item_id
-1 1 1.0
-2 2 1.0
-3 3 1.0
-4 4 1.0
--user_id item_id pref_value
11 1 1.6
11 2 1.6
123 3 2.0
123 4 2.0
333 1 2.0
333 2 1.6
--e.t.c.
if I set --booleanData true
then mahou
All bad things happen here:
Name
RecommenderJob-PartialMultiplyMapper-Reducer
User
oozie
Process User
oozie
Group
oozie
Mapper Class
PartialMultiplyMapper
Reducer Class
AggregateAndRecommendReducer
Job Input Directory
hdfs://nameservice1/itemrec/temp/partialMultiply
Job Output Di
Seraga,
I have two comments:
1. Don’t use negative user ids. Since Mahout uses user id as well as item id as
the row/column index, you’d better use 0, 1, 2, etc as ids
2. If you want to get the item similarity information, you can use
--outputPathForSimilarityMatrix in the command
Regards,
Peng
