public final class ToItemPrefsMapper extends ToEntityPrefsMapper
Intended for use with TextInputFormat
;
accepts line number / line pairs as
LongWritable
/Text
pairs.
Each line is assumed to be of the form userID,itemID,preference
, or userID,itemID
.
Outputs the user ID as a VarLongWritable
mapped to the item ID and preference as a
EntityPrefWritable
.
RATING_SHIFT, TRANSPOSE_USER_ITEM
Constructor and Description |
---|
ToItemPrefsMapper() |
map, setup
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