507 search results - page 73 / 102 » Portfolio theory of information retrieval |
SIGIR
2012
ACM
11 years 10 months ago
2012
ACM
In this paper, we propose a novel top-k learning to rank framework, which involves labeling strategy, ranking model and evaluation measure. The motivation comes from the difficul...
WSDM
2012
ACM
12 years 3 months ago
2012
ACM
It is well known that different types of social ties have essentially different influence between people. However, users in online social networks rarely categorize their contact...
WSDM
2012
ACM
12 years 3 months ago
2012
ACM
Traditionally, research about trust assumes a single type of trust between users. However, trust, as a social concept, inherently has many facets indicating multiple and heterogen...
CHI
2007
ACM
14 years 8 months ago
2007
ACM
Our lives are full of memorable and important moments, as well as important items of information. The last few years have seen the proliferation of digital devices intended to sup...
SAC
2008
ACM
13 years 7 months ago
2008
ACM
A major obstacle that decreases the performance of text classifiers is the extremely high dimensionality of text data. To reduce the dimension, a number of approaches based on rou...