Patents by Inventor Liadan O'Callaghan

Liadan O'Callaghan has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 6907380
    Abstract: A technique that uses a weighted divide and conquer approach for clustering a set S of n data points to find k final centers. The technique comprises 1) partitioning the set S into P disjoint pieces S1, . . . , Sp; 2) for each piece Si, determining a set Di of k intermediate centers; 3) assigning each data point in each piece Si to the nearest one of the k intermediate centers; 4) weighting each of the k intermediate centers in each set Di by the number of points in the corresponding piece Si assigned to that center; and 5) clustering the weighted intermediate centers together to find said k final centers, the clustering performed using a specific error metric and a clustering method A.
    Type: Grant
    Filed: December 1, 2003
    Date of Patent: June 14, 2005
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Nina Mishra, Liadan O'Callaghan, Sudipto Guha, Rajeev Motwani
  • Publication number: 20040122797
    Abstract: A technique that uses a weighted divide and conquer approach for clustering a set S of n data points to find k final centers. The technique comprises 1) partitioning the set S into P disjoint pieces S1, . . . , Sp; 2) for each piece Si, determining a set Di of k intermediate centers; 3) assigning each data point in each piece Si to the nearest one of the k intermediate centers; 4) weighting each of the k intermediate centers in each set Di by the number of points in the corresponding piece Si assigned to that center; and 5) clustering the weighted intermediate centers together to find said k final centers, the clustering performed using a specific error metric and a clustering method A.
    Type: Application
    Filed: December 1, 2003
    Publication date: June 24, 2004
    Inventors: Nina Mishra, Liadan O?apos; Callaghan, Sudipto Guha, Rajeev Motwani
  • Patent number: 6684177
    Abstract: A technique that uses a weighted divide and conquer approach for clustering a set S of n data points to find k final centers. The technique comprises 1) partitioning the set S into P disjoint pieces S1, . . . , SP; 2) for each piece Si, determining a set Di of k intermediate centers; 3) assigning each data point in each piece Si to the nearest one of the k intermediate centers; 4) weighting each of the k intermediate centers in each set Di by the number of points in the corresponding piece Si assigned to that center; and 5) clustering the weighted intermediate centers together to find said k final centers, the clustering performed using a specific error metric and a clustering method A.
    Type: Grant
    Filed: May 10, 2001
    Date of Patent: January 27, 2004
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Nina Mishra, Liadan O'Callaghan, Sudipto Guha, Rajeev Motwani
  • Publication number: 20020183966
    Abstract: A technique that uses a weighted divide and conquer approach for clustering a set S of n data points to find k final centers. The technique comprises 1) partitioning the set S into P disjoint pieces S1, . . . , SP; 2) for each piece S1, determining a set D1 of k intermediate centers; 3) assigning each data point in each piece Si to the nearest one of the k intermediate centers; 4) weighting each of the k intermediate centers in each set D1 by the number of points in the corresponding piece S1 assigned to that center; and 5) clustering the weighted intermediate centers together to find said k final centers, the clustering performed using a specific error metric and a clustering method A.
    Type: Application
    Filed: May 10, 2001
    Publication date: December 5, 2002
    Inventors: Nina Mishra, Liadan O'Callaghan, Sudipto Guha, Rajeev Motwani