?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rft.title=The+identification+of+context-sensitive+features%3A+A+formal+definition+of+context+for+concept+learning&rft.creator=Turney%2C+Peter&rft.subject=Artificial+Intelligence&rft.subject=Machine+Learning&rft.subject=Statistical+Models&rft.description=A+large+body+of+research+in+machine+learning+is+concerned+with+supervised+learning+from+examples.+The+examples+are+typically+represented+as+vectors+in+a+multi-+dimensional+feature+space+(also+known+as+attribute-value+descriptions).+A+teacher+partitions+a+set+of+training+examples+into+a+finite+number+of+classes.+The+task+of+the+learning+algorithm+is+to+induce+a+concept+from+the+training+examples.+In+this+paper%2C+we+formally+distinguish+three+types+of+features%3A+primary%2C+contextual%2C+and+irrelevant+features.+We+also+formally+define+what+it+means+for+one+feature+to+be+context-sensitive+to+another+feature.+Context-sensitive+features+complicate+the+task+of+the+learner+and+potentially+impair+the+learner's+performance.+Our+formal+definitions+make+it+possible+for+a+learner+to+automatically+identify+context-sensitive+features.+After+context-sensitive+features+have+been+identified%2C+there+are+several+strategies+that+the+learner+can+employ+for+managing+the+features%3B+however%2C+a+discussion+of+these+strategies+is+outside+of+the+scope+of+this+paper.+The+formal+definitions+presented+here+correct+a+flaw+in+previously+proposed+definitions.+We+discuss+the+relationship+between+our+work+and+a+formal+definition+of+relevance.+%0A%0A&rft.date=1996&rft.type=Conference+Paper&rft.type=PeerReviewed&rft.format=application%2Fpdf&rft.identifier=http%3A%2F%2Fcogprints.org%2F1866%2F3%2FNRC-39222.pdf&rft.identifier=++Turney%2C+Peter++(1996)+The+identification+of+context-sensitive+features%3A+A+formal+definition+of+context+for+concept+learning.++%5BConference+Paper%5D+++++&rft.relation=http%3A%2F%2Fcogprints.org%2F1866%2F