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There was a question regarding the homework: “Clarification on #2: Are we
supposed to plot the precision and recall numbers after each document is
fetched in the query? My interpretation of the initial formulation seems to
yield only 1 point, which is a bit nonsensical for plotting a curve...” The answer is yes you should plot the precision/recall after
each relevant document is fetched. In the slides the frequently used
11-point precision/recall curve is shown…This is done by interpolating
and finding each of the eleven points…If you plot the curve for each
document (relevant or not) and don’t interpolate, you often times end up
with a saw tooth shaped curve… Garrett |