Notes
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Inputs: ⟨Dataset⟩ D; ⟨Percentage⟩ P
Outputs: Preprocessed dataset
1: samplesToDelete’jDj =100nP ▹ P% size reduction
2: ▹ Group samples according to their labelsets
3: for i ¼ 1-j labelsetsj do
4: labelSetBagi’samplesWithLabelsetðiÞ
5: end for
6: ▹ Calculate the average number of samples per labelset
7:
meanSize’1=j labelsetsj n
j labelsets P
j
i ¼ 1
j labelSetBagi j
8: ▹ Obtain majority labels bags
9: for each labelSetBagi in labelSetBag do
10: if j labelSetBagi j 4meanSize then
11: majBagi’labelSetBagi
12: end if
13: end for
14: meanRed’samplesToDelete=j majBagj
15: majBag’ SortFromSmallestToLargest(majBag)
16: ▹ Calculate # of instances to delete and remove them
17: for each majBagi in majBag do
18: rBagi’minðj majBagi j meanSize; meanRedÞ
19: remainder’meanRedrBagi
20: distributeAmongBagsj4iðremainderÞ
21: for n ¼ 1-rBagi do
22: x’randomð1; j majBagi j Þ
23: deleteSampleðmajBagi; xÞ
24: end for
25: end for
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