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Fix sum error

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Sam Oliver
2021-09-17 13:00:14 +02:00
parent aad3b61d10
commit a58ec254f6
1 changed files with 2 additions and 2 deletions
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4
lib/decisiontree/id3_tree.rb
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@@ -127,12 +127,12 @@ module DecisionTree
index = attributes.index(attribute)
values = data.map { |row| row[index] }.uniq
remainder = values.sort.inject(0, :+) do |val|
remainder = values.sort.inject(0) do |sum, val|
classification = data.each_with_object([]) do |row, result|
result << row.last if row[index] == val
end
((classification.size.to_f / data.size) * classification.entropy)
sum + ((classification.size.to_f / data.size) * classification.entropy)
end
[data.classification.entropy - remainder, index]