Performance Improvements #32
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igrigorik
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Apr 11, 2017
lib/core_extensions/array.rb
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| result[i] += 1 | ||
| end.values.inject(0) do |sum, count| | ||
| percentage = count.to_f / length | ||
| sum + -percentage * Math.log2(percentage) |
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I guess we can simplify to sum - ...? :)
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Good point! Fixed here and in another place in id3_tree.rb
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I was using the Bagging with a large amount of data and it was really slow. I've made some improvements (though it's still pretty slow ;).
The biggest improvement was pulling out the
index = attributes.index(attribute)so that it didn't happen over and over again in each loop.It also seemed like the
fitnessvariable was being used, but I was only using thediscrete. I'm happy to put that back if that's not true forcontinuous