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Machine Learning in Elixir: query on normalising data between 0..1 (page 5)

Chris660

Chris660

Machine Learning in Elixir: query on normalising data between 0..1 (page 5)

This didn’t seem right to me:

For instance, you can squeeze the values of a feature between 0 and 1 by dividing every individual feature by the max value of that feature column and then subtracting by the min value.

To ensure the whole 0…1 range is used, don’t you want to first subtract the minimum value in the column (baseline to 0), then divide by the resulting maximum value?

Effectively:

normalised = (value - min) / (max - min)
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First Post!

seanmor5

seanmor5

Author of Genetic Algorithms in Elixir

The wording is incorrect in the book. It’s supposed to be min-max scaling which matches the equation you’ve written. I’ve marked it to get updated :slight_smile:

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