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Leer MaxAbsScaler | Scaling Numerical Data
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MaxAbsScaler

To bring values into range [-1, 1] we have to use the next formula:

Here we have the following values:

  • x_scaled - normalized feature element,

  • x - unnormalized feature element,

  • max(x) -- maximum feature element.

There is a function in the sklearn library that normalizes data according to the formula given above: MaxAbsScaler(). In order to work with this function, it must first be imported in such a way:

1
from sklearn.preprocessing import MaxAbsScaler
copy

Let's look at an example of how we apply this normalization to a very simple array.

12345678910
from sklearn.preprocessing import MaxAbsScaler data = [[10, 5, -6],[11, -9, 4],[-10, 0, 1]] # Normalizer initialization scaler = MaxAbsScaler() # Dataset transfer and transformation scaler.fit(data) scaled_data = scaler.transform(data) print('Data before normalization', data) print('Data after normalization', scaled_data)
copy

If you run this code you will get two different arrays: before and after normalization. And this function really works, because you can make sure that data after using MaxAbsScaler() function really lie within an interval [-1, 1]. Look below.v

It's time to practice!

Taak

Swipe to start coding

You have a numpy array. Please, normalize this array into range [-1, 1].

Oplossing

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book
MaxAbsScaler

To bring values into range [-1, 1] we have to use the next formula:

Here we have the following values:

  • x_scaled - normalized feature element,

  • x - unnormalized feature element,

  • max(x) -- maximum feature element.

There is a function in the sklearn library that normalizes data according to the formula given above: MaxAbsScaler(). In order to work with this function, it must first be imported in such a way:

1
from sklearn.preprocessing import MaxAbsScaler
copy

Let's look at an example of how we apply this normalization to a very simple array.

12345678910
from sklearn.preprocessing import MaxAbsScaler data = [[10, 5, -6],[11, -9, 4],[-10, 0, 1]] # Normalizer initialization scaler = MaxAbsScaler() # Dataset transfer and transformation scaler.fit(data) scaled_data = scaler.transform(data) print('Data before normalization', data) print('Data after normalization', scaled_data)
copy

If you run this code you will get two different arrays: before and after normalization. And this function really works, because you can make sure that data after using MaxAbsScaler() function really lie within an interval [-1, 1]. Look below.v

It's time to practice!

Taak

Swipe to start coding

You have a numpy array. Please, normalize this array into range [-1, 1].

Oplossing

Switch to desktopSchakel over naar desktop voor praktijkervaringGa verder vanaf waar je bent met een van de onderstaande opties
Was alles duidelijk?

Hoe kunnen we het verbeteren?

Bedankt voor je feedback!

Sectie 2. Hoofdstuk 2
Switch to desktopSchakel over naar desktop voor praktijkervaringGa verder vanaf waar je bent met een van de onderstaande opties
Onze excuses dat er iets mis is gegaan. Wat is er gebeurd?
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