Scaling the data

For ML algorithms using distance based metrics, it is crucial to always scale your data, as features using different scales will distort your results. K-means uses the Euclidian distance to assess distance to cluster centroids, therefore you first need to scale your data before continuing to implement the algorithm. Let's do that first.

Available is the dataframe df from the previous exercise, with some minor data preparation done so it is ready for you to use with sklearn. The fraud labels are separately stored under labels, you can use those to check the results later. numpy has been imported as np.

本练习是课程的一部分

Fraud Detection in Python

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练习说明

Import the MinMaxScaler.
Transform your dataframe df into a numpy array X by taking only the values of df and make sure you have all float values.
Apply the defined scaler onto X to obtain scaled values of X_scaled to force all your features to a 0-1 scale.

交互式实操练习

通过完成这段示例代码来试试这个练习。

# Import the scaler
from sklearn.preprocessing import ____

# Take the float values of df for X
X = df.values.astype(np.____)

# Define the scaler and apply to the data
scaler = ____()
X_scaled = scaler.____(X)

编辑并运行代码