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what does scalar.fit do

from sklearn.preprocessing import StandardScaler
scaler = StandardScaler()
x_train = scaler.fit(x_train) # calc mean & variance of each of the features
x_train = scaler.transform(x_train) # transform features using mean & variance 
x_train = scaler.fit_transform(x_train) # or just do both at once using this

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what does scalar.fit do

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