Hydra-Sklearn Blog - Code example 1

standard_pre_processing_pipeline.py

from sklearn.feature_selection import VarianceThreshold
from sklearn.impute import SimpleImputer
from sklearn.pipeline import Pipeline
from sklearn.preprocessing import StandardScaler

num_pipeline = Pipeline(
    [
        ("scaler", StandardScaler()),
        ("VarianceThreshold", VarianceThreshold(threshold=0.1)),
        ("imputer", SimpleImputer(strategy="constant", fill_value="-1")),
    ]
)