examples/healthcare/data/cardiovascular.py

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import numpy as np
import warnings
warnings.filterwarnings("ignore", category=DeprecationWarning)
from sklearn.model_selection import train_test_split
from sklearn.compose import ColumnTransformer
from sklearn.preprocessing import StandardScaler, OneHotEncoder
from sklearn.impute import SimpleImputer
from sklearn.pipeline import Pipeline

def load_cardio_data(file_path):

    data = np.genfromtxt(file_path, delimiter=',', skip_header=0)

    continuous_cols = [0, 2, 3, 4, 5]    
    binary1_col = [1]                    
    ternary_cols = [6, 7]                
    binary2_cols = [8, 9, 10]            
    
    X = data[:, :-1]
    y = data[:, -1]
    
    X_train, X_val, y_train, y_val = train_test_split(
        X, y, test_size=0.2, random_state=42, shuffle=False
    )
    

    preprocessor = ColumnTransformer(
        transformers=[
            ('cont', Pipeline([
                ('imputer', SimpleImputer(strategy='mean')),
                ('scaler', StandardScaler())
            ]), continuous_cols),
            ('binary1', Pipeline([
                ('imputer', SimpleImputer(strategy='most_frequent')),
                ('onehot', OneHotEncoder(sparse_output=False, drop=None))
            ]), binary1_col),
            ('ternary', Pipeline([
                ('imputer', SimpleImputer(strategy='most_frequent')),
                ('onehot', OneHotEncoder(sparse_output=False, drop=None))
            ]), ternary_cols),
            ('binary2', Pipeline([
                ('imputer', SimpleImputer(strategy='most_frequent')),
                ('onehot', OneHotEncoder(sparse_output=False, drop=None))
            ]), binary2_cols)
        ],
        remainder='drop'
    )
    

    X_train_processed = preprocessor.fit_transform(X_train)
    X_val_processed = preprocessor.transform(X_val)
    
    return X_train_processed, y_train, X_val_processed, y_val
   
def load(file_path):
    
    
    try:
        X_train, y_train, X_val, y_val = load_cardio_data(file_path)
    except FileNotFoundError:
        raise SystemExit(f"Error：File {file_path} is not found.")
    

    X_train = X_train.astype(np.float32)
    X_val = X_val.astype(np.float32)
    y_train = y_train.astype(np.int32)
    y_val = y_val.astype(np.int32)
    
    
    return X_train, y_train, X_val, y_val