There are variables X_train, X_test, y_train, y_test created through sklearn train_test_split. They contain text data in string format. Convert them to float numbers.

def cond_to_float(X_train, X_test, y_train, y_test):
    y_train = y_train.astype(np.float)
    y_test = y_test.astype(np.float)
    X_train = X_train.astype(np.float)
    X_test = X_test.astype(np.float)
    return (X_train, X_test, y_train, y_test)

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