PCA与数据标准化

def solve():
    import numpy as np
    from sklearn.datasets import load_iris
    from sklearn.decomposition import PCA
    from sklearn.preprocessing import StandardScaler
    iris = load_iris()
    X = iris.data
    # 无标准化
    pca1 = PCA(____)
    X_pca1 = pca1.fit_transform(____)
    # 有标准化
    scaler = StandardScaler()
    X_s = scaler.fit_transform(____)
    pca2 = PCA(____)
    X_pca2 = pca2.fit_transform(____)
    print(____)