主成分分析基础

def solve():
    from sklearn.datasets import load_iris
    from sklearn.decomposition import PCA
    from sklearn.preprocessing import StandardScaler
    import numpy as np
    iris = load_iris()
    X = iris.data
    scaler = StandardScaler()
    X_s = scaler.fit_transform(____)
    pca = PCA()
    pca.fit(____)
    print(____)