PCA-主成分可视化

def solve():
    import pandas as pd
    from sklearn.decomposition import PCA
    df = pd.read_csv('https://liangdaima.com/static/data/iris.csv')
    X = df.drop('species', axis=1)
    pca = PCA(n_components=2)
    X_pca = pca.fit_transform(X)
    print('前5个样本的主成分值:')
    print(X_pca[:5].round(4))