确定因子数量

def solve():
    import numpy as np
    from sklearn.datasets import load_iris
    from sklearn.preprocessing import StandardScaler
    from sklearn.decomposition import FactorAnalysis
    iris = load_iris()
    X = iris.data
    scaler = StandardScaler()
    X_s = scaler.fit_transform(____)
    # Kaiser准则：特征值>____
    cov_matrix = np.cov(____)
    eigenvalues = np.linalg.eigvals(____)
    n_factors = np.sum(____)
    print(____)