data_generation.py 文件源码

def gen_blurred_diag_pxy(s):
    X = 1024
    Y = X

    # generate pdf
    from scipy.stats import multivariate_normal
    pxy = np.zeros((X,Y))
    rv = multivariate_normal(cov=s)
    for x in range(X):        
        pxy[x,:] = np.roll(rv.pdf(np.linspace(-X/2,X/2,X+1)[:-1]),int(X/2+x))
    pxy = pxy/np.sum(pxy)

    # plot p(x,y)
    import matplotlib.pyplot as plt
    plt.figure()
    plt.contourf(pxy)
    plt.ion()
    plt.title("p(x,y)")
    plt.show()

    return pxy