文章：快速生成Kernel Matrix，文章链接：http://www.scutmath.com/fast_kernel_matrix_generation.html

kmg.ipynb

When recreating the function method1, I encounter an error message: "setting array with a sequence" on the line of code:

mat[i, j] = np.exp(-0.5 / sigma**2 * np.dot(vec, vec))

Would you like to verify the version of the code to recreate my problem?

Thank you in advance for considering my question,

Haocheng