something wrong with rescale_L

[tadpole]

To rescale Laplacian eigenvalues to [-1, 1], the formula should be $L' = 2L/l_max - I$.
I think the 33-th line in corsening.py should be like follows:

L /= lmax / 2

[zhujiagang]

@tadpole Your meaning is right, but your implementation may not be general. Perhaps it's the version of python or numpy that actually matters.
I change the original version to L = 2 * L / lmax , a possible version that is applicable to any version of code, the accuracy could achieve 99.080%.
But with your version L /= lmax / 2, loss could be nan and accuracy could be around 11%.