"MPS is not normalized" when I try to PastaQ.getsamples(ψ, bases)

[Mi-Peng]

I got an error that "MPS is not normalized, norm=1.000000042243257" when I tried to PastaQ.getsamples(ψ, bases). I understand that the MPS norm should be 1, but I'm curious about the reason why the norm is not 1. Does the approximation of floating point numbers cause it, or is there something wrong with my code? In addition, the norm obtained by running my code is usually 1e-8 orders of magnitude different from 1. Could this error be larger? Thanks very much.

[mtfishman]

Probably the check is too strict. Can you try normalizing your MPS explicitly?

[Mi-Peng]

Probably the check is too strict. Can you try normalizing your MPS explicitly?

Thanks for your reply. I fix it by dividing by its norm,i.e., ψ=ψ / LinearAlgebra.norm(ψ), and then it doesn't raise any error. I'm not sure about the meaning of the check is too strict, since I didn't find something like eps in the docs. Actually, I'm curious about the reason and I can accept the current error, 1e-8, but I'm worried that this error could get larger in some extreme cases.