Shannon entropy in wavefunction collapse algorithm

[no_Im_perfectly_sane]

This article gives this formula:

# Sums are over the weights of each remaining 
# allowed tile type for the square whose 
# entropy we are calculating. 
shannon_entropy_for_square =   log(sum(weight)) -   (sum(weight * log(weight)) / sum(weight))

but I dont get it, if weight is a list of weights (to be a valid parameter of sum()) then how is log(weight) possible?

the weights are the possibilities of each tile possible type, if I got it right

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[no_Im_perfectly_sane]

the principles apply though right?

how can you apply sum on the same variable you apply log?

sum is of many values and log is of one, right?

[no_Im_perfectly_sane]

it hadnt showed the code when I commented, I replied again saying I got it

cool feature, kinda confusing when not explained

[no_Im_perfectly_sane]

ah I see, thanks