I believe that instead of the condition to prove being E=-\left|V\right|, it should be E=-\left|E\right| instead.
Hello @EmGiXIII, welcome to the forum!
Yes, I think you’re correct, which would make E an unfortunate choice of notation for the number of edges. I’ll think of how to fix it and will update it soon 
Thank you for spotting this, you have great attention to detail!
Alvaro
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To evaluate ground state energy Here it is coming as -4. I could not fidured out where it went wrong
my_guess1 = np.array([1,0,1,1,1]) # MODIFY THIS
my_guess2 = np.array([1,0,1,1,0]) # MODIFY THIS
print("The expected energy for", my_guess1, "is", energy(my_guess1), ".")
print("The expected energy for", my_guess2, "is", energy(my_guess2), ".")
Hello @SUDHIR_KUMAR_SAHOO ,
my_guess1 gives an energy of -2, so it’s not the correct ground state! The my_guess2 is correct. There are two valid ground states, and you must find both.
Hope this helps!
Alvaro
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I have already done that thanks