In the QUBO dictionary parameter, if any one of the keys is not an iterable of length 2, dimod.qubo_to_ising(Q, offset=0.0) will throw the above error. For example, Q = {('a', 'a'): 1, ('b', 'b'): 1, ('c','c'):1, ('a', 'b','c'): 1}; here the key ('a', 'b','c') is a 3 valued tuple and will generate the error.
You’ll also get the above error if you perform an incorrect return operation, such as h, J = qubo_to_ising(Q) rather than h, J, offset = qubo_to_ising(Q). In this case, the number of values expected to be returned does not match the number actually returned.
I hope this helps! Please let me know if you have any other questions.
Comments
Hi Ramy,
In the QUBO dictionary parameter, if any one of the keys is not an iterable of length 2, dimod.qubo_to_ising(Q, offset=0.0) will throw the above error. For example, Q = {('a', 'a'): 1, ('b', 'b'): 1, ('c','c'):1, ('a', 'b','c'): 1}; here the key ('a', 'b','c') is a 3 valued tuple and will generate the error.
You’ll also get the above error if you perform an incorrect return operation, such as h, J = qubo_to_ising(Q) rather than h, J, offset = qubo_to_ising(Q). In this case, the number of values expected to be returned does not match the number actually returned.
I hope this helps! Please let me know if you have any other questions.
Thanks @...! The error was solved.
I'm currently working on implementing the algorithm discussed in the following paper:
https://arxiv.org/pdf/2001.04014.pdf
I'm confused with how to code equation (12) in appendix B.
I would really appreciate it if you could help me with it.
Regards
Hi Ramy,
This question has been previously posted here: https://support.dwavesys.com/hc/en-us/community/posts/4406225748119-Embedding-Ising-
Please follow the above thread for its answer. Thank you.
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