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Checksum code for either even or odd Hamming weight.
openfermion.transforms.checksum_code( n_modes: int, odd: Union[int, bool] ) ->
The Hamming weight is defined such that it yields the total occupation number for a given basis state. A Checksum code with odd weight will encode all states with odd occupation number. This code saves one qubit: n_qubits = n_modes - 1.
number of modes
1 (True) or 0 (False), if odd, we encode all states with odd Hamming weight
Returns (BinaryCode): The checksum BinaryCode