Error when loading a model with some decision states uninitialized

[arcondello]

from dwave.optimization import Model

model = Model()

_, sets = model.disjoint_bit_sets(10, 5)
inp = model.input((3,), lower_bound=0, upper_bound=10, integral=True)

model.lock()

model.states.resize(1)

inp.set_state(0, [5, 6, 4])

with model.to_file(max_num_states=1) as f:
    Model.from_file(f)

KeyError: "There is no item named 'nodes/0/states/0/set0' in the archive"

[arcondello]

Workaround is just to read the state of all of the decision variables (or any variable that's a successor of the decision variables). That will initialize the state to the default value and avoid the error.

from dwave.optimization import Model

model = Model()

_, sets = model.disjoint_bit_sets(10, 5)
inp = model.input((3,), lower_bound=0, upper_bound=10, integral=True)

model.lock()

model.states.resize(1)

sets[0].state()  # initializes the state of the disjoint bit sets
inp.set_state(0, [5, 6, 4])

with model.to_file(max_num_states=1) as f:
    Model.from_file(f)