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telco_network_recovery: solver fallback handles non-OPTIMAL status #72

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telco_network_recovery: solver fallback handles non-OPTIMAL status #72

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9 changes: 9 additions & 0 deletions v1/telco_network_recovery/telco_network_recovery.py
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Original file line number Diff line number Diff line change
Expand Up @@ -853,6 +853,7 @@ def _pos_prob(p):
)

print(f"\n Solving (MIP solver: {MIP_SOLVER})...")
_used_solver = MIP_SOLVER
try:
problem.solve(solver=MIP_SOLVER)
except Exception as exc:
Expand All @@ -864,9 +865,17 @@ def _pos_prob(p):
"not found", "disabled", "install")
):
print(f" Gurobi unavailable ({exc}); falling back to solver='highs'.")
_used_solver = "highs"
problem.solve(solver="highs")
else:
raise
# A non-OPTIMAL solve does NOT raise — it returns a status. Catch a
# transient/failed gurobi solve (e.g. OTHER_ERROR on a cold call) here
# and retry on HiGHS so the chain still produces a plan.
if _used_solver == "gurobi" and problem.solve_info().termination_status != "OPTIMAL":
print(f" gurobi returned {problem.solve_info().termination_status}; "
f"retrying with solver='highs'.")
problem.solve(solver="highs")
problem.display()

# Extract selected upgrades. Cast int128 (returned by RAI select) to
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