Merge pull request #781 from SciML/Vaibhavdixit02-patch-1

Add another lbfgsb stopping criteria for retcode handling

Author: ChrisRackauckas

src/utils.jl

@@ -76,6 +76,7 @@ const STOP_REASON_MAP = Dict(
     r"Delta fitness .* below tolerance .*" => ReturnCode.Success,
     r"Fitness .* within tolerance .* of optimum" => ReturnCode.Success,
     r"CONVERGENCE: NORM_OF_PROJECTED_GRADIENT_<=_PGTOL" => ReturnCode.Success,
+    r"Unrecognized stop reason: CONVERGENCE: REL_REDUCTION_OF_F_<=_FACTR*EPSMCH" => ReturnCode.Success, 
     r"Terminated" => ReturnCode.Terminated,
     r"MaxIters|MAXITERS_EXCEED|Max number of steps .* reached" => ReturnCode.MaxIters,
     r"MaxTime|TIME_LIMIT" => ReturnCode.MaxTime,