Merge pull request #3683 from AnhTran01/GAMS_new_solver_interface

New GAMS solver interface, writer, and solution loader.

Author: blnicho

doc/OnlineDocs/explanation/experimental/solvers.rst

@@ -57,6 +57,9 @@ with existing interfaces).
    * - KNITRO
      - ``knitro_direct``
      - ``knitro_direct``
+   * - GAMS
+     - ``gams``
+     - ``gams_v2``
 
 Using the new interfaces through the legacy interface
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

pyomo/contrib/solver/plugins.py

@@ -14,6 +14,7 @@
 from .solvers.gurobi.gurobi_persistent import GurobiPersistent
 from .solvers.gurobi.gurobi_direct_minlp import GurobiDirectMINLP
 from .solvers.highs import Highs
+from .solvers.gams import GAMS
 from .solvers.knitro.direct import KnitroDirectSolver
 
 
@@ -39,6 +40,9 @@ def load():
     SolverFactory.register(
         name="highs", legacy_name="highs", doc="Persistent interface to HiGHS"
     )(Highs)
+    SolverFactory.register(name='gams', legacy_name='gams_v2', doc='Interface to GAMS')(
+        GAMS
+    )
     SolverFactory.register(
         name="knitro_direct",
         legacy_name="knitro_direct",