Resolve build infrastructure errors (with mpi4py, gams, networkx)

.github/workflows/test_branches.yml

@@ -92,7 +92,7 @@ jobs:
           skip_doctest: 1
           TARGET: linux
           PYENV: conda
-          PACKAGES: mpi4py openmpi
+          PACKAGES: mpi4py
 
         - os: ubuntu-latest
           python: '3.10'
@@ -318,6 +318,8 @@ jobs:
             fi
         done
         echo "*** Install Pyomo dependencies ***"
+        # Note: this will fail the build if any installation fails (or
+        # possibly if it outputs messages to stderr)
         conda install --update-deps -q -y $CONDA_DEPENDENCIES
         if test -z "${{matrix.slim}}"; then
             PYVER=$(echo "py${{matrix.python}}" | sed 's/\.//g')
@@ -334,7 +336,7 @@ jobs:
                 echo "$_PKGLIST"
                 _BASE=$(echo "$PKG" | sed 's/[=<>].*//')
                 _BUILDS=$(echo "$_PKGLIST" | grep "^$_BASE " \
-                    | sed -r 's/\s+/ /g' | cut -d\  -f3) || echo ""x
+                    | sed -r 's/\s+/ /g' | cut -d\  -f3) || echo ""
                 if test -n "$_BUILDS"; then
                     _ISPY=$(echo "$_BUILDS" | grep "^py") \
                         || echo "No python build detected"
@@ -623,7 +625,8 @@ jobs:
         # is fully generated by a single process before invoking MPI
         $PYTHON_EXE -c "from pyomo.dataportal.parse_datacmds import \
             parse_data_commands; parse_data_commands(data='')"
-        mpirun -np ${{matrix.mpi}} --oversubscribe pytest -v \
+        # Note: if we are testing with openmpi, add '--oversubscribe'
+        mpirun -np ${{matrix.mpi}} pytest -v \
             --junit-xml=TEST-pyomo-mpi.xml \
             -m "mpi" -W ignore::Warning \
             pyomo `pwd`/pyomo-model-libraries

.github/workflows/test_pr_and_main.yml

@@ -93,7 +93,7 @@ jobs:
           skip_doctest: 1
           TARGET: linux
           PYENV: conda
-          PACKAGES: mpi4py openmpi
+          PACKAGES: mpi4py
 
         - os: ubuntu-latest
           python: 3.11
@@ -348,6 +348,8 @@ jobs:
             fi
         done
         echo "*** Install Pyomo dependencies ***"
+        # Note: this will fail the build if any installation fails (or
+        # possibly if it outputs messages to stderr)
         conda install --update-deps -q -y $CONDA_DEPENDENCIES
         if test -z "${{matrix.slim}}"; then
             PYVER=$(echo "py${{matrix.python}}" | sed 's/\.//g')
@@ -653,7 +655,8 @@ jobs:
         # is fully generated by a single process before invoking MPI
         $PYTHON_EXE -c "from pyomo.dataportal.parse_datacmds import \
             parse_data_commands; parse_data_commands(data='')"
-        mpirun -np ${{matrix.mpi}} --oversubscribe pytest -v \
+        # Note: if we are testing with openmpi, add '--oversubscribe'
+        mpirun -np ${{matrix.mpi}} pytest -v \
             --junit-xml=TEST-pyomo-mpi.xml \
             -m "mpi" -W ignore::Warning \
             pyomo `pwd`/pyomo-model-libraries

pyomo/contrib/pynumero/examples/tests/test_mpi_examples.py

@@ -7,26 +7,28 @@
 )
 
 SKIPTESTS = []
-if numpy_available and scipy_available:
-    pass
-else:
-    SKIPTESTS.append("Pynumero needs scipy and numpy>=1.13.0 to run BlockMatrix tests")
+if not numpy_available:
+    SKIPTESTS.append("Pynumero needs numpy>=1.13.0 to run BlockMatrix tests")
+if not scipy_available:
+    SKIPTESTS.append("Pynumero needs scipy to run BlockMatrix tests")
 
 try:
     from mpi4py import MPI
 
     comm = MPI.COMM_WORLD
     if comm.Get_size() != 3:
-        SKIPTESTS.append("Pynumero MPI examples require exactly 3 processes")
+        SKIPTESTS.append(
+            f"Pynumero MPI examples require 3 MPI processes (got {comm.Get_size()})"
+        )
 except ImportError:
-    SKIPTESTS.append("Pynumero MPI examples require exactly 3 processes")
+    SKIPTESTS.append("Pynumero MPI examples require mpi4py")
 
 if not SKIPTESTS:
     from pyomo.contrib.pynumero.examples import parallel_vector_ops, parallel_matvec
 
 
 @unittest.pytest.mark.mpi
-@unittest.skipIf(SKIPTESTS, SKIPTESTS)
+@unittest.skipIf(SKIPTESTS, "\n".join(SKIPTESTS))
 class TestExamples(unittest.TestCase):
     def test_parallel_vector_ops(self):
         z1_local, z2, z3 = parallel_vector_ops.main()

pyomo/solvers/plugins/solvers/GAMS.py

@@ -250,7 +250,11 @@
         self.available()
 
         from gams import GamsWorkspace, DebugLevel
-        from gams.workspace import GamsExceptionExecution
+
+        try:
+            from gams import GamsExceptionExecution
+        except ImportError:
+            from gams.workspace import GamsExceptionExecution
 
         if len(args) != 1:
             raise ValueError(

pyomo/solvers/tests/checks/test_GAMS.py

@@ -31,7 +31,10 @@
 opt_py = SolverFactory('gams', solver_io='python')
 gamspy_available = opt_py.available(exception_flag=False)
 if gamspy_available:
-    from gams.workspace import GamsExceptionExecution
+    try:
+        from gams import GamsExceptionExecution
+    except:
+        from gams.workspace import GamsExceptionExecution
 
 opt_gms = SolverFactory('gams', solver_io='gms')
 gamsgms_available = opt_gms.available(exception_flag=False)

setup.py

@@ -166,9 +166,30 @@ def run(self):
         print(' '.join(deps))
 
     def _print_deps(self, deplist):
+        class version_cmp(object):
+            ver = tuple(map(int, platform.python_version_tuple()[:2]))
+
+            def __lt__(self, other):
+                return self.ver < tuple(map(int, other.split('.')))
+
+            def __le__(self, other):
+                return self.ver <= tuple(map(int, other.split('.')))
+
+            def __gt__(self, other):
+                return not self.__le__(other)
+
+            def __ge__(self, other):
+                return not self.__lt__(other)
+
+            def __eq__(self, other):
+                return self.ver == tuple(map(int, other.split('.')))
+
+            def __ne__(self, other):
+                return not self.__eq__(other)
+
         implementation_name = sys.implementation.name
         platform_system = platform.system()
-        python_version = '.'.join(platform.python_version_tuple()[:2])
+        python_version = version_cmp()
         for entry in deplist:
             dep, _, condition = (_.strip() for _ in entry.partition(';'))
             if condition and not eval(condition):
@@ -242,7 +263,12 @@ def _print_deps(self, deplist):
             # Note: matplotlib 3.6.1 has bug #24127, which breaks
             # seaborn's histplot (triggering parmest failures)
             'matplotlib!=3.6.1',
-            'networkx',  # network, incidence_analysis, community_detection
+            # network, incidence_analysis, community_detection
+            # Note: networkx 3.2 is Python>-3.9, but there is a broken
+            # 3.2 package on conda-forgethat will get implicitly
+            # installed on python 3.8
+            'networkx<3.2; python_version<"3.9"',
+            'networkx; python_version>="3.9"',
             'numpy',
             'openpyxl',  # dataportals
             #'pathos',   # requested for #963, but PR currently closed