Work around for issue watertap-org/watertap#1312 (watertap-org/watert…

…ap#1316)

* try switching to MultiProcessing

* updating tutorial comment

* default to multiprocessing; make interface more forgiving

src/parameter_sweep/parallel/parallel_manager_factory.py

@@ -47,12 +47,12 @@ def create_parallel_manager(parallel_manager_class=None, **kwargs):
 
     number_of_subprocesses = kwargs.get("number_of_subprocesses", 1)
     if should_fan_out(number_of_subprocesses):
-        parallel_backend = kwargs.get("parallel_back_end", "ConcurrentFutures")
-        if parallel_backend == "ConcurrentFutures":
+        parallel_backend = kwargs.get("parallel_back_end", "multiprocessing")
+        if parallel_backend.lower() in ("concurrentfutures", "concurrent.futures"):
             return ConcurrentFuturesParallelManager(number_of_subprocesses)
-        elif parallel_backend == "MultiProcessing":
+        elif parallel_backend.lower() in ("multiprocessing",):
             return MultiprocessingParallelManager(number_of_subprocesses)
-        elif parallel_backend == "RayIo":
+        elif parallel_backend.lower() in ("rayio", "ray"):
             if ray_avaialble:
                 return RayIoParallelManager(number_of_subprocesses)
             else:

tutorials/parameter_sweep_demo.ipynb

@@ -221,7 +221,7 @@
     "        \"optimize_kwargs\": {\"solver\": solver, \"check_termination\": False},\n",
     "        \"initialize_function\": None,\n",
     "        \"initialize_kwargs\": {},\n",
-    "        \"parallel_back_end\": \"ConcurrentFutures\", # Multiprocessing, MPI, Ray available\n",
+    "        \"parallel_back_end\": \"MultiProcessing\", # ConcurrentFutures, MPI, Ray available\n",
     "        \"number_of_subprocesses\": num_procs,\n",
     "        \n",
     "        # Additional useful keyword arguments\n",