GQE automatically parallelizes workload via MPI

[melody-ren]

cudaq.mpi.is_initialized() always returns true in the current GQE implementation. Should look into the cause of this and allow user to turn MPI off if they so choose.

[anaamansari]

Hi,
I brought this issue to @marwafar. Here is a trace script that indicates that its likely embedded in cudaqlib._pycudaqlib. You can use the following to trace the import related issue.

print("Before any imports")
print("MPI initialized:", "Not checked yet")

print("\nImporting cudaq")
import cudaq
print("After importing cudaq")
print("MPI initialized:", cudaq.mpi.is_initialized())

print("\nImporting cudaqlib._pycudaqlib")
try:
    import cudaqlib._pycudaqlib
    print("Successfully imported cudaqlib._pycudaqlib")
except ImportError as e:
    print(f"Failed to import cudaqlib._pycudaqlib: {e}")
print("MPI initialized:", cudaq.mpi.is_initialized())

print("\nImporting cudaqlib.kernels")
try:
    import cudaqlib.kernels
    print("Successfully imported cudaqlib.kernels")
except ImportError as e:
    print(f"Failed to import cudaqlib.kernels: {e}")
print("MPI initialized:", cudaq.mpi.is_initialized())

print("\nImporting cudaqlib.algorithms.gqe")
try:
    import cudaqlib.algorithms.gqe
    print("Successfully imported cudaqlib.algorithms.gqe")
except ImportError as e:
    print(f"Failed to import cudaqlib.algorithms.gqe: {e}")
print("MPI initialized:", cudaq.mpi.is_initialized())

print("\nFinally importing cudaqlib")
import cudaqlib
print("After importing cudaqlib")
print("MPI initialized:", cudaq.mpi.is_initialized())