Merge pull request #271 from OpenBioSim/fix_269

Fix #269

src/sire/qm/_emle.py

@@ -225,23 +225,10 @@ def emle(
 
     # Create an engine from an EMLE calculator.
     if isinstance(calculator, _EMLECalculator):
-        # Determine the callback name. Use an optimised version of the callback
-        # if the user has specified "torchani" as the backend and is using
-        # "electrostatic" embedding.
-        if calculator._backend == "torchani" and calculator._method == "electrostatic":
-            try:
-                from emle.models import ANI2xEMLE as _ANI2xEMLE
-
-                callback = "_sire_callback_optimised"
-            except:
-                callback = "_sire_callback"
-        else:
-            callback = "_sire_callback"
-
         # Create the EMLE engine.
         engine = EMLEEngine(
             calculator,
-            callback,
+            "_sire_callback",
             cutoff,
             neighbour_list_frequency,
             False,