fixing dpnp failure caused by addition of nin, nout and ntypes

numba_dpex/dpnp_iface/dpnp_ufunc_db.py

@@ -72,20 +72,23 @@ def _fill_ufunc_db_with_dpnp_ufuncs(ufunc_db):
                 "d->d": mathimpl.lower_ocl_impl[("erf", (_unary_d_d))],
             }
         else:
-            op = getattr(dpnp, ufuncop)
+            dpnpop = getattr(dpnp, ufuncop)
             npop = getattr(np, ufuncop)
-            op.nin = npop.nin
-            op.nout = npop.nout
-            op.nargs = npop.nargs
-            op.types = npop.types
-            op.is_dpnp_ufunc = True
+            if not hasattr(dpnpop, "nin"):
+                dpnpop.nin = npop.nin
+            if not hasattr(dpnpop, "nout"):
+                dpnpop.nout = npop.nout
+            dpnpop.nargs = dpnpop.nin + dpnpop.nout
+            if not hasattr(dpnpop, "types"):
+                dpnpop.types = npop.types
+            dpnpop.is_dpnp_ufunc = True
             cp = copy.copy(_ufunc_db[npop])
-            ufunc_db.update({op: cp})
-            for key in list(ufunc_db[op].keys()):
+            ufunc_db.update({dpnpop: cp})
+            for key in list(ufunc_db[dpnpop].keys()):
                 if (
                     "FF->" in key
                     or "DD->" in key
                     or "F->" in key
                     or "D->" in key
                 ):
-                    ufunc_db[op].pop(key)
+                    ufunc_db[dpnpop].pop(key)