Avoid casting to fileview-able BQM on upload, if possible

dwavesystems · Jul 6, 2020 · a55d58a · a55d58a
1 parent 7057ea5
commit a55d58a
Showing 1 changed file with 7 additions and 5 deletions.
diff --git a/dwave/cloud/solver.py b/dwave/cloud/solver.py
@@ -360,19 +360,21 @@ def _bqm_as_fileview(bqm):
         # XXX: temporary until something like dwavesystems/dimod#599 is implemented.
 
         try:
+            import dimod
             from dimod.serialization.fileview import FileView as BQMFileView
-            from dimod import AdjVectorBQM
         except ImportError: # pragma: no cover
             return
 
         if isinstance(bqm, BQMFileView):
             return bqm
 
-        try:
-            if not isinstance(bqm, AdjVectorBQM):
+        # test explicitly to avoid copy on cast if possible
+        fileviewable = (dimod.AdjArrayBQM, dimod.AdjVectorBQM, dimod.AdjMapBQM)
+        if not isinstance(bqm, fileviewable):
+            try:
                 bqm = AdjVectorBQM(bqm)
-        except:
-            return
+            except:
+                return
 
         try:
             return BQMFileView(bqm)