removed duplicate as (pytorch#3591)

Co-authored-by: urmi22 <debjanimazumder22@example.com>
Co-authored-by: Vasilis Vryniotis <datumbox@users.noreply.github.com>

torchvision/models/detection/transform.py

@@ -84,7 +84,7 @@ def forward(self,
         if targets is not None:
             # make a copy of targets to avoid modifying it in-place
             # once torchscript supports dict comprehension
-            # this can be simplified as as follows
+            # this can be simplified as follows
             # targets = [{k: v for k,v in t.items()} for t in targets]
             targets_copy: List[Dict[str, Tensor]] = []
             for t in targets: