Add new weights for efficientnet_b1 model (#5033)

* Add new weights for efficientnet_b1 model

* Update accuracies

* Updated the model url and metadata

* Updated default

torchvision/prototype/models/efficientnet.py

@@ -94,7 +94,19 @@ class EfficientNet_B1_Weights(WeightsEnum):
             "acc@5": 94.186,
         },
     )
-    default = ImageNet1K_V1
+    ImageNet1K_V2 = Weights(
+        url="https://download.pytorch.org/models/efficientnet_b1-c27df63c.pth",
+        transforms=partial(ImageNetEval, crop_size=240, resize_size=255, interpolation=InterpolationMode.BILINEAR),
+        meta={
+            **_COMMON_META,
+            "recipe": "https://github.com/pytorch/vision/issues/3995#new-recipe-with-lr-wd-crop-tuning",
+            "interpolation": InterpolationMode.BILINEAR,
+            "size": (240, 240),
+            "acc@1": 79.838,
+            "acc@5": 94.934,
+        },
+    )
+    default = ImageNet1K_V2
 
 
 class EfficientNet_B2_Weights(WeightsEnum):