Fix warning in fast_neural_style example (#2984)

* Update examples/fast_neural_style/vgg.py

* Update examples/fast_neural_style/vgg.py

* Update vgg.py

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Co-authored-by: sweep-ai[bot] <128439645+sweep-ai[bot]@users.noreply.github.com>
Co-authored-by: vfdev <vfdev.5@gmail.com>

examples/fast_neural_style/vgg.py

@@ -2,12 +2,13 @@
 
 import torch
 from torchvision import models
+from torchvision.models.vgg import VGG16_Weights
 
 
 class Vgg16(torch.nn.Module):
     def __init__(self, requires_grad=False):
         super(Vgg16, self).__init__()
-        vgg_pretrained_features = models.vgg16(pretrained=True).features
+        vgg_pretrained_features = models.vgg16(weights=VGG16_Weights.IMAGENET1K_V1).features
         self.slice1 = torch.nn.Sequential()
         self.slice2 = torch.nn.Sequential()
         self.slice3 = torch.nn.Sequential()