Remove Unused Libraries and Convert to f-strings (pytorch#1802)

Co-authored-by: Holly Sweeney <[email protected]>

Author: wesleyacheng

beginner_source/basics/quickstart_tutorial.py

@@ -26,8 +26,7 @@
 from torch import nn
 from torch.utils.data import DataLoader
 from torchvision import datasets
-from torchvision.transforms import ToTensor, Lambda, Compose
-import matplotlib.pyplot as plt
+from torchvision.transforms import ToTensor
 
 ######################################################################
 # PyTorch offers domain-specific libraries such as `TorchText <https://pytorch.org/text/stable/index.html>`_,
@@ -67,8 +66,8 @@
 test_dataloader = DataLoader(test_data, batch_size=batch_size)
 
 for X, y in test_dataloader:
-    print("Shape of X [N, C, H, W]: ", X.shape)
-    print("Shape of y: ", y.shape, y.dtype)
+    print(f"Shape of X [N, C, H, W]: {X.shape}")
+    print(f"Shape of y: {y.shape} {y.dtype}")
     break
 
 ######################################################################