[pre-commit.ci] auto fixes from pre-commit.com hooks

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Author: pre-commit-ci[bot]

doc/user-guide/training-a-neural-network-with-Pytorch-and-xbatcher.ipynb

@@ -234,7 +234,7 @@
     "epochs = 5\n",
     "\n",
     "for epoch in range(epochs):\n",
-    "    print(f'Epoch {epoch+1}/{epochs}')\n",
+    "    print(f'Epoch {epoch + 1}/{epochs}')\n",
     "    for batch, (X, y) in enumerate(train_dataloader):\n",
     "        # Forward pass\n",
     "        predictions = model(X)\n",