Fix typo and replace torch.accelerator with standard CUDA detection

[Copilot]

Changes

• Fixed typo: pre-defijned → pre-defined in markdown cell
• Replaced torch.accelerator API: Removed PyTorch 2.5+ specific torch.accelerator in favor of standard CUDA detection

Device Selection

Before:

import torch.accelerator

if torch.accelerator.is_available():
    device = torch.accelerator.current_accelerator()
else:
    device = torch.device("cpu")

After:

device = torch.device("cuda" if torch.cuda.is_available() else "cpu")

The accelerator API is recent (2.5+), sparsely documented, and less commonly used. Standard CUDA detection works across all modern PyTorch versions and follows official tutorial patterns.

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• pytorch.org
  • Triggering command: /home/REDACTED/work/_temp/ghcca-node/node/bin/node /home/REDACTED/work/_temp/ghcca-node/node/bin/node --enable-source-maps /home/REDACTED/work/_temp/copilot-developer-action-main/dist/index.js (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

Original prompt

Check for potential issues in the notebook in source-code/pytorch.

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