TorchScript single-output fix

[glenn-jocher]

🛠️ PR Summary

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🌟 Summary

Refined export options and inference flow.

📊 Key Changes

• Improved readability of the export formats list in export.py.
• Distinguished between PyTorch (pt) and TorchScript (jit) model inference flows in common.py.

🎯 Purpose & Impact

• Enhanced code clarity in export options supports easier maintenance and updates. 🛠️
• Separating inference handling provides cleaner code structure and allows for potential individual optimizations for PyTorch and TorchScript backends. 🚀
• These updates should not affect end users directly, but improved codebase health can lead to fewer bugs and better future features. 🌱