fix: prevent in-place operations in TimesNet model to avoid potential side effects

[Karesis]

Changes

This PR addresses potential side effects caused by in-place operations in the TimesNet model.

Modifications

• Replaced in-place operators (e.g., /=, +=) with their non-in-place counterparts (e.g., = x / y, = x + y)
• Ensured all tensor operations create new objects instead of modifying existing ones
• Maintained the original mathematical operations while improving code safety

Rationale

1. In-place operators (/=, +=, etc.) modify tensors directly, which can lead to unexpected side effects
2. Using non-in-place operations creates new objects, making the code behavior more predictable
3. This change prevents potential issues in model training and inference

Files Changed

• models/TimesNet.py

Additional Notes

These modifications follow defensive programming practices by avoiding in-place operations, making the code more robust and easier to debug.