Add examples that showcase the use of Hyperparameter search with Transformers #589
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This PR closes issue #37947 by expanding our hyperparameter‑search examples in the Trainer docs. In particular, it:
• Adds a SigOpt example (showing double, int, and categorical params)
• Includes a W&B example with random search configuration
• Ensures all four backends (Optuna, Ray Tune, SigOpt, W&B) follow the same structure
• Updates the setup instructions to list required dependencies
I’ve linked the original issue for context: huggingface/transformers#37947
Please let me know if anything needs tweaking—happy to adjust formatting, add more comments or improve the compute_objective logic! Thanks for taking a look. 🚀