No Immediate Fix Required: If you are generating text successfully and this warning is not causing any errors, you can ignore it. The warning is informational and does not affect the generation process for single-sequence tasks.

When to Fix:

Batch Generation: If you plan to generate multiple sequences with different lengths and need proper padding for batching, explicitly setting a pad_token_id is recommended.

Cleaner Logs: If you want to avoid the warning in your logs, you can explicitly set a pad_token_id.