Long dataset names break w&b tagging

[genemerewether]

System Info

Any

Information

• One of the scripts in the examples/ folder of LeRobot
• My own task or dataset (give details below)

Reproduction

1. Create a dataset with > 56 characters (56 = 64 - len("dataset:")
2. Try to train with w&b logging (wandb.enable=true)

wandb.init will fail, crashing training.

invalid tag 'dataset:aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa'. must be between 1 and 64 characters

Expected behavior

Either trim the beginning or end of the dataset name to fit, or skip creating the tag.