v1.0.3

This is a patch release with two notable fixes and a feature:

• Training logs now correctly list the number of training examples (now called "unique pairs")
• The warmup steps is now based on the number of steps rather than args.max_steps if args.max_steps > the number of steps. This prevents accidentally being in warm-up for longer than the desired warmup proportion.
• When training with string labels, the model now tries to automatically set the string labels to SetFitModel.labels if this variable hasn't been defined yet.

The PRs:

• Set labels based on head classes, if possible by @tomaarsen in #476
• Refactor training logs & fix warmup_proportion by @tomaarsen in #475

Full Changelog: v1.0.2...v1.0.3