Transformers v5: Simple model definitions powering the AI ecosystem

Transformers v5 has been released five years after its predecessor, marking significant growth with over 1.2 billion installs and 750,000 community model checkpoints. The new version focuses on simplicity through a modular design for model contributions, code reduction, and a consolidation to PyTorch as the primary backend. Training support is enhanced for both large-scale pre-training and fine-tuning, maintaining compatibility with ecosystem tools like Unsloth and Axolotl. V5 also brings a significant focus on improving inference performance and production readiness, collaborating with various libraries in the ecosystem.