Based on transformers v4.26.1

Fixed

• Fix compacter init weights (@hSterz via #516)
• Restore compatibility of GPT-2 weight initialization with Transformers (@calpt via #525)
• Restore Python 3.7 compatibility (@lenglaender via #510)
• Fix LoRA & (IA)³ implementation for Bart & MBart (@calpt via #518)
• Fix resume_from_checkpoint in AdapterTrainer class (@hSterz via #514)