Patch release: SFTTrainer and PPOTrainer bug fixes

What's Changed

• Make shuffle optional by @lopez-hector in https://github.com/lvwerra/trl/pull/457
• Pre-commit by @vwxyzjn in https://github.com/lvwerra/trl/pull/448
• Debug the tortuous logic in _prepare_dataset function by @BeibinLi in https://github.com/lvwerra/trl/pull/464
• [CI] Fix CI RM by @younesbelkada in https://github.com/lvwerra/trl/pull/468
• Update sft_trainer.py by @JulesGM in https://github.com/lvwerra/trl/pull/474
• Refactor README by @younesbelkada in https://github.com/lvwerra/trl/pull/460
• add ratio threshold to avoid spikes by @lvwerra in https://github.com/lvwerra/trl/pull/488
• fix typo in reward_modeling.py by @csyourui in https://github.com/lvwerra/trl/pull/494
• FIX: contributing guidelines command by @BramVanroy in https://github.com/lvwerra/trl/pull/493
• Remove padding in batched generation. by @lvwerra in https://github.com/lvwerra/trl/pull/487
• Adds some options to stabilize the KL penalty by @edbeeching in https://github.com/lvwerra/trl/pull/486
• correctly implement gradient checkpointing to multi-adapter example by @mnoukhov in https://github.com/lvwerra/trl/pull/479
• Disable mlm by default in DataCollatorForCompletionOnlyLM, add ignore_index and docstring by @BramVanroy in https://github.com/lvwerra/trl/pull/476
• Use float instead of double to avoid issues with MPS device by @younesbelkada in https://github.com/lvwerra/trl/pull/499
• [PPOTrainer] Add prefix tuning support by @younesbelkada in https://github.com/lvwerra/trl/pull/501
• [PPOTrainer] Add prompt tuning support on TRL by @younesbelkada in https://github.com/lvwerra/trl/pull/500
• [SFTTrainer] Fix the sequence length check of SFTTrainer by @younesbelkada in https://github.com/lvwerra/trl/pull/512

New Contributors

• @lopez-hector made their first contribution in https://github.com/lvwerra/trl/pull/457
• @BeibinLi made their first contribution in https://github.com/lvwerra/trl/pull/464
• @csyourui made their first contribution in https://github.com/lvwerra/trl/pull/494
• @BramVanroy made their first contribution in https://github.com/lvwerra/trl/pull/493

Full Changelog: https://github.com/lvwerra/trl/compare/v0.4.6...v0.4.7