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Use for preference alignment when want simpler, faster training than DPO\u002FPPO.","henriquescastilho\u002Fmy-claude","henriquescastilho","https:\u002F\u002Favatars.githubusercontent.com\u002Fu\u002F153296945?v=4","01M6ESH7EXPXTH9CVQ4K16SRG8","Henrique Scheer","01M6ESH7JHEK2PTNNH4HEH787Z",0,"MIT","https:\u002F\u002Fgithub.com\u002Fhenriquescastilho\u002Fmy-claude\u002Fblob\u002Fmain\u002F.codex\u002Fvendor_imports\u002Fclaude\u002Fmarketplaces\u002Fclaude-code-templates\u002Fcli-tool\u002Fcomponents\u002Fskills\u002Fai-research\u002Fpost-training-simpo\u002FSKILL.md",[],[19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38],"training","simpo","simpo training","free","LLM Alignment","Reference-Free","DPO Alternative","Preference Optimization","performance","Efficient Training","TRL","Accelerate","DPO","Optimization","alignment","use","model","Transformers","PPO","Post-Training","2026-11-10 10:12:30",false,"---\nname: simpo-training\ndescription: Simple Preference Optimization for LLM alignment. Reference-free alternative to DPO with better performance (+6.4 points on AlpacaEval 2.0). No reference model needed, more efficient than DPO. Use for preference alignment when want simpler, faster training than DPO\u002FPPO.\nversion: 1.0.0\nauthor: Orchestra Research\nlicense: MIT\ntags: [Post-Training, SimPO, Preference Optimization, Alignment, DPO Alternative, Reference-Free, LLM Alignment, Efficient Training]\ndependencies: [torch, transformers, datasets, trl, accelerate]\n---\n\n# SimPO - Simple Preference Optimization\n\n## Quick start\n\nSimPO is a reference-free preference optimization method that outperforms DPO without needing a reference model.\n\n**Installation**:\n```bash\n# Create environment\nconda create -n simpo python=3.10 && conda activate simpo\n\n# Install PyTorch 2.2.2\n# Visit: https:\u002F\u002Fpytorch.org\u002Fget-started\u002Flocally\u002F\n\n# Install alignment-handbook\ngit clone https:\u002F\u002Fgithub.com\u002Fhuggingface\u002Falignment-handbook.git\ncd alignment-handbook\npython -m pip install .\n\n# Install Flash Attention 2\npython -m pip install flash-attn --no-build-isolation\n```\n\n**Training** (Mistral 7B):\n```bash\nACCELERATE_LOG_LEVEL=info accelerate launch \\\n  --config_file accelerate_configs\u002Fdeepspeed_zero3.yaml \\\n  scripts\u002Frun_simpo.py \\\n  training_configs\u002Fmistral-7b-base-simpo.yaml\n```\n\n## Common workflows\n\n### Workflow 1: Train from base model (Mistral 7B)\n\n**Config** (`mistral-7b-base-simpo.yaml`):\n```yaml\n# Model\nmodel_name_or_path: mistralai\u002FMistral-7B-v0.1\ntorch_dtype: bfloat16\n\n# Dataset\ndataset_mixer:\n  HuggingFaceH4\u002Fultrafeedback_binarized: 1.0\ndataset_splits:\n  - train_prefs\n  - test_prefs\n\n# SimPO hyperparameters\nbeta: 2.0                  # Reward scaling (2.0-10.0)\ngamma_beta_ratio: 0.5       # Target margin (0-1)\nloss_type: sigmoid          # sigmoid or hinge\nsft_weight: 0.0             # Optional SFT regularization\n\n# Training\nlearning_rate: 5e-7         # Critical: 3e-7 to 1e-6\nnum_train_epochs: 1\nper_device_train_batch_size: 1\ngradient_accumulation_steps: 8\n\n# Output\noutput_dir: .\u002Foutputs\u002Fmistral-7b-simpo\n```\n\n**Launch training**:\n```bash\naccelerate launch --config_file accelerate_configs\u002Fdeepspeed_zero3.yaml \\\n  scripts\u002Frun_simpo.py training_configs\u002Fmistral-7b-base-simpo.yaml\n```\n\n### Workflow 2: Fine-tune instruct model (Llama 3 8B)\n\n**Config** (`llama3-8b-instruct-simpo.yaml`):\n```yaml\nmodel_name_or_path: meta-llama\u002FMeta-Llama-3-8B-Instruct\n\ndataset_mixer:\n  argilla\u002Fultrafeedback-binarized-preferences-cleaned: 1.0\n\nbeta: 2.5\ngamma_beta_ratio: 0.5\nlearning_rate: 5e-7\nsft_weight: 0.1             # Add SFT loss to preserve capabilities\n\nnum_train_epochs: 1\nper_device_train_batch_size: 2\ngradient_accumulation_steps: 4\noutput_dir: .\u002Foutputs\u002Fllama3-8b-simpo\n```\n\n**Launch**:\n```bash\naccelerate launch --config_file accelerate_configs\u002Fdeepspeed_zero3.yaml \\\n  scripts\u002Frun_simpo.py training_configs\u002Fllama3-8b-instruct-simpo.yaml\n```\n\n### Workflow 3: Reasoning-intensive tasks (lower LR)\n\n**For math\u002Fcode tasks**:\n```yaml\nmodel_name_or_path: deepseek-ai\u002Fdeepseek-math-7b-base\n\ndataset_mixer:\n  argilla\u002Fdistilabel-math-preference-dpo: 1.0\n\nbeta: 5.0                   # Higher for stronger signal\ngamma_beta_ratio: 0.7       # Larger margin\nlearning_rate: 3e-7         # Lower LR for reasoning\nsft_weight: 0.0\n\nnum_train_epochs: 1\nper_device_train_batch_size: 1\ngradient_accumulation_steps: 16\n```\n\n## When to use vs alternatives\n\n**Use SimPO when**:\n- Want simpler training than DPO (no reference model)\n- Have preference data (chosen\u002Frejected pairs)\n- Need better performance than DPO\n- Limited compute resources\n- Single-node training sufficient\n\n**Algorithm selection**:\n- **SimPO**: Simplest, best performance, no reference model\n- **DPO**: Need reference model baseline, more conservative\n- **PPO**: Maximum control, need reward model, complex setup\n- **GRPO**: Memory-efficient RL, no critic\n\n**Use alternatives instead**:\n- **OpenRLHF**: Multi-node distributed training, PPO\u002FGRPO\n- **TRL**: Need multiple methods in one framework\n- **DPO**: Established baseline comparison\n\n## Common issues\n\n**Issue: Loss divergence**\n\nReduce learning rate:\n```yaml\nlearning_rate: 3e-7  # Reduce from 5e-7\n```\n\nReduce beta:\n```yaml\nbeta: 1.0  # Reduce from 2.0\n```\n\n**Issue: Model forgets capabilities**\n\nAdd SFT regularization:\n```yaml\nsft_weight: 0.1  # Add SFT loss component\n```\n\n**Issue: Poor preference separation**\n\nIncrease beta and margin:\n```yaml\nbeta: 5.0            # Increase from 2.0\ngamma_beta_ratio: 0.8  # Increase from 0.5\n```\n\n**Issue: OOM during training**\n\nReduce batch size:\n```yaml\nper_device_train_batch_size: 1\ngradient_accumulation_steps: 16  # Maintain effective batch\n```\n\nEnable gradient checkpointing:\n```yaml\ngradient_checkpointing: true\n```\n\n## Advanced topics\n\n**Loss functions**: See [references\u002Floss-functions.md](references\u002Floss-functions.md) for sigmoid vs hinge loss, mathematical formulations, and when to use each.\n\n**Hyperparameter tuning**: See [references\u002Fhyperparameters.md](references\u002Fhyperparameters.md) for beta, gamma, learning rate selection guide, and model-size-specific recommendations.\n\n**Dataset preparation**: See [references\u002Fdatasets.md](references\u002Fdatasets.md) for preference data formats, quality filtering, and custom dataset creation.\n\n## Hardware requirements\n\n- **GPU**: NVIDIA A100\u002FH100 recommended\n- **VRAM**:\n  - 7B model: 1× A100 40GB (DeepSpeed ZeRO-3)\n  - 8B model: 2× A100 40GB\n  - 70B model: 8× A100 80GB\n- **Single-node**: DeepSpeed ZeRO-3 sufficient\n- **Mixed precision**: BF16 recommended\n\n**Memory optimization**:\n- DeepSpeed ZeRO-3 (default config)\n- Gradient checkpointing\n- Flash Attention 2\n\n## Resources\n\n- Paper: https:\u002F\u002Farxiv.org\u002Fabs\u002F2405.14734 (NeurIPS 2024)\n- GitHub: https:\u002F\u002Fgithub.com\u002Fprinceton-nlp\u002FSimPO\n- Models: https:\u002F\u002Fhuggingface.co\u002Fprinceton-nlp\n- Alignment Handbook: https:\u002F\u002Fgithub.com\u002Fhuggingface\u002Falignment-handbook\n\n\n\n","# SimPO - Simple Preference Optimization\n\n## Quick start\n\nSimPO is a reference-free preference optimization method that outperforms DPO without needing a reference model.\n\n**Installation**:\n```bash\n# Create environment\nconda create -n simpo python=3.10 && conda activate simpo\n\n# Install PyTorch 2.2.2\n# Visit: https:\u002F\u002Fpytorch.org\u002Fget-started\u002Flocally\u002F\n\n# Install alignment-handbook\ngit clone https:\u002F\u002Fgithub.com\u002Fhuggingface\u002Falignment-handbook.git\ncd alignment-handbook\npython -m pip install .\n\n# Install Flash Attention 2\npython -m pip install flash-attn --no-build-isolation\n```\n\n**Training** (Mistral 7B):\n```bash\nACCELERATE_LOG_LEVEL=info accelerate launch \\\n  --config_file accelerate_configs\u002Fdeepspeed_zero3.yaml \\\n  scripts\u002Frun_simpo.py \\\n  training_configs\u002Fmistral-7b-base-simpo.yaml\n```\n\n## Common workflows\n\n### Workflow 1: Train from base model (Mistral 7B)\n\n**Config** (`mistral-7b-base-simpo.yaml`):\n```yaml\n# Model\nmodel_name_or_path: mistralai\u002FMistral-7B-v0.1\ntorch_dtype: bfloat16\n\n# Dataset\ndataset_mixer:\n  HuggingFaceH4\u002Fultrafeedback_binarized: 1.0\ndataset_splits:\n  - train_prefs\n  - test_prefs\n\n# SimPO hyperparameters\nbeta: 2.0                  # Reward scaling (2.0-10.0)\ngamma_beta_ratio: 0.5       # Target margin (0-1)\nloss_type: sigmoid          # sigmoid or hinge\nsft_weight: 0.0             # Optional SFT regularization\n\n# Training\nlearning_rate: 5e-7         # Critical: 3e-7 to 1e-6\nnum_train_epochs: 1\nper_device_train_batch_size: 1\ngradient_accumulation_steps: 8\n\n# Output\noutput_dir: .\u002Foutputs\u002Fmistral-7b-simpo\n```\n\n**Launch training**:\n```bash\naccelerate launch --config_file accelerate_configs\u002Fdeepspeed_zero3.yaml \\\n  scripts\u002Frun_simpo.py training_configs\u002Fmistral-7b-base-simpo.yaml\n```\n\n### Workflow 2: Fine-tune instruct model (Llama 3 8B)\n\n**Config** (`llama3-8b-instruct-simpo.yaml`):\n```yaml\nmodel_name_or_path: meta-llama\u002FMeta-Llama-3-8B-Instruct\n\ndataset_mixer:\n  argilla\u002Fultrafeedback-binarized-preferences-cleaned: 1.0\n\nbeta: 2.5\ngamma_beta_ratio: 0.5\nlearning_rate: 5e-7\nsft_weight: 0.1             # Add SFT loss to preserve capabilities\n\nnum_train_epochs: 1\nper_device_train_batch_size: 2\ngradient_accumulation_steps: 4\noutput_dir: .\u002Foutputs\u002Fllama3-8b-simpo\n```\n\n**Launch**:\n```bash\naccelerate launch --config_file accelerate_configs\u002Fdeepspeed_zero3.yaml \\\n  scripts\u002Frun_simpo.py training_configs\u002Fllama3-8b-instruct-simpo.yaml\n```\n\n### Workflow 3: Reasoning-intensive tasks (lower LR)\n\n**For math\u002Fcode tasks**:\n```yaml\nmodel_name_or_path: deepseek-ai\u002Fdeepseek-math-7b-base\n\ndataset_mixer:\n  argilla\u002Fdistilabel-math-preference-dpo: 1.0\n\nbeta: 5.0                   # Higher for stronger signal\ngamma_beta_ratio: 0.7       # Larger margin\nlearning_rate: 3e-7         # Lower LR for reasoning\nsft_weight: 0.0\n\nnum_train_epochs: 1\nper_device_train_batch_size: 1\ngradient_accumulation_steps: 16\n```\n\n## When to use vs alternatives\n\n**Use SimPO when**:\n- Want simpler training than DPO (no reference model)\n- Have preference data (chosen\u002Frejected pairs)\n- Need better performance than DPO\n- Limited compute resources\n- Single-node training sufficient\n\n**Algorithm selection**:\n- **SimPO**: Simplest, best performance, no reference model\n- **DPO**: Need reference model baseline, more conservative\n- **PPO**: Maximum control, need reward model, complex setup\n- **GRPO**: Memory-efficient RL, no critic\n\n**Use alternatives instead**:\n- **OpenRLHF**: Multi-node distributed training, PPO\u002FGRPO\n- **TRL**: Need multiple methods in one framework\n- **DPO**: Established baseline comparison\n\n## Common issues\n\n**Issue: Loss divergence**\n\nReduce learning rate:\n```yaml\nlearning_rate: 3e-7  # Reduce from 5e-7\n```\n\nReduce beta:\n```yaml\nbeta: 1.0  # Reduce from 2.0\n```\n\n**Issue: Model forgets capabilities**\n\nAdd SFT regularization:\n```yaml\nsft_weight: 0.1  # Add SFT loss component\n```\n\n**Issue: Poor preference separation**\n\nIncrease beta and margin:\n```yaml\nbeta: 5.0            # Increase from 2.0\ngamma_beta_ratio: 0.8  # Increase from 0.5\n```\n\n**Issue: OOM during training**\n\nReduce batch size:\n```yaml\nper_device_train_batch_size: 1\ngradient_accumulation_steps: 16  # Maintain effective batch\n```\n\nEnable gradient checkpointing:\n```yaml\ngradient_checkpointing: true\n```\n\n## Advanced topics\n\n**Loss functions**: See [references\u002Floss-functions.md](references\u002Floss-functions.md) for sigmoid vs hinge loss, mathematical formulations, and when to use each.\n\n**Hyperparameter tuning**: See [references\u002Fhyperparameters.md](references\u002Fhyperparameters.md) for beta, gamma, learning rate selection guide, and model-size-specific recommendations.\n\n**Dataset preparation**: See [references\u002Fdatasets.md](references\u002Fdatasets.md) for preference data formats, quality filtering, and custom dataset creation.\n\n## Hardware requirements\n\n- **GPU**: NVIDIA A100\u002FH100 recommended\n- **VRAM**:\n  - 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Also trigger when the user faces a fork-in-the-road decision, wants to stress-test an idea, or needs to think through consequences before committing.","https:\u002F\u002Fgithub.com\u002Fhenriquescastilho\u002Fmy-claude\u002Fblob\u002Fmain\u002F.codex\u002Fvendor_imports\u002Fclaude\u002Fmarketplaces\u002Fclaude-scientific-skills\u002Fscientific-skills\u002Fwhat-if-oracle\u002FSKILL.md",[180],{"categoryNo":181,"categoryName":182,"taxonomyType":101,"taxonomyTypeDesc":102},"01JBSEEDCAT000000000000023","Skill与智能体开发",[184,185,186,187,188,189,190,191,192,193,194,126,127,195,196,197,198,199,200,201],"oracle","what if oracle","go","run","ux","futures","analysis","explore","decision","branch","question","idea","exploration","options","stress-test","strategies","scenario","stress",{"skillNo":203,"name":204,"nameZh":6,"description":205,"descriptionZh":6,"repositoryFullName":8,"ownerLogin":9,"ownerAvatarUrl":10,"ownerAccountNo":11,"ownerDisplayName":12,"repositoryNo":13,"starsCount":14,"licenseSpdxId":15,"licenseFileUrl":6,"sourceHtmlUrl":206,"categories":207,"keywords":218,"publishedAt":39},"01M6EZZCXAEB49RXGQCJX5E8GB","venue-templates","Access comprehensive LaTeX templates, formatting requirements, and submission guidelines for major scientific publication venues (Nature, Science, PLOS, IEEE, ACM), academic conferences (NeurIPS, ICML, CVPR, CHI), research posters, and grant proposals (NSF, NIH, DOE, DARPA). This skill should be used when preparing manuscripts for journal submission, conference papers, research posters, or grant proposals and need venue-specific formatting requirements and templates.","https:\u002F\u002Fgithub.com\u002Fhenriquescastilho\u002Fmy-claude\u002Fblob\u002Fmain\u002F.codex\u002Fvendor_imports\u002Fclaude\u002Fmarketplaces\u002Fclaude-scientific-skills\u002Fscientific-skills\u002Fvenue-templates\u002FSKILL.md",[208,211,214,215],{"categoryNo":209,"categoryName":210,"taxonomyType":101,"taxonomyTypeDesc":102},"01JBSEEDCAT000000000000018","写作与文案",{"categoryNo":212,"categoryName":213,"taxonomyType":101,"taxonomyTypeDesc":102},"01JBSEEDCAT000000000000021","资料检索与研究",{"categoryNo":181,"categoryName":182,"taxonomyType":101,"taxonomyTypeDesc":102},{"categoryNo":216,"categoryName":217,"taxonomyType":112,"taxonomyTypeDesc":113},"01JBSEEDCAT000000000000036","内容创作者",[219,220,221,222,223,224,225,226,123,227,126,127,128,228,229,230,231,232,173,233],"templates","venue templates","research","guidelines","NeurIPS","ICML","LaTeX","science","access","proposals","Academic","requirements","formatting","journal","chi"]