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+
+# Differentially Private Fine-Tuning
+
+Differential privacy (DP) is a training technique that limits the influence of individual training examples on a model's learned parameters. This can help reduce memorization of sensitive information while still allowing a model to learn useful patterns from data.
+
+PEFT methods are a natural fit for differentially private training because only a small subset of model parameters are updated during fine-tuning. This reduces memory requirements and can make privacy-preserving training significantly more practical for large language models.
+
+This tutorial demonstrates how to combine PEFT with [FastDP](https://github.com/awslabs/fast-differential-privacy) to perform differentially private fine-tuning of Transformer models. The same workflow can be applied to many PEFT methods, including LoRA, Prompt Tuning, Prefix Tuning, IA3, Vera, LoHa, LoKr, OFT, and BOFT.
+
+## Setup
+
+Install PEFT, Transformers, and FastDP.
+
+```py
+pip install peft transformers fastDP
+```
+
+Next, load a pretrained model and tokenizer.
+
+```py
+from transformers import AutoModelForCausalLM, AutoTokenizer
+
+model_name = "facebook/opt-350m"
+
+tokenizer = AutoTokenizer.from_pretrained(model_name)
+model = AutoModelForCausalLM.from_pretrained(model_name)
+```
+
+## Create a PEFT model
+
+Configure a PEFT method and attach it to the base model. This example uses LoRA.
+
+```py
+from peft import LoraConfig, TaskType, get_peft_model
+
+peft_config = LoraConfig(
+    task_type=TaskType.CAUSAL_LM,
+    r=8,
+    lora_alpha=32,
+    lora_dropout=0.1,
+)
+
+model = get_peft_model(model, peft_config)
+```
+
+You can verify that only adapter parameters will be updated during training.
+
+```py
+model.print_trainable_parameters()
+```
+
+## Configure differential privacy
+
+Create an optimizer as usual.
+
+```py
+import torch
+
+optimizer = torch.optim.AdamW(
+    model.parameters(),
+    lr=1e-4,
+)
+```
+
+Then initialize a FastDP privacy engine and attach it to the optimizer.
+
+```py
+import fastDP
+
+privacy_engine = fastDP.PrivacyEngine(
+    model,
+    batch_size=batch_size,
+    sample_size=len(train_dataset),
+    epochs=num_epochs,
+    target_epsilon=8.0,
+)
+
+privacy_engine.attach(optimizer)
+```
+
+After attaching the privacy engine, FastDP automatically performs gradient clipping and noise injection during optimization.
+
+## Training
+
+Training proceeds normally after the privacy engine is attached.
+
+```py
+model.train()
+
+for batch in train_dataloader:
+    outputs = model(**batch)
+    loss = outputs.loss
+
+    loss.backward()
+
+    optimizer.step()
+    optimizer.zero_grad()
+```
+
+FastDP manages the privacy-preserving modifications internally, allowing the PEFT model to be trained with a standard PyTorch training loop.
+
+## Using other PEFT methods
+
+The same procedure can be applied to other PEFT configurations. Replace the LoRA configuration with any supported PEFT method before calling [`get_peft_model`](https://github.com/huggingface/peft/blob/main/src/peft/mapping_func.py).
+
+For example:
+
+```py
+from peft import PromptTuningConfig
+
+peft_config = PromptTuningConfig(
+    task_type=TaskType.CAUSAL_LM,
+    num_virtual_tokens=64,
+)
+
+model = get_peft_model(model, peft_config)
+```
+
+or:
+
+```py
+from peft import PrefixTuningConfig
+
+peft_config = PrefixTuningConfig(
+    task_type=TaskType.CAUSAL_LM,
+    num_virtual_tokens=30,
+)
+
+model = get_peft_model(model, peft_config)
+```
+
+Since FastDP is attached to the final PEFT model and optimizer, no additional changes are required when switching between supported PEFT methods.
+
+## Saving the adapter
+
+After training, save the adapter weights as you would for any other PEFT workflow.
+
+```py
+model.save_pretrained("dp-lora-adapter")
+```
+
+The adapter can later be loaded into a compatible base model using the standard PEFT loading APIs.
+
+## Next steps
+
+This tutorial demonstrated how to combine PEFT with FastDP to perform differentially private fine-tuning. For more information about available PEFT methods, see the PEFT method guides. For details about privacy accounting, clipping strategies, and privacy budgets, refer to the FastDP documentation.