feat: implement rae autoencoder.

docs/source/en/_toctree.yml

@@ -456,6 +456,8 @@
         title: AutoencoderKLQwenImage
       - local: api/models/autoencoder_kl_wan
         title: AutoencoderKLWan
+      - local: api/models/autoencoder_rae
+        title: AutoencoderRAE
       - local: api/models/consistency_decoder_vae
         title: ConsistencyDecoderVAE
       - local: api/models/autoencoder_oobleck

docs/source/en/api/models/autoencoder_rae.md

@@ -0,0 +1,88 @@
+<!-- Copyright 2026 The NYU Vision-X and HuggingFace Teams. All rights reserved.
+
+Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with
+the License. You may obtain a copy of the License at
+
+http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on
+an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the
+specific language governing permissions and limitations under the License.
+-->
+
+# AutoencoderRAE
+
+The Representation Autoencoder (RAE) model introduced in [Diffusion Transformers with Representation Autoencoders](https://huggingface.co/papers/2510.11690) by Boyang Zheng, Nanye Ma, Shengbang Tong, Saining Xie from NYU VISIONx.
+
+RAE combines a frozen pretrained vision encoder (DINOv2, SigLIP2, or MAE) with a trainable ViT-MAE-style decoder. In the two-stage RAE training recipe, the autoencoder is trained in stage 1 (reconstruction), and then a diffusion model is trained on the resulting latent space in stage 2 (generation).
+
+The following RAE models are released and supported in Diffusers:
+
+| Model | Encoder | Latent shape (224px input) |
+|:------|:--------|:---------------------------|
+| [`nyu-visionx/RAE-dinov2-wReg-base-ViTXL-n08`](https://huggingface.co/nyu-visionx/RAE-dinov2-wReg-base-ViTXL-n08) | DINOv2-base | 768 x 16 x 16 |
+| [`nyu-visionx/RAE-dinov2-wReg-base-ViTXL-n08-i512`](https://huggingface.co/nyu-visionx/RAE-dinov2-wReg-base-ViTXL-n08-i512) | DINOv2-base (512px) | 768 x 32 x 32 |
+| [`nyu-visionx/RAE-dinov2-wReg-small-ViTXL-n08`](https://huggingface.co/nyu-visionx/RAE-dinov2-wReg-small-ViTXL-n08) | DINOv2-small | 384 x 16 x 16 |
+| [`nyu-visionx/RAE-dinov2-wReg-large-ViTXL-n08`](https://huggingface.co/nyu-visionx/RAE-dinov2-wReg-large-ViTXL-n08) | DINOv2-large | 1024 x 16 x 16 |
+| [`nyu-visionx/RAE-siglip2-base-p16-i256-ViTXL-n08`](https://huggingface.co/nyu-visionx/RAE-siglip2-base-p16-i256-ViTXL-n08) | SigLIP2-base | 768 x 16 x 16 |
+| [`nyu-visionx/RAE-mae-base-p16-ViTXL-n08`](https://huggingface.co/nyu-visionx/RAE-mae-base-p16-ViTXL-n08) | MAE-base | 768 x 16 x 16 |
+
+## Loading a pretrained model
+
+```python
+from diffusers import AutoencoderRAE
+
+model = AutoencoderRAE.from_pretrained(
+    "nyu-visionx/RAE-dinov2-wReg-base-ViTXL-n08"
+).to("cuda").eval()
+```
+
+## Encoding and decoding a real image
+
+```python
+import torch
+from diffusers import AutoencoderRAE
+from PIL import Image
+from torchvision.transforms.functional import to_tensor, to_pil_image
+
+model = AutoencoderRAE.from_pretrained(
+    "nyu-visionx/RAE-dinov2-wReg-base-ViTXL-n08"
+).to("cuda").eval()
+
+image = Image.open("cat.png").convert("RGB").resize((224, 224))
+x = to_tensor(image).unsqueeze(0).to("cuda")  # (1, 3, 224, 224), values in [0, 1]
+
+with torch.no_grad():
+    latents = model.encode(x).latent        # (1, 768, 16, 16)
+    recon = model.decode(latents).sample     # (1, 3, 256, 256)
+
+recon_image = to_pil_image(recon[0].clamp(0, 1).cpu())
+recon_image.save("recon.png")
+```
+
+## Latent normalization
+
+Some pretrained checkpoints include per-channel `latents_mean` and `latents_std` statistics for normalizing the latent space. When present, `encode` and `decode` automatically apply the normalization and denormalization, respectively.
+
+```python
+model = AutoencoderRAE.from_pretrained(
+    "nyu-visionx/RAE-dinov2-wReg-base-ViTXL-n08"
+).to("cuda").eval()
+
+# Latent normalization is handled automatically inside encode/decode
+# when the checkpoint config includes latents_mean/latents_std.
+with torch.no_grad():
+    latents = model.encode(x).latent   # normalized latents
+    recon = model.decode(latents).sample
+```
+
+## AutoencoderRAE
+
+[[autodoc]] AutoencoderRAE
+  - encode
+  - decode
+  - all
+
+## DecoderOutput
+
+[[autodoc]] models.autoencoders.vae.DecoderOutput

examples/research_projects/autoencoder_rae/README.md

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+# Training AutoencoderRAE
+
+This example trains the decoder of `AutoencoderRAE` (stage-1 style), while keeping the representation encoder frozen.
+
+It follows the same high-level training recipe as the official RAE stage-1 setup:
+- frozen encoder
+- train decoder
+- pixel reconstruction loss
+- optional encoder feature consistency loss
+
+## Quickstart
+
+### Resume or finetune from pretrained weights
+
+```bash
+accelerate launch examples/research_projects/autoencoder_rae/train_autoencoder_rae.py \
+  --pretrained_model_name_or_path nyu-visionx/RAE-dinov2-wReg-base-ViTXL-n08 \
+  --train_data_dir /path/to/imagenet_like_folder \
+  --output_dir /tmp/autoencoder-rae \
+  --resolution 256 \
+  --train_batch_size 8 \
+  --learning_rate 1e-4 \
+  --num_train_epochs 10 \
+  --report_to wandb \
+  --reconstruction_loss_type l1 \
+  --use_encoder_loss \
+  --encoder_loss_weight 0.1
+```
+
+### Train from scratch with a pretrained encoder
+
+```bash
+accelerate launch examples/research_projects/autoencoder_rae/train_autoencoder_rae.py \
+  --train_data_dir /path/to/imagenet_like_folder \
+  --output_dir /tmp/autoencoder-rae \
+  --resolution 256 \
+  --encoder_type dinov2 \
+  --encoder_name_or_path facebook/dinov2-with-registers-base \
+  --encoder_input_size 224 \
+  --patch_size 16 \
+  --image_size 256 \
+  --decoder_hidden_size 1152 \
+  --decoder_num_hidden_layers 28 \
+  --decoder_num_attention_heads 16 \
+  --decoder_intermediate_size 4096 \
+  --train_batch_size 8 \
+  --learning_rate 1e-4 \
+  --num_train_epochs 10 \
+  --report_to wandb \
+  --reconstruction_loss_type l1 \
+  --use_encoder_loss \
+  --encoder_loss_weight 0.1
+```
+
+Note: stage-1 reconstruction loss assumes matching target/output spatial size, so `--resolution` must equal `--image_size`.
+
+Dataset format is expected to be `ImageFolder`-compatible:
+
+```text
+train_data_dir/
+  class_a/
+    img_0001.jpg
+  class_b/
+    img_0002.jpg
+```