First add PixArt-LCM model card.

README.md

@@ -1,3 +1,129 @@
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 license: openrail++
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+tags:
+- text-to-image
+- Pixart-α
+- LCM
+---
+
+<p align="center">
+  <img src="asset/pixart-lcm2.png"  height=120>
+</p>
+
+<div style="display:flex;justify-content: center">
+  <a href="https://pixart-alpha.github.io/"><img src="https://img.shields.io/static/v1?label=Project%20Page&message=Github&color=blue&logo=github-pages"></a> &ensp;
+  <a href="https://huggingface.co/spaces/PixArt-alpha/PixArt-alpha"><img src="https://img.shields.io/static/v1?label=Demo PixArt&message=HuggingFace&color=yellow"></a> &ensp;
+  <a href="https://huggingface.co/spaces/PixArt-alpha/PixArt-LCM"><img src="https://img.shields.io/static/v1?label=Demo PixArt-LCM&message=HuggingFace&color=yellow"></a> &ensp;
+  <a href="https://arxiv.org/abs/2310.00426"><img src="https://img.shields.io/static/v1?label=PixArt&message=Arxiv&color=red&logo=arxiv"></a> &ensp;
+  <a href="https://arxiv.org/abs/2310.04378"><img src="https://img.shields.io/static/v1?label=LCM&message=Arxiv&color=red&logo=arxiv"></a> &ensp;
+  <a href="https://github.com/orgs/PixArt-alpha/discussions"><img src="https://img.shields.io/static/v1?label=Discussion&message=Github&color=green&logo=github"></a> &ensp;
+</div>
+
+# 🐱 Pixart-LCM Model Card
+## Model
+![pipeline](asset/model.png)
+
+[Pixart-α](https://arxiv.org/abs/2310.00426) consists of pure transformer blocks for latent diffusion: 
+It can directly generate 1024px images from text prompts within a single sampling process.
+
+[LCMs](https://arxiv.org/abs/2310.04378) is a diffusion distillation method which predict PF-ODE's solution directly in latent space, achieving super fast inference with few steps.
+
+Source code of PixArt-LCM is available at https://github.com/PixArt-alpha/PixArt-alpha.
+
+### Model Description
+
+- **Developed by:** Pixart & LCM teams
+- **Model type:** Diffusion-Transformer-based text-to-image generative model
+- **License:** [CreativeML Open RAIL++-M License](https://huggingface.co/stabilityai/stable-diffusion-xl-base-1.0/blob/main/LICENSE.md)
+- **Model Description:** This is a model that can be used to generate and modify images based on text prompts. 
+It is a [Transformer Latent Diffusion Model](https://arxiv.org/abs/2310.00426) that uses one fixed, pretrained text encoders ([T5](
+https://huggingface.co/DeepFloyd/t5-v1_1-xxl))
+and one latent feature encoder ([VAE](https://arxiv.org/abs/2112.10752)).
+- **Resources for more information:** Check out our [PixArt-α](https://github.com/PixArt-alpha/PixArt-alpha), [LCM](https://github.com/luosiallen/latent-consistency-model) GitHub Repository
+and the [Pixart-α](https://arxiv.org/abs/2310.00426), [LCM](https://arxiv.org/abs/2310.04378) reports on arXiv.
+
+### Model Sources
+
+For research purposes, we recommend our `generative-models` Github repository (https://github.com/PixArt-alpha/PixArt-alpha), 
+which is more suitable for developing both training and inference designs.
+[Hugging Face](https://huggingface.co/spaces/PixArt-alpha/PixArt-LCM) provides free Pixart-LCM inference.
+- **Repository:** https://github.com/PixArt-alpha/PixArt-alpha
+- **Demo:** https://huggingface.co/spaces/PixArt-alpha/PixArt-LCM
+
+### 🧨 Diffusers 
+
+Make sure to upgrade diffusers to >= 0.23.0:
+```
+pip install -U diffusers --upgrade
+```
+
+In addition make sure to install `transformers`, `safetensors`, `sentencepiece`, and `accelerate`:
+```
+pip install transformers accelerate safetensors sentencepiece
+```
+
+To just use the base model, you can run:
+
+
+```python
+import torch
+from diffusers import PixArtAlphaPipeline
+
+# only 1024-MS version is supported for now
+pipe = PixArtAlphaPipeline.from_pretrained("PixArt-alpha/PixArt-LCM-XL-2-1024-MS", torch_dtype=torch.float16, use_safetensors=True)
+
+# Enable memory optimizations.
+pipe.enable_model_cpu_offload()
+
+prompt = "A small cactus with a happy face in the Sahara desert."
+image = pipe(prompt).images[0]
+```
+
+When using `torch >= 2.0`, you can improve the inference speed by 20-30% with torch.compile. Simple wrap the unet with torch compile before running the pipeline:
+```py
+pipe.transformer = torch.compile(pipe.transformer, mode="reduce-overhead", fullgraph=True)
+```
+
+If you are limited by GPU VRAM, you can enable *cpu offloading* by calling `pipe.enable_model_cpu_offload`
+instead of `.to("cuda")`:
+
+```diff
+- pipe.to("cuda")
++ pipe.enable_model_cpu_offload()
+```
+
+The diffusers use here is totally the same as the base-model PixArt-α.
+For more information on how to use Pixart-α with `diffusers`, please have a look at [the Pixart-α Docs](https://huggingface.co/docs/diffusers/main/en/api/pipelines/pixart).
+
+## Uses
+
+### Direct Use
+
+The model is intended for research purposes only. Possible research areas and tasks include
+
+- Generation of artworks and use in design and other artistic processes.
+- Applications in educational or creative tools.
+- Research on generative models.
+- Safe deployment of models which have the potential to generate harmful content.
+
+- Probing and understanding the limitations and biases of generative models.
+
+Excluded uses are described below.
+
+### Out-of-Scope Use
+
+The model was not trained to be factual or true representations of people or events, and therefore using the model to generate such content is out-of-scope for the abilities of this model.
+
+## Limitations and Bias
+
+### Limitations
+
+
+- The model does not achieve perfect photorealism
+- The model cannot render legible text
+- The model struggles with more difficult tasks which involve compositionality, such as rendering an image corresponding to “A red cube on top of a blue sphere”
+- fingers, .etc in general may not be generated properly.
+- The autoencoding part of the model is lossy.
+
+### Bias
+While the capabilities of image generation models are impressive, they can also reinforce or exacerbate social biases.