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README.md

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-license: apache-2.0
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+---
+license: apache-2.0
+---
+
+# Lumina-Next-T2I
+
+The `Lumina-Next-T2I` model that uses Next-DiT with a 2B parameters model as well as using [Gemma-2B](https://huggingface.co/google/gemma-2b) as a text encoder. Compared with `Lumina-T2I`, it has faster inference speed, richer generation style, and more multilingual support, etc.
+
+Our generative model has `Next-DiT` as the backbone, the text encoder is the `Gemma` 2B model, and the VAE uses a version of `sdxl` fine-tuned by stabilityai.
+
+- Generation Model: Next-DiT
+- Text Encoder: Gemma 2B
+- VAE: stabilityai/sd-vae-ft-sdxl
+
+## 📰 News
+
+- [2024-5-12] 🚀🚀🚀 We release the next version of `Lumina-T2I`, called `Lumina-Next-T2I` for faster and lower memory usage image generation model.
+
+## 🎮 Model Zoo
+
+More checkpoints of our model will be released soon~
+
+| Resolution | Next-DiT Parameter| Text Encoder | Prediction | Download URL  |
+| ---------- | ----------------------- | ------------ | -----------|-------------- |
+| 1024       | 2B             |    Gemma-2B  |   Rectified Flow | [hugging face](https://huggingface.co/Alpha-VLLM/Lumina-Next-T2I) |
+
+## Installation
+
+Before installation, ensure that you have a working ``nvcc``
+
+```bash
+# The command should work and show the same version number as in our case. (12.1 in our case).
+nvcc --version
+```
+
+On some outdated distros (e.g., CentOS 7), you may also want to check that a late enough version of
+``gcc`` is available
+
+```bash
+# The command should work and show a version of at least 6.0.
+# If not, consult distro-specific tutorials to obtain a newer version or build manually.
+gcc --version
+```
+
+Downloading Lumina-T2X repo from github:
+
+```bash
+git clone https://github.com/Alpha-VLLM/Lumina-T2X
+```
+
+### 1. Create a conda environment and install PyTorch
+
+Note: You may want to adjust the CUDA version [according to your driver version](https://docs.nvidia.com/deploy/cuda-compatibility/#default-to-minor-version).
+
+  ```bash
+  conda create -n Lumina_T2X -y
+  conda activate Lumina_T2X
+  conda install python=3.11 pytorch==2.1.0 torchvision==0.16.0 torchaudio==2.1.0 pytorch-cuda=12.1 -c pytorch -c nvidia -y
+  ```
+
+### 2. Install dependencies
+
+  ```bash
+  pip install diffusers fairscale accelerate tensorboard transformers gradio torchdiffeq click
+  ```
+
+  or you can use
+
+  ```bash
+  cd lumina_next_t2i
+  pip install -r requirements.txt
+  ```
+
+### 3. Install ``flash-attn``
+
+  ```bash
+  pip install flash-attn --no-build-isolation
+  ```
+
+### 4. Install [nvidia apex](https://github.com/nvidia/apex) (optional)
+
+>[!Warning]
+> While Apex can improve efficiency, it is *not* a must to make Lumina-T2X work.
+>
+> Note that Lumina-T2X works smoothly with either:
+> + Apex not installed at all; OR
+> + Apex successfully installed with CUDA and C++ extensions.
+>
+> However, it will fail when:
+> + A Python-only build of Apex is installed.
+> 
+> If the error `No module named 'fused_layer_norm_cuda'` appears, it typically means you are using a Python-only build of Apex. To resolve this, please run `pip uninstall apex`, and Lumina-T2X should then function correctly.
+
+You can clone the repo and install following the official guidelines (note that we expect a full
+build, i.e., with CUDA and C++ extensions)
+
+```bash
+pip install ninja
+git clone https://github.com/NVIDIA/apex
+cd apex
+# if pip >= 23.1 (ref: https://pip.pypa.io/en/stable/news/#v23-1) which supports multiple `--config-settings` with the same key... 
+pip install -v --disable-pip-version-check --no-cache-dir --no-build-isolation --config-settings "--build-option=--cpp_ext" --config-settings "--build-option=--cuda_ext" ./
+# otherwise
+pip install -v --disable-pip-version-check --no-cache-dir --no-build-isolation --global-option="--cpp_ext" --global-option="--cuda_ext" ./
+```
+
+## Inference
+
+To ensure that our generative model is ready to use right out of the box, we provide a user-friendly CLI program and a locally deployable Web Demo site.
+
+### CLI
+
+1. Install Lumina-T2I
+
+```bash
+pip install -e .
+```
+
+2. Prepare the pretrained model
+
+⭐⭐ (Recommanded) you can use huggingface_cli downloading our model:
+
+```bash
+huggingface-cli download --resume-download Alpha-VLLM/Lumina-T2I --local-dir /path/to/ckpt
+```
+
+or using git for cloning the model you want to use:
+
+```bash
+git clone https://huggingface.co/Alpha-VLLM/Lumina-T2I
+``` 
+
+1. Setting your personal inference configuration
+
+Update your own personal inference settings to generate different styles of images, checking `config/infer/config.yaml` for detailed settings. Detailed config structure:
+
+> `/path/to/ckpt` should be a directory containing `consolidated*.pth` and `model_args.pth`
+
+```yaml
+- settings:
+
+  model:
+    ckpt: "/path/to/ckpt"           # if ckpt is "", you should use `--ckpt` for passing model path when using `lumina` cli.
+    ckpt_lm: ""                     # if ckpt is "", you should use `--ckpt_lm` for passing model path when using `lumina` cli.
+    token: ""                       # if LLM is a huggingface gated repo, you should input your access token from huggingface and when token is "", you should `--token` for accessing the model.
+
+  transport:
+    path_type: "Linear"             # option: ["Linear", "GVP", "VP"]
+    prediction: "velocity"          # option: ["velocity", "score", "noise"]
+    loss_weight: "velocity"         # option: [None, "velocity", "likelihood"]
+    sample_eps: 0.1
+    train_eps: 0.2
+
+  ode:
+    atol: 1e-6                      # Absolute tolerance
+    rtol: 1e-3                      # Relative tolerance
+    reverse: false                  # option: true or false
+    likelihood: false               # option: true or false
+
+  sde:
+    sampling_method: "Euler"        # option: ["Euler", "Heun"]
+    diffusion_form: "sigma"         # option: ["constant", "SBDM", "sigma", "linear", "decreasing", "increasing-decreasing"]
+    diffusion_norm: 1.0             # range: 0-1
+    last_step: Mean                 # option: [None, "Mean", "Tweedie", "Euler"]
+    last_step_size: 0.04
+
+  infer:
+      resolution: "1024x1024"     # option: ["1024x1024", "512x2048", "2048x512", "(Extrapolation) 1664x1664", "(Extrapolation) 1024x2048", "(Extrapolation) 2048x1024"]
+      num_sampling_steps: 60      # range: 1-1000
+      cfg_scale: 4.               # range: 1-20
+      solver: "euler"             # option: ["euler", "dopri5", "dopri8"]
+      t_shift: 4                  # range: 1-20 (int only)
+      ntk_scaling: true           # option: true or false
+      proportional_attn: true     # option: true or false
+      seed: 0                     # rnage: any number
+```
+
+- model:
+  - `ckpt`: lumina-t2i checkpoint path from [huggingface repo](https://huggingface.co/Alpha-VLLM/Lumina-T2I) containing `consolidated*.pth` and `model_args.pth`.
+  - `ckpt_lm`: LLM checkpoint.
+  - `token`: huggingface access token for accessing gated repo.
+- transport: 
+  - `path_type`: the type of path for transport: 'Linear', 'GVP' (Geodesic Vector Pursuit), or 'VP' (Vector Pursuit).
+  - `prediction`: the prediction model for the transport dynamics.
+  - `loss_weight`: the weighting of different components in the loss function, can be 'velocity' for dynamic modeling, 'likelihood' for statistical consistency, or None for no weighting
+  - `sample_eps`: sampling in the transport model.
+  - `train_eps`: training to stabilize the learning process.
+- ode:
+  - `atol`: Absolute tolerance for the ODE solver. (options: ["Linear", "GVP", "VP"])
+  - `rtol`: Relative tolerance for the ODE solver. (option: ["velocity", "score", "noise"])
+  - `reverse`: run the ODE solver in reverse. (option: [None, "velocity", "likelihood"])
+  - `likelihood`: Enable calculation of likelihood during the ODE solving process.
+- sde
+  - `sampling-method`: the numerical method used for sampling the stochastic differential equation: 'Euler' for simplicity or 'Heun' for improved accuracy.
+  - `diffusion-form`: form of diffusion coefficient in the SDE
+  - `diffusion-norm`: Normalizes the diffusion coefficient, affecting the scale of the stochastic component.
+  - `last-step`: form of last step taken in the SDE
+  - `last-step-size`: size of the last step taken
+- infer
+  - `resolution`: generated image resolution.
+  - `num_sampling_steps`: sampling step for generating image.
+  - `cfg_scale`: classifier-free guide scaling factor
+  - `solver`: solver for image generation.
+  - `t_shift`: time shift factor.
+  - `ntk_scaling`: ntk rope scaling factor.
+  - `proportional_attn`: Whether to use proportional attention.
+  - `seed`: random initialization seeds.
+
+1. Run with CLI
+
+inference command:
+```bash
+lumina_next infer -c <config_path> <caption_here> <output_dir>
+```
+
+e.g. Demo command:
+
+```bash
+cd lumina_next_t2i
+lumina_next infer -c "config/infer/settings.yaml" "a snow man of ..." "./outputs"
+```
+
+### Web Demo
+
+To host a local gradio demo for interactive inference, run the following command:
+
+```bash
+# `/path/to/ckpt` should be a directory containing `consolidated*.pth` and `model_args.pth`
+
+# default
+python -u demo.py --ckpt "/path/to/ckpt"
+
+# the demo by default uses bf16 precision. to switch to fp32:
+python -u demo.py --ckpt "/path/to/ckpt" --precision fp32 
+
+# use ema model
+python -u demo.py --ckpt "/path/to/ckpt" --ema
+```