# Commands

- [Config](#Config)
- [Inference](#inference)
  - [Inference with Open-Sora 1.2](#inference-with-open-sora-12)
  - [Inference with Open-Sora 1.1](#inference-with-open-sora-11)
  - [Inference with DiT pretrained on ImageNet](#inference-with-dit-pretrained-on-imagenet)
  - [Inference with Latte pretrained on UCF101](#inference-with-latte-pretrained-on-ucf101)
  - [Inference with PixArt-α pretrained weights](#inference-with-pixart-α-pretrained-weights)
  - [Inference with checkpoints saved during training](#inference-with-checkpoints-saved-during-training)
  - [Inference Hyperparameters](#inference-hyperparameters)
- [Training](#training)
  - [Training Hyperparameters](#training-hyperparameters)
- [Search batch size for buckets](#search-batch-size-for-buckets)

## Config
Note that currently our model loading for vae and diffusion model supports two types:

* load from local file path
* load from huggingface

Our config supports loading from huggingface online image by default.
If you wish to load from a local path downloaded from huggingface image, you need to set `force_huggingface=True`, for instance:

```python
# for vae
vae = dict(
    type="OpenSoraVAE_V1_2",
    from_pretrained="/root/commonData/OpenSora-VAE-v1.2",
    micro_frame_size=17,
    micro_batch_size=4,
    force_huggingface=True, # NOTE: set here
)
# for diffusion model
model = dict(
    type="STDiT3-XL/2",
    from_pretrained="/root/commonData/OpenSora-STDiT-v3",
    qk_norm=True,
    enable_flash_attn=True,
    enable_layernorm_kernel=True,
    force_huggingface=True, # NOTE: set here
)
```
However, if you want to load a self-trained model, do not set `force_huggingface=True` since your image won't be in huggingface format.

## Inference

You can modify corresponding config files to change the inference settings. See more details [here](/docs/structure.md#inference-config-demos).

### Inference with Open-Sora 1.2

The inference API is compatible with Open-Sora 1.1. To ease users' experience, we add support to `--resolution` and `--aspect-ratio` options, which is a more user-friendly way to specify the image size.

```bash
python scripts/inference.py configs/opensora-v1-2/inference/sample.py \
    --resolution 480p --aspect-ratio 9:16
# equivalent to
python scripts/inference.py configs/opensora-v1-2/inference/sample.py \
    --image-size 480 853
```

In this version, we have merged all functions in previous `inference-long.py` into `inference.py`. The command line arguments are the same as before (only note that the frame index and length is calculated with 4x compressed).

### Inference with Open-Sora 1.1

Since Open-Sora 1.1 supports inference with dynamic input size, you can pass the input size as an argument.

```bash
# image sampling with prompt path
python scripts/inference.py configs/opensora-v1-1/inference/sample.py \
    --ckpt-path CKPT_PATH --prompt-path assets/texts/t2i_samples.txt --num-frames 1 --image-size 1024 1024

# image sampling with prompt
python scripts/inference.py configs/opensora-v1-1/inference/sample.py \
    --ckpt-path CKPT_PATH --prompt "A beautiful sunset over the city" --num-frames 1 --image-size 1024 1024

# video sampling
python scripts/inference.py configs/opensora-v1-1/inference/sample.py \
    --ckpt-path CKPT_PATH --prompt "A beautiful sunset over the city" --num-frames 16 --image-size 480 854
```

You can adjust the `--num-frames` and `--image-size` to generate different results. We recommend you to use the same image size as the training resolution, which is defined in [aspect.py](/opensora/datasets/aspect.py). Some examples are shown below.

- 240p
  - 16:9 240x426
  - 3:4 276x368
  - 1:1 320x320
- 480p
  - 16:9 480x854
  - 3:4 554x738
  - 1:1 640x640
- 720p
  - 16:9 720x1280
  - 3:4 832x1110
  - 1:1 960x960

`inference-long.py` is compatible with `inference.py` and supports advanced features.

```bash
# image condition
python scripts/inference-long.py configs/opensora-v1-1/inference/sample.py --ckpt-path CKPT_PATH \
  --num-frames 32 --image-size 240 426 --sample-name image-cond \
  --prompt 'A breathtaking sunrise scene.{"reference_path": "assets/images/condition/wave.png","mask_strategy": "0"}'

# video extending
python scripts/inference-long.py configs/opensora-v1-1/inference/sample.py --ckpt-path CKPT_PATH \
  --num-frames 32 --image-size 240 426 --sample-name image-cond \
  --prompt 'A car driving on the ocean.{"reference_path": "https://cdn.openai.com/tmp/s/interp/d0.mp4","mask_strategy": "0,0,0,-8,8"}'

# long video generation
python scripts/inference-long.py configs/opensora-v1-1/inference/sample.py --ckpt-path CKPT_PATH \
  --num-frames 32 --image-size 240 426 --loop 16 --condition-frame-length 8 --sample-name long \
  --prompt '|0|a white jeep equipped with a roof rack driving on a dirt road in a coniferous forest.|2|a white jeep equipped with a roof rack driving on a dirt road in the desert.|4|a white jeep equipped with a roof rack driving on a dirt road in a mountain.|6|A white jeep equipped with a roof rack driving on a dirt road in a city.|8|a white jeep equipped with a roof rack driving on a dirt road on the surface of a river.|10|a white jeep equipped with a roof rack driving on a dirt road under the lake.|12|a white jeep equipped with a roof rack flying into the sky.|14|a white jeep equipped with a roof rack driving in the universe. Earth is the background.{"reference_path": "https://cdn.openai.com/tmp/s/interp/d0.mp4", "mask_strategy": "0,0,0,0,16"}'

# video connecting
python scripts/inference-long.py configs/opensora-v1-1/inference/sample.py --ckpt-path CKPT_PATH \
  --num-frames 32 --image-size 240 426 --sample-name connect \
  --prompt 'A breathtaking sunrise scene.{"reference_path": "assets/images/condition/sunset1.png;assets/images/condition/sunset2.png","mask_strategy": "0;0,1,0,-1,1"}'

# video editing
python scripts/inference-long.py configs/opensora-v1-1/inference/sample.py --ckpt-path CKPT_PATH \
  --num-frames 32 --image-size 480 853 --sample-name edit \
  --prompt 'A cyberpunk-style city at night.{"reference_path": "https://cdn.pixabay.com/video/2021/10/12/91744-636709154_large.mp4","mask_strategy": "0,0,0,0,32,0.4"}'
```

### Inference with DiT pretrained on ImageNet

The following command automatically downloads the pretrained weights on ImageNet and runs inference.

```bash
python scripts/inference.py configs/dit/inference/1x256x256-class.py --ckpt-path DiT-XL-2-256x256.pt
```

### Inference with Latte pretrained on UCF101

The following command automatically downloads the pretrained weights on UCF101 and runs inference.

```bash
python scripts/inference.py configs/latte/inference/16x256x256-class.py --ckpt-path Latte-XL-2-256x256-ucf101.pt
```

### Inference with PixArt-α pretrained weights

Download T5 into `./pretrained_models` and run the following command.

```bash
# 256x256
torchrun --standalone --nproc_per_node 1 scripts/inference.py configs/pixart/inference/1x256x256.py --ckpt-path PixArt-XL-2-256x256.pth

# 512x512
torchrun --standalone --nproc_per_node 1 scripts/inference.py configs/pixart/inference/1x512x512.py --ckpt-path PixArt-XL-2-512x512.pth

# 1024 multi-scale
torchrun --standalone --nproc_per_node 1 scripts/inference.py configs/pixart/inference/1x1024MS.py --ckpt-path PixArt-XL-2-1024MS.pth
```

### Inference with checkpoints saved during training

During training, an experiment logging folder is created in `outputs` directory. Under each checkpoint folder, e.g. `epoch12-global_step2000`, there is a `ema.pt` and the shared `model` folder. Run the following command to perform inference.

```bash
# inference with ema model
torchrun --standalone --nproc_per_node 1 scripts/inference.py configs/opensora/inference/16x256x256.py --ckpt-path outputs/001-STDiT-XL-2/epoch12-global_step2000/ema.pt

# inference with model
torchrun --standalone --nproc_per_node 1 scripts/inference.py configs/opensora/inference/16x256x256.py --ckpt-path outputs/001-STDiT-XL-2/epoch12-global_step2000

# inference with sequence parallelism
# sequence parallelism is enabled automatically when nproc_per_node is larger than 1
torchrun --standalone --nproc_per_node 2 scripts/inference.py configs/opensora/inference/16x256x256.py --ckpt-path outputs/001-STDiT-XL-2/epoch12-global_step2000
```

The second command will automatically generate a `model_ckpt.pt` file in the checkpoint folder.

### Inference Hyperparameters

1. DPM-solver is good at fast inference for images. However, the video result is not satisfactory. You can use it for fast demo purpose.

```python
type="dmp-solver"
num_sampling_steps=20
```

2. You can use [SVD](https://huggingface.co/stabilityai/stable-video-diffusion-img2vid-xt)'s finetuned VAE decoder on videos for inference (consumes more memory). However, we do not see significant improvement in the video result. To use it, download [the pretrained weights](https://huggingface.co/maxin-cn/Latte/tree/main/t2v_required_models/vae_temporal_decoder) into `./pretrained_models/vae_temporal_decoder` and modify the config file as follows.

```python
vae = dict(
    type="VideoAutoencoderKLTemporalDecoder",
    from_pretrained="pretrained_models/vae_temporal_decoder",
)
```

## Training

To resume training, run the following command. ``--load`` different from ``--ckpt-path`` as it loads the optimizer and dataloader states.

```bash
torchrun --nnodes=1 --nproc_per_node=8 scripts/train.py configs/opensora/train/64x512x512.py --data-path YOUR_CSV_PATH --load YOUR_PRETRAINED_CKPT
```

To enable wandb logging, add `--wandb` to the command.

```bash
WANDB_API_KEY=YOUR_WANDB_API_KEY torchrun --nnodes=1 --nproc_per_node=8 scripts/train.py configs/opensora/train/64x512x512.py --data-path YOUR_CSV_PATH --wandb True
```

You can modify corresponding config files to change the training settings. See more details [here](/docs/structure.md#training-config-demos).

### Training Hyperparameters

1. `dtype` is the data type for training. Only `fp16` and `bf16` are supported. ColossalAI automatically enables the mixed precision training for `fp16` and `bf16`. During training, we find `bf16` more stable.

## Search batch size for buckets

To search the batch size for buckets, run the following command.

```bash
torchrun --standalone --nproc_per_node 1 scripts/misc/search_bs.py configs/opensora-v1-2/misc/bs.py --data-path /mnt/nfs-207/sora_data/meta/searchbs.csv
```

Here, your data should be a small one for searching purposes.

To control the batch size search range, you should specify `bucket_config` in the config file, where the value tuple is `(guess_value, range)` and the search will be performed in `guess_value±range`.

Here is an example of the bucket config:

```python
bucket_config = {
  "240p": {
        1: (100, 100),
        51: (24, 10),
        102: (12, 10),
        204: (4, 8),
        408: (2, 8),
    },
    "480p": {
        1: (50, 50),
        51: (6, 6),
        102: (3, 3),
        204: (1, 2),
    },
}
```

You can also specify a resolution to search for parallelism.

```bash
torchrun --standalone --nproc_per_node 1 scripts/misc/search_bs.py configs/opensora-v1-2/misc/bs.py --data-path /mnt/nfs-207/sora_data/meta/searchbs.csv --resolution 240p
```

The searching goal should be specified in the config file as well. There are two ways:

1. Specify a `base_step_time` in the config file. The searching goal is to find the batch size that can achieve the `base_step_time` for each bucket.
2. If `base_step_time` is not specified, it will be determined by `base` which is a tuple of `(batch_size, step_time)`. The step time is the maximum batch size allowed for the bucket.

The script will print the best batch size (and corresponding step time) for each bucket and save the output config file. Note that we assume a larger batch size is better, so the script use binary search to find the best batch size.