# Cache Strategy Guide for DreamDojo

`video_gen_physics/README_cache.md` is the authoritative document for DreamDojo cache backends in this workspace.

The legacy snapshot under `world_cache/VLA-Humanoid/Models/DreamDojo` is kept only as historical reference. The primary code path now lives in:

- `video_gen_physics/methods/cache_strategy/WorldCache`
- `video_gen_physics/methods/cache_strategy/DiCache`
- `video_gen_physics/models/DreamDojo`

## Scope

This integration targets the DreamDojo action-conditioned inference path in `video_gen_physics/models/DreamDojo`.

It does not change the generic `cosmos_predict2/inference.py` flow.

Cache backends are treated as inference-only and v1 single-GPU only.

## Backend Rules

The DreamDojo action-conditioned path treats the following acceleration families as mutually exclusive:

- `WorldCache`
- `DiCache`
- `FasterCache`
- `SiTo`
- `SVG`
- `ITM`
- dense-vs-sparse backend overrides such as `NATTEN`

If a cache backend is enabled, DreamDojo will require dense `minimal_a2a` attention at runtime.

## Model Geometry

The recommended cache thresholds should be reasoned from DreamDojo latent token geometry, not from raw pixel frames alone.

For the current DreamDojo GR1 action-conditioned path:

- tokenizer spatial compression = `8`
- latent patch spatial = `2`
- effective spatial token factor = `16`
- temporal compression = `4`

Sequence length is:

```text
S = state_t * (H / 16) * (W / 16)
```

For the common GR1 evaluation setting:

- pixel resolution = `480 x 640`
- pixel frames per chunk = `13`
- latent frames = `state_t = 1 + 12 // 4 = 4`

So:

```text
S = 4 * (480 / 16) * (640 / 16)
  = 4 * 30 * 40
  = 4800 tokens
```

This is the reference geometry used for the starting values below.

## Tuning Defaults

These are recommended starting points derived from:

- DreamDojo latent geometry in this repo
- WorldCache, arXiv `2603.22286`, published March 23, 2026
- DiCache, arXiv `2508.17356`, published August 24, 2025

They should be treated as starting points, not as verified benchmark claims for this workspace. Local checkpoints were not available during this integration pass, so no local speed or quality claim is asserted here.

### WorldCache

> **Note on threshold calibration for this repo**
>
> The `VLA-Humanoid` reference repo contained two math bugs that artificially inflated
> the cache hit rate when using `--worldcache-rel-l1-thresh 0.03`:
>
> 1. **`num_steps` miscounting**: Sequential CFG produces 70 forward passes but the
>    original code set `worldcache_num_steps=35`, causing the drift accumulator to
>    reset halfway through — effectively running two "easy" warm-up windows.
> 2. **`t_embedding_norm` order**: The original code mixed `action_emb` *after*
>    `t_embedding_norm`, which suppressed timestep-to-timestep variance and made
>    `delta_y` scores fall below `0.03` very easily.
>
> Both bugs are **fixed** in this repo. As a result the threshold must be raised to
> achieve the same skip rate (≈30–40%) and the same ≈6–7 it/s throughput.
> **Do not use 0.03 here** — it will give only ~8% skip and roughly half the speed.

Recommended starting values for **this repo**:

- 2B / 7B, `28` blocks:
  - `--worldcache-probe-depth 4`
  - `--worldcache-ret-ratio 0.5`
  - `--worldcache-rel-l1-thresh 0.08`
- 14B, `36` blocks:
  - `--worldcache-probe-depth 6`
  - `--worldcache-ret-ratio 0.5`
  - `--worldcache-rel-l1-thresh 0.065`

Interpretation:

- `probe_depth=4` covers ~14% of the 28-block stack — enough to measure drift cheaply.
- `ret_ratio=0.5` means the first 50% of timesteps (17/35) always run full forward;
  reuse only starts mid-denoising when the latent is already converging.
- `rel_l1_thresh` is now correctly calibrated against the normalized `t_embedding`
  distribution. Values in `[0.05, 0.12]` are the practical operating range:
  - lower → fewer skips, higher quality, slower
  - higher → more skips, potential drift artifacts, faster

Optional quality guards (activate in order if needed):

- `--worldcache-hf-enabled` — blocks skips when high-frequency edge detail drifts
- `--worldcache-saliency-enabled` — weights drift by per-channel variance saliency
- `--worldcache-dynamic-decay` — relaxes threshold linearly toward end of denoising
- `--worldcache-aduc-enabled` — skips the unconditional branch at late timesteps

### DiCache

Recommended starting values:

- 2B / 7B, `28` blocks:
  - `--dicache-probe-depth 2`
  - `--dicache-ret-ratio 0.2`
  - `--dicache-rel-l1-thresh 0.08`
- 14B, `36` blocks:
  - `--dicache-probe-depth 3`
  - `--dicache-ret-ratio 0.22`
  - `--dicache-rel-l1-thresh 0.07`

Interpretation:

- DiCache uses a shallower probe and simpler reuse schedule than WorldCache.
- It is usually the safer first cache baseline if you want minimal tuning.

### FasterCache

Recommended starting values:

- `--use_fastercache`
- `--fastercache_start_step 0`
- `--fastercache_model_interval 5`
- `--fastercache_block_interval 3`

Interpretation:

- `fastercache_start_step=0` auto-resolves to `ceil(0.3 * num_inference_steps)`.
- Model-level FasterCache only shortcuts the unconditional CFG branch on non-anchor denoising steps.
- Block-level FasterCache is self-attention only and stays disabled for short sequences.
- For the common GR1 action-conditioned setting in this repo, `seq_len = 4800`, so the block-level path is eligible.

## Threshold Scaling Rule

For other sequence lengths, start from the `S = 4800` reference and rescale the threshold as:

```text
thresh_scaled = thresh_ref * sqrt(4800 / S)
```

Practical guidance:

- If `S` increases, decrease the threshold.
- If the dataset has stronger motion, decrease the threshold further.
- If `num_latent_conditional_frames = 2`, decrease the threshold further because temporal change is less stationary.
- If quality drifts too much, lower threshold before increasing probe depth.
- If speedup is too weak but quality is stable, raise `ret_ratio` carefully only after threshold is already reasonable.

## Runtime Notes

- Cache `num_steps` must match the denoising step count used by the sampler.
- In the current DreamDojo action-conditioned path, the cache config drives the effective denoising step count for cache-enabled runs.
- `worldcache_parallel_cfg` means batched cond/uncond classifier-free guidance in one forward pass. It is not multi-GPU context parallelism.
- Cache backends are currently blocked when `context_parallel_size > 1`.

## How To Run

Run from the `video_gen_physics` root, consistent with the other method READMEs:

```bash
source /pfss/mlde/workspaces/mlde_wsp_IAS_SAMMerge/VLA/doanh/video_world/video_gen_physics/models/DreamDojo/.venv/bin/activate
cd /pfss/mlde/workspaces/mlde_wsp_IAS_SAMMerge/VLA/doanh/video_world/video_gen_physics
export PYTHONPATH="./models/DreamDojo:${PYTHONPATH}"
```

### Baseline (DreamDojo)

```bash
python -m models.DreamDojo.examples.action_conditioned \
  -o ./output/action_conditioned/cache_baseline \
  --checkpoints-dir ./checkpoints/dreamdojo/2B_GR1_post-train \
  --experiment dreamdojo_2b_480_640_gr1 \
  --save-dir ./output/dreamdojo_cache/baseline \
  --num-frames 49 \
  --num-samples 65 \
  --dataset-path ./checkpoints/dreamdojo/datasets/PhysicalAI-Robotics-GR00T-Teleop-GR1/GR1_robot \
  --data-split test \
  --deterministic-uniform-sampling
```

### DiCache (DreamDojo)

```bash
python -m models.DreamDojo.examples.action_conditioned \
  -o ./output/action_conditioned/cache_dicache \
  --checkpoints-dir ./checkpoints/dreamdojo/2B_GR1_post-train \
  --experiment dreamdojo_2b_480_640_gr1 \
  --save-dir ./output/dreamdojo_cache/dicache \
  --num-frames 49 \
  --num-samples 65 \
  --dataset-path ./checkpoints/dreamdojo/datasets/PhysicalAI-Robotics-GR00T-Teleop-GR1/GR1_robot \
  --data-split test \
  --deterministic-uniform-sampling \
  --dicache-enabled \
  --dicache-num-steps 35 \
  --dicache-probe-depth 2 \
  --dicache-ret-ratio 0.2 \
  --dicache-rel-l1-thresh 0.08
```

### WorldCache (DreamDojo)

```bash
python -m models.DreamDojo.examples.action_conditioned \
  -o ./output/action_conditioned/cache_worldcache \
  --checkpoints-dir ./checkpoints/dreamdojo/2B_GR1_post-train \
  --experiment dreamdojo_2b_480_640_gr1 \
  --save-dir ./output/dreamdojo_cache/worldcache \
  --num-frames 49 \
  --num-samples 65 \
  --dataset-path ./checkpoints/dreamdojo/datasets/PhysicalAI-Robotics-GR00T-Teleop-GR1/GR1_robot \
  --data-split test \
  --deterministic-uniform-sampling \
  --worldcache-enabled \
  --worldcache-num-steps 35 \
  --worldcache-rel-l1-thresh 0.065 \
  --worldcache-motion-sensitivity 3.0 \
  --worldcache-probe-depth 4 \
  --worldcache-ret-ratio 0.5
```
## How To Run (DreamGen 2.0 / GR00T)

The `cache_strategy` module is also natively integrated into the `models/dreamgen/examples/` pipeline. Below is an example applying **WorldCache** to the `video2world_gr00t.py` script.

> **Note**: For `DreamGen`, make sure `PYTHONPATH` points to the workspace root rather than `models/DreamDojo`.

```bash
cd /pfss/mlde/workspaces/mlde_wsp_IAS_SAMMerge/VLA/doanh/video_world/video_gen_physics

export PYTHONPATH="./models/dreamgen"

# Execute text/image-to-world with 14B GR00T
torchrun -m models.dreamgen.examples.video2world_gr00t \
    --model_size 14B \
    --gr00t_variant gr1 \
    --batch_input_json ./output/dream_gen_benchmark/cosmos_predict2_14b_gr1_behavior/batch_input.json \
    --disable_guardrail \
    --num_gpus 1 \
    --worldcache-enabled \
    --worldcache-num-steps 35 \
    --worldcache-rel-l1-thresh 0.08 \
    --worldcache-ret-ratio 0.5 \
    --worldcache-probe-depth 4 \
    --worldcache-motion-sensitivity 4.0 \
    --worldcache-dynamic-decay
--->>> Total inference time: 347.0921 seconds

torchrun -m models.dreamgen.examples.video2world_gr00t \
    --model_size 14B \
    --gr00t_variant gr1 \
    --batch_input_json ./output/dream_gen_benchmark_world_cache/cosmos_predict2_14b_gr1_behavior/batch_input.json \
    --disable_guardrail \
    --num_gpus 1 \
    --worldcache-enabled \
    --worldcache-num-steps 35 \
    --worldcache-rel-l1-thresh 0.06 \
    --worldcache-ret-ratio 0.6 \
    --worldcache-probe-depth 6 \
    --worldcache-motion-sensitivity 5.0 \
    --worldcache-dynamic-decay
--->>> Total inference time: 399.7761 seconds 

torchrun -m models.dreamgen.examples.video2world_gr00t \
    --model_size 14B \
    --gr00t_variant gr1 \
    --batch_input_json ./output/dream_gen_benchmark_world_cache/cosmos_predict2_14b_gr1_behavior/batch_input.json \
    --disable_guardrail \
    --num_gpus 1 \
    --worldcache-enabled \
    --worldcache-num-steps 35 \
    --worldcache-rel-l1-thresh 0.05 \
    --worldcache-ret-ratio 0.65 \
    --worldcache-probe-depth 7 \
    --worldcache-motion-sensitivity 5.0 \
    --worldcache-dynamic-decay
--> Total inference time: 408.3197 seconds

torchrun -m models.dreamgen.examples.video2world_gr00t \
    --model_size 14B \
    --gr00t_variant gr1 \
    --batch_input_json ./output/dream_gen_benchmark_world_cache/cosmos_predict2_14b_gr1_behavior/batch_input.json \
    --disable_guardrail \
    --num_gpus 1 \
    --worldcache-enabled \
    --worldcache-num-steps 35 \
    --worldcache-rel-l1-thresh 0.05 \
    --worldcache-ret-ratio 0.55 \
    --worldcache-probe-depth 10 \
    --worldcache-motion-sensitivity 7.0 \
    --worldcache-dynamic-decay
--> Total inference time: 413.3745 seconds                                               

torchrun -m models.dreamgen.examples.video2world_gr00t \
    --model_size 14B \
    --gr00t_variant gr1 \
    --batch_input_json ./output/dream_gen_benchmark_world_cache/cosmos_predict2_14b_gr1_behavior/batch_input.json \
    --disable_guardrail \
    --num_gpus 1 \
    --worldcache-enabled \
    --worldcache-num-steps 35 \
    --worldcache-rel-l1-thresh 0.03 \
    --worldcache-ret-ratio 0.6 \
    --worldcache-probe-depth 15 \
    --worldcache-motion-sensitivity 9.0 \
    --worldcache-dynamic-decay

```
Nếu đang dùng WorldCache, tham số chính để skip mạnh hơn là --worldcache-rel-l1-thresh. Tăng cái này trước.

Với config hiện tại của bạn 0.065 / 6 / 0.5, thứ tự chỉnh nên là:

Tăng --worldcache-rel-l1-thresh lên 0.075, rồi 0.08, nếu còn muốn mạnh nữa thì 0.085.
Giảm --worldcache-ret-ratio từ 0.5 xuống 0.4 hoặc 0.35.
Giảm --worldcache-probe-depth từ 6 xuống 5 hoặc 4.
Giảm --worldcache-motion-sensitivity từ 5.0 xuống 3.0 nếu muốn cache bớt nhạy với motion.
Bật --worldcache-dynamic-decay nếu muốn skip mạnh hơn về cuối denoise.
Bật --worldcache-aduc-enabled nếu muốn tăng tốc thêm nhánh uncond ở cuối, nhưng đây không phải full-step skip.

### FasterCache (DreamGen)

Baseline:
```bash
torchrun -m models.dreamgen.examples.video2world_gr00t     --model_size 14B     --gr00t_variant gr1     --batch_input_json ./output/dream_gen_benchmark/cosmos_predict2_14b_gr1_behavior/batch_input.json     --disable_guardrail     --num_gpus 1 

```
[04-23 04:09:25|INFO|models/dreamgen/cosmos_predict2/models/text2image_dit.py:1779:forward] DiT Blocks time: 7.1864 seconds
[04-23 04:09:25|INFO|models/dreamgen/cosmos_predict2/models/text2image_dit.py:1781:forward]   - Total Self-Attention: 4.5648s


FasterCache acceleration is also supported in the DreamGen pipeline. Note that FasterCache v1 is currently limited to single-GPU inference.

```bash
export PYTHONPATH="./models/dreamgen:${PYTHONPATH}"

# Execute with FasterCache enabled (Optimized for speed)
torchrun -m models.dreamgen.examples.video2world_gr00t \
    --model_size 14B \
    --gr00t_variant gr1 \
    --batch_input_json ./output/dream_gen_benchmark/cosmos_predict2_14b_gr1_behavior/batch_input.json \
    --disable_guardrail \
    --num_gpus 1 \
    --use_fastercache \
    --fastercache_model_interval 10 \
    --fastercache_block_interval 6 \
    --fastercache_debug
] Total inference time: 375.0514 seconds 

**Giải thích các thông số FasterCache và cách tune để tăng chất lượng ("tối ưu quality hơn"):**

- `--fastercache_start_step`: Bước (timestep) bắt đầu bật cache. Các bước đầu tiên của diffusion cực kỳ quan trọng để định hình cấu trúc và chi tiết của video.
  - **Cách tune để tăng quality:** Tăng giá trị này lên (ví dụ từ 0 hoặc 5 lên `10` hoặc `15`). Chạy đầy đủ không cache ở các bước đầu càng nhiều thì video xuất ra càng đẹp, sắc nét và bám sát prompt, đánh đổi lại là tốc độ giảm đi đôi chút.
- `--fastercache_model_interval`: Khoảng cách số bước để model tính toán lại hoàn toàn nhánh *unconditional* (thay vì skip và dùng FFT deltas tính từ nhánh conditional).
  - **Cách tune để tăng quality:** Giảm giá trị này xuống (ví dụ từ 10 xuống `3` hoặc `2`). Cập nhật nhánh uncond thường xuyên hơn giúp Classifier-Free Guidance (CFG) ổn định hơn, tránh vỡ hình ảnh.
- `--fastercache_block_interval`: Khoảng cách số bước để tính toán lại chính xác *Self-Attention* trong các DiT blocks (thay vì dùng lại output của các bước trước).
  - **Cách tune để tăng quality:** Giảm giá trị này xuống (ví dụ từ 6 xuống `4` hoặc `3`). Giúp các token duy trì liên kết không gian - thời gian tốt hơn, giảm hiện tượng bóng mờ (ghosting) hoặc nhiễu chi tiết.

--> Ví dụ lệnh chạy tối ưu quality hơn (chậm hơn một chút nhưng chi tiết tốt hơn):
```bash
torchrun -m models.dreamgen.examples.video2world_gr00t \
    --model_size 14B \
    --gr00t_variant gr1 \
    --batch_input_json ./output/dream_gen_benchmark/cosmos_predict2_14b_gr1_behavior/batch_input.json \
    --disable_guardrail \
    --num_gpus 1 \
    --use_fastercache \
    --fastercache_start_step 10 \
    --fastercache_model_interval 3 \
    --fastercache_block_interval 3 \
    --fastercache_debug
--->>> Total inference time: 461.3048 seconds 
torchrun -m models.dreamgen.examples.video2world_gr00t \
    --model_size 14B \
    --gr00t_variant gr1 \
    --batch_input_json ./output/dream_gen_benchmark/cosmos_predict2_14b_gr1_behavior/batch_input.json \
    --disable_guardrail \
    --num_gpus 1 \
    --use_fastercache \
    --fastercache_start_step 12 \
    --fastercache_model_interval 2  \
    --fastercache_block_interval 3 \
    --fastercache_debug
Total inference time: 516.1998 seconds
```


> Same DiCache flags (`--dicache-enabled`, etc.) seamlessly apply to DreamGen scripts.

### FasterCache

```bash
export PYTHONPATH="./models/DreamDojo:${PYTHONPATH}"
python -m models.DreamDojo.examples.action_conditioned \
  -o ./output/action_conditioned/cache_fastercache \
  --checkpoints-dir ./checkpoints/dreamdojo/2B_GR1_post-train \
  --experiment dreamdojo_2b_480_640_gr1 \
  --save-dir ./output/dreamdojo_cache/fastercache \
  --num-frames 49 \
  --num-samples 65 \
  --dataset-path ./checkpoints/dreamdojo/datasets/PhysicalAI-Robotics-GR00T-Teleop-GR1/GR1_robot \
  --data-split test \
  --deterministic-uniform-sampling \
  --fastercache-enabled \
  --fastercache-debug \
  --fastercache_start_step 0 \
  --fastercache_model_interval 2 \
  --fastercache_block_interval 5
```

## Ctrl-World Cache Backends

Run from the `video_gen_physics` root:

```bash
source /pfss/mlde/workspaces/mlde_wsp_IAS_SAMMerge/VLA/doanh/video_world/video_gen_physics/models/DreamDojo/.venv/bin/activate
cd /pfss/mlde/workspaces/mlde_wsp_IAS_SAMMerge/VLA/doanh/video_world/video_gen_physics
export PYTHONPATH="./models/Ctrl-World:${PYTHONPATH}"
```

Ctrl-World cache backends are inference-only and mutually exclusive with `PISA`, `Radial`, `SVG`, `SiTo`, `ITM`, and `FasterCache`.

### Ctrl-World DiCache

```bash
python models/Ctrl-World/scripts/rollout_interact_pi.py \
  --dataset_root_path ./models/Ctrl-World/dataset_example \
  --dataset_meta_info_path ./models/Ctrl-World/dataset_meta_info \
  --dataset_names ./models/Ctrl-World/droid_subset \
  --svd_model_path ./checkpoints/stabilityai/stable-video-diffusion-img2vid \
  --clip_model_path ./checkpoints/openai/clip-vit-base-patch32 \
  --ckpt_path ./checkpoints/ctrl_world/Ctrl-World/checkpoint-10000.pt \
  --task_type pickplace \
  --use_dicache \
  --dicache_rel_l1_thresh 0.08 \
  --dicache_ret_ratio 0.2 \
  --dicache_probe_depth 2
```

### Ctrl-World WorldCache

```bash
python models/Ctrl-World/scripts/rollout_replay_traj.py \
  --dataset_root_path ./models/Ctrl-World/dataset_example \
  --dataset_meta_info_path ./models/Ctrl-World/dataset_meta_info \
  --dataset_names ./models/Ctrl-World/droid_subset \
  --svd_model_path ./checkpoints/stabilityai/stable-video-diffusion-img2vid \
  --clip_model_path ./checkpoints/openai/clip-vit-base-patch32 \
  --ckpt_path ./checkpoints/ctrl_world/Ctrl-World/checkpoint-10000.pt \
  --use_worldcache \
  --worldcache_rel_l1_thresh 0.03 \
  --worldcache_ret_ratio 0.4 \
  --worldcache_probe_depth 3 \
  --worldcache_motion_sensitivity 5.0
```


## Suggested Tuning Order

For `WorldCache`:

1. Fix `num_steps`
2. Start with the recommended `probe_depth`
3. Tune `rel_l1_thresh`
4. Then tune `ret_ratio`
5. Only then try `hf`, `saliency`, `dynamic_decay`, or `aduc`

For `DiCache`:

1. Fix `num_steps`
2. Start with the recommended `probe_depth`
3. Tune `rel_l1_thresh`
4. Tune `ret_ratio` last

## Verification Checklist

When checkpoints become available locally, compare:

- baseline wall time
- cache wall time
- skip ratio from runtime logs
- output PSNR / SSIM / LPIPS artifacts already produced by the DreamDojo eval path

Keep prompt, chunking, checkpoint, dataset split, and seed policy fixed across comparisons.


torchrun -m models.dreamgen.examples.video2world_gr00t \
    --model_size 14B \
    --gr00t_variant gr1 \
    --batch_input_json ./output/dream_gen_benchmark/cosmos_predict2_14b_gr1_behavior/batch_input.json \
    --disable_guardrail \
    --num_gpus 1 \
    --dicache-enabled \
    --dicache-num-steps 35 \
    --dicache-probe-depth 2 \
    --dicache-ret-ratio 0.2 \
    --dicache-rel-l1-thresh 0.08

    
---> Total inference time: 355.6783 seconds