Robbyant, the embodied AI unit inside Ant Group, has open sourced LingBot-World, a big scale world mannequin that turns video era into an interactive simulator for embodied brokers, autonomous driving and video games. The system is designed to render controllable environments with excessive visible constancy, sturdy dynamics and lengthy temporal horizons, whereas staying responsive sufficient for actual time management.
From textual content to video to textual content to world
Most textual content to video fashions generate brief clips that look reasonable however behave like passive motion pictures. They don’t mannequin how actions change the surroundings over time. LingBot-World is constructed as a substitute as an motion conditioned world mannequin. It learns the transition dynamics of a digital world, in order that keyboard and mouse inputs, along with digital camera movement, drive the evolution of future frames.
Formally, the mannequin learns the conditional distribution of future video tokens, given previous frames, language prompts and discrete actions. At coaching time, it predicts sequences as much as about 60 seconds. At inference time, it might probably autoregressively roll out coherent video streams that stretch to round 10 minutes, whereas preserving scene construction steady.
Knowledge engine, from net video to interactive trajectories
A core design in LingBot-World is a unified information engine. It offers wealthy, aligned supervision for the way actions change the world whereas overlaying various actual scenes.
The information acquisition pipeline combines 3 sources:
- Giant scale net movies of people, animals and automobiles, from each first particular person and third particular person views
- Sport information, the place RGB frames are strictly paired with consumer controls equivalent to W, A, S, D and digital camera parameters
- Artificial trajectories rendered in Unreal Engine, the place clear frames, digital camera intrinsics and extrinsics and object layouts are all recognized
After assortment, a profiling stage standardizes this heterogeneous corpus. It filters for decision and length, segments movies into clips and estimates lacking digital camera parameters utilizing geometry and pose fashions. A imaginative and prescient language mannequin scores clips for high quality, movement magnitude and consider sort, then selects a curated subset.
On prime of this, a hierarchical captioning module builds 3 ranges of textual content supervision:
- Narrative captions for entire trajectories, together with digital camera movement
- Scene static captions that describe surroundings structure with out movement
- Dense temporal captions for brief time home windows that target native dynamics
This separation lets the mannequin disentangle static construction from movement patterns, which is essential for lengthy horizon consistency.
Structure, MoE video spine and motion conditioning
LingBot-World begins from Wan2.2, a 14B parameter picture to video diffusion transformer. This spine already captures sturdy open area video priors. Robbyant group extends it into a mix of specialists DiT, with 2 specialists. Every knowledgeable has about 14B parameters, so the overall parameter depend is 28B, however only one knowledgeable is lively at every denoising step. This retains inference price just like a dense 14B mannequin whereas increasing capability.
A curriculum extends coaching sequences from 5 seconds to 60 seconds. The schedule will increase the proportion of excessive noise timesteps, which stabilizes international layouts over lengthy contexts and reduces mode collapse for lengthy rollouts.
To make the mannequin interactive, actions are injected instantly into the transformer blocks. Digital camera rotations are encoded with Plücker embeddings. Keyboard actions are represented as multi scorching vectors over keys equivalent to W, A, S, D. These encodings are fused and handed by means of adaptive layer normalization modules, which modulate hidden states within the DiT. Solely the motion adapter layers are positive tuned, the primary video spine stays frozen, so the mannequin retains visible high quality from pre coaching whereas studying motion responsiveness from a smaller interactive dataset.
Coaching makes use of each picture to video and video to video continuation duties. Given a single picture, the mannequin can synthesize future frames. Given a partial clip, it might probably prolong the sequence. This ends in an inside transition operate that may begin from arbitrary time factors.
LingBot World Quick, distillation for actual time use
The mid-trained mannequin, LingBot-World Base, nonetheless depends on multi step diffusion and full temporal consideration, that are costly for actual time interplay. Robbyant group introduces LingBot-World-Quick as an accelerated variant.
The quick mannequin is initialized from the excessive noise knowledgeable and replaces full temporal consideration with block causal consideration. Inside every temporal block, consideration is bidirectional. Throughout blocks, it’s causal. This design helps key worth caching, so the mannequin can stream frames autoregressively with decrease price.
Distillation makes use of a diffusion forcing technique. The coed is skilled on a small set of goal timesteps, together with timestep 0, so it sees each noisy and clear latents. Distribution Matching Distillation is mixed with an adversarial discriminator head. The adversarial loss updates solely the discriminator. The coed community is up to date with the distillation loss, which stabilizes coaching whereas preserving motion following and temporal coherence.
In experiments, LingBot World Quick reaches 16 frames per second when processing 480p movies on a system with 1 GPU node, and, maintains finish to finish interplay latency below 1 second for actual time management.
Emergent reminiscence and lengthy horizon habits
One of the attention-grabbing properties of LingBot-World is emergent reminiscence. The mannequin maintains international consistency with out express 3D representations equivalent to Gaussian splatting. When the digital camera strikes away from a landmark equivalent to Stonehenge and returns after about 60 seconds, the construction reappears with constant geometry. When a automotive leaves the body and later reenters, it seems at a bodily believable location, not frozen or reset.
The mannequin also can maintain extremely lengthy sequences. The analysis group exhibits coherent video era that extends as much as 10 minutes, with steady structure and narrative construction.]
VBench outcomes and comparability to different world fashions
For quantitative analysis, the analysis group used VBench on a curated set of 100 generated movies, every longer than 30 seconds. LingBot-World is in comparison with 2 current world fashions, Yume-1.5 and HY-World-1.5.
On VBench, LingBot World reviews:
These scores are greater than each baselines for imaging high quality, aesthetic high quality and dynamic diploma. The dynamic diploma margin is giant, 0.8857 in comparison with 0.7612 and 0.7217, which signifies richer scene transitions and extra complicated movement that reply to consumer inputs. Movement smoothness and temporal flicker are akin to the very best baseline, and the tactic achieves the very best total consistency metric among the many 3 fashions.
A separate comparability with different interactive methods equivalent to Matrix-Sport-2.0, Mirage-2 and Genie-3 highlights that LingBot-World is likely one of the few absolutely open sourced world fashions that mixes common area protection, lengthy era horizon, excessive dynamic diploma, 720p decision and actual time capabilities.
Purposes, promptable worlds, brokers and 3D reconstruction
Past video synthesis, LingBot-World is positioned as a testbed for embodied AI. The mannequin helps promptable world occasions, the place textual content directions change climate, lighting, fashion or inject native occasions equivalent to fireworks or transferring animals over time, whereas preserving spatial construction.
It may well additionally prepare downstream motion brokers, for instance with a small imaginative and prescient language motion mannequin like Qwen3-VL-2B predicting management insurance policies from photographs. As a result of the generated video streams are geometrically constant, they can be utilized as enter to 3D reconstruction pipelines, which produce steady level clouds for indoor, outside and artificial scenes.
Key Takeaways
- LingBot-World is an motion conditioned world mannequin that extends textual content to video into textual content to world simulation, the place keyboard actions and digital camera movement instantly management lengthy horizon video rollouts as much as round 10 minutes.
- The system is skilled on a unified information engine that mixes net movies, sport logs with motion labels and Unreal Engine trajectories, plus hierarchical narrative, static scene and dense temporal captions to separate structure from movement.
- The core spine is a 28B parameter combination of specialists diffusion transformer, constructed from Wan2.2, with 2 specialists of 14B every, and motion adapters which might be positive tuned whereas the visible spine stays frozen.
- LingBot-World-Quick is a distilled variant that makes use of block causal consideration, diffusion forcing and distribution matching distillation to attain about 16 frames per second at 480p on 1 GPU node, with reported finish to finish latency below 1 second for interactive use.
- On VBench with 100 generated movies longer than 30 seconds, LingBot-World reviews the best imaging high quality, aesthetic high quality and dynamic diploma amongst Yume-1.5 and HY-World-1.5, and the mannequin exhibits emergent reminiscence and steady lengthy vary construction appropriate for embodied brokers and 3D reconstruction.
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