Vikas Chandra

Senior Director of #AI Research @Meta | CMU Ph.D. | Ex visiting faculty at Stanford

[Vikas Chandra @vikasc]

Vision Language Models are native 3D learners!

[Zhipeng Cai @cai_zhipeng]

🎇Thrilled to release VLM^3! Most 3D vision papers nowadays still spend months/years designing complex archs/losses/augmentations for different tasks. Are they necessary? VLM^3 shows that most designs that you think are important for 3D vision are [not] important at all!

[Vikas Chandra @vikasc]

We just released MobileMoE, first sub-B-active-parameter MoE language model family.

MoE isn't just for 100B+ parameter models on servers. At sub-B scale, sparse expert routing lets you match dense models at 2-4x fewer FLOPs while fitting in mobile DRAM.

https://t.co/ZvwJBVs778

[Kelly Greer @kellyjgreer]

2/ the work by @vikasc and others at Meta AI shows that Trajectory Reduction Policy Optimization (dTPRO) significantly reduces the training cost of diffusion LLMs (dLLMs), a key step forward as scaled training has been a hurdle for dLLM to date. watch out for what comes from Meta here
https://t.co/l1GjjhmM3C

[Vikas Chandra @vikasc]

Grateful to @sallywf and @EETimes for the thoughtful writeup of my Embedded Vision Summit keynote. The thesis in one line: the next decade of AI won't be won by the biggest model, but by the smartest, most efficient one that lives on the devices you wear!

https://t.co/JBKwfRI6jZ

[Vikas Chandra @vikasc]

Audio is the most ignored perception modality in on-device AI.

Every smart glass, robot, and drone has a mic. Almost none fuse audio + vision at perception time.

Vision-only is the vibe-coded version of multimodal perception.

[Kelly Greer @kellyjgreer]

the market loves to talk hardware because stock prices go brrr but

the most interesting thing happening right now is in alternative model architectures

[Vikas Chandra @vikasc]

3/ Even Qwen2.5 Omni hits just 27.3% on foreground and 39.5% on background sound accuracy. Audio hallucination is widespread in today's AV-LLMs, and robust evaluation has to be a first-class metric for AR/wearable use cases.

📄 https://t.co/KrAKvZOGHA

[Vikas Chandra @vikasc]

1/ New @ieeeICASSP 2026 (Oral): "Exploring Audio Hallucination in Egocentric Video Understanding."

Audio-visual LLMs often "hear" things they didn't, inferring sounds from visual cues alone. We built a benchmark to quantify it.

[Vikas Chandra @vikasc]

2/ Setup: 300 egocentric videos, 1,000 sound-focused Q/As, with a taxonomy that separates foreground action sounds (from the user's activity) and background ambient sounds.

[Vikas Chandra @vikasc]

@MingchenZhuge @AilingZeng81332 @tikgiau @shirleyrz_ @sherryyangML @sthuyan @_yunzhong @SchmidhuberAI @Wenyi_AI_Wang @dmitrii_tech @PiotrPiekosAI Thanks @MingchenZhuge for all your hard work in both organizing and running this awesome workshop!

[Vikas Chandra @vikasc]

Long post pulling the field together, leaning on my group's work (EUPE, EfficientSAM, Efficient Track Anything, EdgeTAM, LongVU, EgoAVU, VideoAuto-R1, DepthLM, ParetoQ) placed against the parallel work in each section.

https://t.co/hg2gsiATke

[Vikas Chandra @vikasc]

Efficient Video Intelligence in 2026 🧵

Five years ago video understanding meant action recognition on Kinetics-400. Now VLMs reason over hour-long footage, foundation-grade tracking runs at 16 FPS on a phone, and one sub-100M backbone replaces four specialized encoders.

[Vikas Chandra @vikasc]

What's still hard is mostly deployment: streaming at hour-plus durations, sub-watt AR glasses, open-set anomaly detection, cross-camera reasoning, spatial grounding through cuts, closed-loop eval.

The bottleneck moved from models to the stack around them.

[Vikas Chandra @vikasc]

Diffusion models couldn't reason because RL was too expensive, not because the architecture was wrong. dTRPO collapses trajectory computation to one forward pass. On a 7B model: +9.6% GPQA, +4.3% HumanEval+. The architecture question is open again.

Paper: https://t.co/lOYHzWu2ck

[Vikas Chandra @vikasc]

Standard approach to long video: more frames, bigger context. Tempo flips it. A small VLM reads the question first, then compresses the video around it. 6B params. 8K visual tokens. Outperforms GPT-4o and Gemini 1.5 Pro on hour-long videos. https://t.co/RSU3e81yJb

[AVB @neural_avb]

Been thinking about what this paper really means.

"Video diffusion" and "World Models" are becoming synonymous. Neural Computers are basically video diffusion world models for terminal envs and GUI.

Lots of talk last week about automating Manim videos. In theory, we should be able to train these world models on a 10000 hours of diverse manim videos and "see where it goes"

If a NC can generate outputs to terminal commands, it should be able to generate videos like this directly from prompt too.

Without writing code.

[Vikas Chandra @vikasc]

Classical computers run programs. Agents wrap models around programs. Neural Computers ask: what if the model is the program, the memory, and the machine? New paper exploring fully learned runtimes where computation emerges from weights alone.

Paper: https://t.co/6s7JvVD6YQ

[Kelly Greer @kellyjgreer]

the market is reacting to the memory shortage by buying Sandisk assuming that labs continue to run less optimized versions of their own models and overspend on hardware but the longer term signal to take from the memory wall is to focus on the continued scaling down of models

deployed compute has scaled 3x every 2 years while memory bandwidth has only scaled 1.6x over 20 years - every new GPU generation widens this gap - but we've also been grossly overusing memory via the common training mode. APOLLO showed that AdamW, the standard LLM optimizer, stores redundant state for every single parameter, and that coarser gradient approximations achieve the same training quality with a fraction of the memory, enabling model pre-training on a 1/8 the GPU capacity. many more proof points are coming to light re: optimizing algorithms and efficiency of smaller models. in fact small models can outperform much larger models by spending more compute at inference time

good read on this from @vikasc

[Jürgen Schmidhuber @SchmidhuberAI]

Neural Computers
https://t.co/XVk9bCLGbm