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Justin Johnson
394 posts
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Justin Johnson
@jcjohnss
Cofounder @theworldlabs. Building Spatial Intelligence.
Joined January 2014
615
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  • Pinned
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    Justin Johnson
    @jcjohnss
    Nov 12, 2025
    Today we are launching Marble โ€“ a multimodal world model that lets you create and edit 3D worlds.
    user avatar
    World Labs
    @theworldlabs
    Nov 12, 2025
    Introducing Marble by World Labs: a foundation for a spatially intelligent future. Create your world at marble.worldlabs.ai
    00:00
    15K
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    Justin Johnson
    @jcjohnss
    Aug 10, 2020
    Videos for my Fall 2019 course "Deep Learning for Computer Vision" are now on YouTube! This is an evolution of @cs231n that I used to teach at Stanford: - All content refreshed - New topics: Transformers, Video, 3D, etc - HW in @PyTorch + @GoogleColab
    youtube.com
    Deep Learning for Computer Vision
    Computer Vision has become ubiquitous in our society, with applications in search, image understanding, apps, mapping, medicine, drones, and self-driving car...
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    Justin Johnson
    @jcjohnss
    Apr 5, 2023
    I'm excited about Segment Anything released from FAIR today. It tackles an old problem (find objects in images) at large scale: trained on 11M images and 1B objects. This is a new Foundation Model for Computer Vision - it recognizes any object in any context.
    GIF
    576K
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    Justin Johnson
    @jcjohnss
    Sep 5, 2025
    10 years ago, deep learning was in its infancy. PyTorch didn't exist. Language models were recurrent, and not large. But it felt important: a new technology that would change everything. That's why @drfeifei , @karpathy, and I started @cs231n back in 2015 - to teach the world's
    youtube.com
    Stanford CS231N Deep Learning for Computer Vision I 2025
    Computer Vision has become ubiquitous in our society, with applications in search, image understanding, apps, mapping, medicine, drones, and self-driving car...
    162K
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    Justin Johnson
    @jcjohnss
    Apr 6, 2018
    My new paper on generating images from scene graphs using graph convolution and GANs is up on arXiv! To appear at CVPR2018, with @agrimgupta92 and @drfeifei arxiv.org/abs/1804.01622
  • user avatar
    Justin Johnson
    @jcjohnss
    Jun 12, 2020
    Our new paper (w/@kdexd) argues that "language is all you need" for good visual features: we train CNN+Transformer *from scratch* on ~100k images+captions from COCO, transfer the CNN to 6 downstream vision tasks, and match/exceed ImageNet features despite using 10x fewer images!
    user avatar
    Karan Desai (KD)
    @kdexd
    Jun 12, 2020
    Introducing "VirTex": a pretraining approach to learn visual features via language using fewer images. Pretrain: CNN+Transformer from scratch on COCO Captions. Transfer CNN: Results on 6 vision tasks match/exceed ImageNet pretraining (10x size wrt COCO)! arxiv.org/abs/2006.06666
  • user avatar
    Justin Johnson
    @jcjohnss
    Apr 28, 2020
    Today we released PyTorch3D v0.2, adding new features around point clouds: - Point cloud renderer - Point-to-mesh distances - Normal estimation - Umeyama, ICP, PnP, and KNN All batched and differentiable, ready to drop into your deep learning models!
    Release v0.2.0 ยท facebookresearch/pytorch3d
    From github.com
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    Justin Johnson
    @jcjohnss
    Mar 25, 2020
    Today we released code for SynSin, our CVPR'20 oral that generates novel views from a single image: github.com/facebookresearโ€ฆ We have: - Pretrained models - Jupyter notebook demos - Training and evaluation - #pytorch3d integration Congrats to @oliviawiles1 on the release!
    GIF
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    Justin Johnson
    @jcjohnss
    Jun 14, 2018
    I successfully defended my PhD today! Huge thanks to @drfeifei for being an amazing mentor on this journey!
    user avatar
    Fei-Fei Li
    @drfeifei
    Jun 13, 2018
    Super proud of my PhD student Justin @jcjohnss for successfully defending his PhD dissertation today. Justinโ€™s thesis symbolizes a new era of computer vision and #AI research moving towards deeper visual reasoning and intelligence. Congrats Justin!!
  • user avatar
    Justin Johnson
    @jcjohnss
    Oct 29, 2019
    This week we open-sourced pycls, a flexible research framework for image classification with @PyTorch encapsulating current best practices. Used internally for research @FacebookAI -- excited to share with the community! Led by Ilija Radosavovic @ir413
    GitHub - facebookresearch/pycls: Codebase for Image Classification Research, written in PyTorch.
    From github.com
  • user avatar
    Justin Johnson
    @jcjohnss
    Aug 11, 2017
    Lecture videos for Stanford CS 231n 2017 are now available! Taught by me, @syeung10, and @drfeifei:
    youtube.com
    Lecture Collection | Convolutional Neural Networks for Visual Recognition (Spring 2017)
    Computer Vision has become ubiquitous in our society, with applications in search, image understanding, apps, mapping, medicine, drones, and self-driving car...
  • user avatar
    Justin Johnson
    @jcjohnss
    Feb 6, 2020
    PyTorch3D is our new library for accelerating 3D deep learning research, and provides: - Easy batching of heterogeneous triangle meshes - Optimized implementations of common mesh ops - Modular, efficient, differentiable mesh renderer - More to come!
    user avatar
    AI at Meta
    Meta
    @AIatMeta
    Feb 6, 2020
    We just released PyTorch3D, a new toolkit for researchers and engineers thatโ€™s fast and modular for 3D deep learning research: ai.facebook.com/blog/-introducโ€ฆ
    00:00
    GitHub - facebookresearch/pytorch3d: PyTorch3D is FAIR's library of reusable components for deep...
    From github.com
  • user avatar
    Justin Johnson
    @jcjohnss
    Jul 3, 2017
    Project reports for #cs231n 2017 are now online! 250+ amazing applications of deep learning: cs231n.stanford.edu/reports.html
  • user avatar
    Justin Johnson
    @jcjohnss
    Jun 7, 2019
    I'm excited to share our new paper that jointly detects objects and predicts 3D triangle meshes in real-world images, called Mesh R-CNN. With Georgia Gkioxari and Jitendra Malik arxiv.org/abs/1906.02739

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