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Sugandha Sharma Profile
Sugandha Sharma

@sugsharma

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GenAI @NVIDIA . Prev: Research Scientist @Microsoft Research (GPT based gaming AI & alignment) | PhD @MIT @mitbrainandcog @FieteGroup @MITCoCoSci

Cambridge, MA
Joined May 2015
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@sugsharma
Sugandha Sharma
2 months
✨Officially received my Doctorate degree from MIT today!✨ Extremely grateful to everyone who made this possible 🙏 Big thanks to both of my advisors, committee members, mentors, colleagues, friends and family. This wouldn’t have been possible without each & every one of you.
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@sugsharma
Sugandha Sharma
2 months
Celebrating the completion of my PhD @MIT BCS Stole Bestowal Ceremony today with my PhD advisor, Josh Tenenbaum. Grateful for his guidance and support! @mitbrainandcog @MITCoCoSci
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@sugsharma
Sugandha Sharma
2 years
We had a paper in ICLR! The title is: "Map Induction: Compositional Spatial Submap Learning for Efficient Exploration in Novel Environments". We propose the Map Induction hypothesis, empirically test it through human behavior, and formalize it through a computational model (1/n)
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@sugsharma
Sugandha Sharma
3 months
Finally a tweeprint on our recent preprint presenting Vector-HaSH ! Vector-HaSH extends MESH to unify two important and seemingly independent roles of hippocampus: Spatial Mapping and Episodic Memory ! Brief talk: Preprint: 1/n
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@sugsharma
Sugandha Sharma
3 months
Enjoyed the @NVIDIA - @MIT lunch meetup today w/ @DrJimFan ! I was representing both sides for the first time today🙂. Great reconnecting w/ these wonderful colleagues at MIT too! @BoyuanChen0 , @ZhutianYang_ , @avivnet @NishanthJKumar1 , @hyojinbahng , @haoshu_fang , @TheAndiPenguin
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@sugsharma
Sugandha Sharma
2 months
Celebrating with @vin_agarwal at the @MIT BCS Stole Bestowal Ceremony. Grateful to him for his unwavering support throughout my PhD! @mitbrainandcog
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@sugsharma
Sugandha Sharma
2 months
Thank you all for your kind wishes on my graduation!🎓 I am deeply grateful for the overwhelming support 🙏 Heartfelt gratitude to each one of you. Some people have asked about my PhD thesis — here's a link to my PhD defense talk for those interested ✨
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@sugsharma
Sugandha Sharma
4 months
Thanks @doristsao for your kind & thoughtful words about our work! I am glad that you find it beautiful, creative and conceptually insightful! For folks who would like to know more: Short talk on Vector-HaSH Short talk on MESH
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@doristsao
Doris Tsao
4 months
@SebastianSeung Btw, I don't know if @FieteGroup is funded by BRAIN, but their recent work understanding grid cell-place cell dynamics as a general mechanism for episodic memory that factorizes problem of building attractors from problem of assigning content to them, is such a beautiful and
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@sugsharma
Sugandha Sharma
4 months
Thank you so much @SebastianSeung for appreciating our work! I am glad to hear that you consider it a breakthrough in theoretical neuroscience! For folks who would like to know more: Short talk on Vector HaSH Short talk on MESH
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@SebastianSeung
Sebastian Seung
4 months
@doristsao @FieteGroup +1 to an amazing conceptual breakthrough in theoretical neuroscience that I think did not depend on big data or fancy technologies. What we can say is that BRAIN technologies will make the theory testable in a much more conclusive way than was ever possible.
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@sugsharma
Sugandha Sharma
1 year
Presenting poster II-122 @ #cosyne2023 today! First model of hippocampal-entorhinal cortex that encapsulates key findings of entorhinal map plasticity: grid map fragmentation, interpolation at short timescales (local consistency), map merger at long timescales (global consistency)
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@sugsharma
Sugandha Sharma
10 months
Great line of work by @criticalneuro & colleagues showing that despite knowing the connectivity structure of a spatial map (or graph), LLMs fail to report the shortest path between two rooms (nodes). They hallucinate edges that don't exist, report longer paths, & fall into loops.
@criticalneuro
Ida Momennejad
10 months
Delighted to share our #neurips2023 paper w @grockious @hmd_palangi et al Evaluating Cognitive Maps & Planning in LLMs with CogEval We test planning in 8 LLMs. Failures like hallucinating invalid paths/falling in loops don't support emergent planning. 1/n
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@sugsharma
Sugandha Sharma
2 years
We have a paper in ICML! Title: "Content Addressable Memory Without Catastrophic Forgetting by Heteroassociation with a Fixed Scaffold". We propose a novel CAM (content addressable memory) architecture that generates a CAM continuum without a memory cliff. (1/n) #ICML #ICML2022
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@sugsharma
Sugandha Sharma
2 years
Huge congrats to Prof. Ila Fiete for being awarded the Swartz Prize for Theoretical and Computational Neuroscience!! So fortunate and grateful to be working with her!
@FieteGroup
FieteGroup
2 years
Thanks to the Swartz foundation @SwartzCompNeuro , the SfN Swartz prize committee and the SfN @SfNtweets ! Touched to hear from so many brilliant female computational neuroscientists. For the young women and men in computational neuroscience — this is you next. (1/5)
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@sugsharma
Sugandha Sharma
5 months
Thank you @mcgovernmit , @pmcgovern and @mitbrainandcog for all the support through the years!!! Thanks to my family featured in this photo: @vin_agarwal for always being by my side, and especially @sharmadhruv71 , Shivam and Soumya for coming all the way from Canada to attend!
@mcgovernmit
McGovern Institute
5 months
Congrats to @sugsharma on her successful PhD thesis defense! Well done, Dr Sharma - we are all so proud of you!! @FieteGroup
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@sugsharma
Sugandha Sharma
2 years
Excited to announce that our paper "Content addressable memory without catastrophic forgetting by heteroassociation with a fixed scaffold" got accepted at #ICML Arxiv version of the paper: Stay tuned for the final camera ready version!
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@sugsharma
Sugandha Sharma
2 years
Had a wonderful time presenting alongside @behrenstimb , @dileeplearning , @lengyel_m , Dora Angelaki, Ilker Yildirim; Irinia Higgins and Ishita Dasgupta from @DeepMind in the #cosyne2022 workshop. Grateful for all the encouragement and insights from these amazing scientists!
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@sugsharma
Sugandha Sharma
3 months
Great work on mapping a small part of the human cortex! Congratulations to the researchers in connectomics team @GoogleAI and @Harvard !
@GoogleAI
Google AI
3 months
Michał Januszewski is a Staff Research Scientist at Google Research who’s decoding the secrets of how we think. Explore how the Google Research Connectomics team developed AI to create detailed brain maps similar to electrical wiring diagrams. →
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@sugsharma
Sugandha Sharma
2 years
If you are at #cosyne2022 , stop by my poster III-058 today to learn about Map Induction: Composition of spatial regions for efficient exploration in novel environments. #COSYNE22
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@sugsharma
Sugandha Sharma
4 months
Flocking behavior in birds is fascinating! In work @MSFTResearch (), I found that humans playing an Xbox game showed flocking (without explicit instruction or reward for it), while GPT based AI agents played solo. Next: AI that utilizes social information.
@wonderofscience
Wonder of Science
4 months
The incredible coordination of a spectacular bird behavior known as murmuration.
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@sugsharma
Sugandha Sharma
2 years
What a creative holiday greeting from @mcgovernmit ! Glad to have been a part of it for representing Hindi :)
@mcgovernmit
McGovern Institute
2 years
What's better than a holiday greeting from the McGovern Institute? How about a holiday greeting in 30 different languages (including Klingon!) from researchers across our labs. You don't want to miss this one - turn up the volume!
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@sugsharma
Sugandha Sharma
3 years
Just finished three years of the Computational and Theoretical Neuroscience journal club today! Big thanks to Ila Fiete @FieteGroup for being the driving force for its inauguration in fall 2018, and @ScienceMIT for funding us through Science Quality of Life (SQoL) program. (1/n)
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@sugsharma
Sugandha Sharma
3 months
Congratulations to @maxjaderberg & team for their amazing work on AlphaFold 3 ! Great collaboration b/w @GoogleDeepMind and @IsomorphicLabs !
@maxjaderberg
Max Jaderberg
3 months
Super excited to be releasing AlphaFold 3 today, developed by @IsomorphicLabs and @GoogleDeepMind : our next generation AI model for predicting the biomolecular structures and interactions of proteins, DNA, RNA, small molecules, and more: 1/
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@sugsharma
Sugandha Sharma
3 months
SceneDiffusion optimizes a layered scene representation (during diffusion sampling) to obtain spatial disentanglement by jointly denoising scene renderings at different spatial layouts. This disentangles spatial info & appearance allowing spatial editing! Thanks @liuziwei7 &team.
@liuziwei7
Ziwei Liu
3 months
😼Move Anything in Your Picture😼 #CVPR2024 We propose 🏞️SceneDiffusion🏞️ to freely rearrange image layouts by layered scene diffusion @CVPR * It supports a wide range of spatial editing operations, e.g., moving, resizing and layer-wise editing - Paper:
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@sugsharma
Sugandha Sharma
3 months
An important aspect of embodied AI is to enable effective navigation of 3D spaces. In this brief talk I present a Generative AI agent that efficiently explores partially observed novel spatial environments through map generation 🏘️🏣🏙️🏦.
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@sugsharma
Sugandha Sharma
2 years
I was recently invited as a guest for an AI podcast and had an exciting and fun conversation with @kanjun and @joshalbrecht , the CEO and CTO @genintelligent . Today I received this lovely gift and a very kind thank you note from them! Thank you so much @kanjun and @joshalbrecht !
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@sugsharma
Sugandha Sharma
2 years
Recently got invited to present the MESH model at @GuangyuRobert 's lab and at @TomasoPoggio 's lab (thanks to @akshayrangamani for inviting!) It was fun discussing memory with scientists/theorists in both labs, and am grateful for all the intriguing questions & fun conversations!
@sugsharma
Sugandha Sharma
2 years
We have a paper in ICML! Title: "Content Addressable Memory Without Catastrophic Forgetting by Heteroassociation with a Fixed Scaffold". We propose a novel CAM (content addressable memory) architecture that generates a CAM continuum without a memory cliff. (1/n) #ICML #ICML2022
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@sugsharma
Sugandha Sharma
2 months
@mitbrainandcog Stole Bestowal Ceremony with Julianne Gale Ormerod and Sierra Vallin. Thanks to both of them for their tremendous efforts towards supporting and enriching my experience as a graduate student in the BCS PhD program throughout my time @MIT . Forever grateful to them!
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@sugsharma
Sugandha Sharma
4 months
I have always thought that philosophy and the study of the brain go hand in hand, and this beautiful piece of writing by @criticalneuro reinforces that thought ! It highlights how important memory is “To remember is to be”. More power to everyone studying memory !
@criticalneuro
Ida Momennejad
4 months
I've studied memory for 15 years with an empirical lens, scanned it, modeled it. "The logic of memory" is my philosophical musing on memory, what I found missing in scientific discourse. Thanks to @Philosoph_Salon & @esdsantos 's course on James Baldwin🙏🏼
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@sugsharma
Sugandha Sharma
2 years
Had a great time presenting our MESH model at ICML 2022 ! Checkout the spotlight talk here: Full Paper: Checkout the following twitter thread for a quick summary: Big thanks to the ICML organizers !
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@sugsharma
Sugandha Sharma
2 years
We have a paper in ICML! Title: "Content Addressable Memory Without Catastrophic Forgetting by Heteroassociation with a Fixed Scaffold". We propose a novel CAM (content addressable memory) architecture that generates a CAM continuum without a memory cliff. (1/n) #ICML #ICML2022
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@sugsharma
Sugandha Sharma
2 years
I will be presenting our work on Map Induction @ #CogSci2022 in the poster session tomorrow from 8:30-10:30am. Drop by if you would like to chat! Here's a short 5 min talk if you want a trailer:
@sugsharma
Sugandha Sharma
2 years
2) The Map Induction based MAP-POMCP model that explores efficiently by inducing the map based on observed regions of the environment. The illustration shows the most likely map. Note that the induced map is updated dynamically in an online way based on new observations!
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@sugsharma
Sugandha Sharma
2 years
Folks at #cosyne2022 #COSYNE22 come check out our poster I-140 to learn about building a content addressable memory model that escapes catastrophic forgetting through a combination of a pre-defined memory scaffold and heteroassociation of dense arbitrary patterns.
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@sugsharma
Sugandha Sharma
3 months
Watch PhysDreamer synthesize action-conditioned 3D object dynamics in response to interactions. This requires perception of the physical material properties of objects. PhysDreamer takes a physics-based approach, leverages object dynamics priors learned by video generation models
@tianyuanzhang99
Tianyuan Zhang
3 months
3D Gaussian is great, but how can you interact with it 🌹👋? Introducing #PhysDreamer : Create your own realistic interactive 3D assets from only static images! Discover how we do this below👇 🧵1/: Website:
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@sugsharma
Sugandha Sharma
2 years
2) The Map Induction based MAP-POMCP model that explores efficiently by inducing the map based on observed regions of the environment. The illustration shows the most likely map. Note that the induced map is updated dynamically in an online way based on new observations!
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@sugsharma
Sugandha Sharma
3 years
Excited for the K. Lisa Yang Integrative Computational Neuroscience #ICoN center @mcgovernmit which will create advanced mathematical models and computational tools to advance our understanding of the brain. Honored to be a part this amazing initiative!
@mcgovernmit
McGovern Institute
3 years
The #ICoN center will also provide four graduate fellowships to @MIT students each year in perpetuity. This year’s inaugural grad fellows include Mark Saddler from @JoshHMcDermott lab and @sugsharma from the Tenenbaum and Fiete labs. 🧵 4/5
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@sugsharma
Sugandha Sharma
2 years
Just registered for #COSYNE2022 Here are my submissions that we will be presenting @CosyneMeeting this year. Got questions? Lets chat more in Lisbon!
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@sugsharma
Sugandha Sharma
2 years
The Great Picower Baking Show! Hosted by the Tsai lab @MIT_Picower @mitbrainandcog . What a wonderful effort to bring people together!
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@sugsharma
Sugandha Sharma
3 years
Human perception of correlated motion of lines as a moving cube shown in the light show in #Boston on new years eve. Reminded me of the cool illusions and perceptual effects shown by @vin_agarwal in @MIT 's Splash2021 organized by @espmit . Group photo of our group of teachers!
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@sugsharma
Sugandha Sharma
2 years
Map Induction hypothesis – that humans optimize exploration of new spaces by representing maps as composed of reusable reference frames – which can inferred by program induction to represent unseen space as composed of previously encountered regions. (2/n)
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@sugsharma
Sugandha Sharma
2 years
How to build a memory model that can continuously tradeoff number of stored patterns and pattern richness? Come to our poster at #ICML2022 to get some answers! Paper: Slides: Check the following twitter thread for a quick summary
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@sugsharma
Sugandha Sharma
2 years
We have a paper in ICML! Title: "Content Addressable Memory Without Catastrophic Forgetting by Heteroassociation with a Fixed Scaffold". We propose a novel CAM (content addressable memory) architecture that generates a CAM continuum without a memory cliff. (1/n) #ICML #ICML2022
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@sugsharma
Sugandha Sharma
2 years
Want to learn about a content addressable memory model that doesn't show catastrophic forgetting, but instead exhibits the desired memory continuum? Will be giving a talk on it @cshlmeetings today in the afternoon session. #cshlNeuroAI Full paper:
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@sugsharma
Sugandha Sharma
2 years
Interested in a memory model that gradually forgets similar to humans? Come to our Spotlight talk (4:15-5:45pm session) @ #ICML2022 & come chat in the poster session today ! "Content Addressable Memory Without Catastrophic Forgetting by Heteroassociation with a Fixed Scaffold"
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@sugsharma
Sugandha Sharma
3 months
Vector-HaSH is the first Entorhinal-Hippocampal model to unify item, spatial & episodic memory. It uses the representational structure used in spatial mapping, to generate high-capacity episodic memory. Multiple experimentally observed hippocampal phenomenon emerge in it. 15/n
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@sugsharma
Sugandha Sharma
3 months
Really cool work combining inverse physics with inverse rendering. Finally a step towards enabling virtual garment fitting ! - an important use-case I have long thought about 😄.
@qingqing_zhao_
Qingqing Zhao
4 months
How do we create realistic models of dressed humans directly from visual data? We introduce PhysAvatar, a framework that estimates the shape, appearance, and physical parameters of dressed human avatars from multi-view videos. Page: (1/6)
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@sugsharma
Sugandha Sharma
2 years
Thus, humans build a distribution of possible maps through an inductive process after seeing a partial piece of the environment. This Map Induction process is a conceptually new way to think about how humans navigate through the world in few- and zero-shot settings.  (10/n)
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@sugsharma
Sugandha Sharma
3 months
Pretty neat writeup on llama3 by @karpathy covering key aspects of the model! Super useful!
@karpathy
Andrej Karpathy
3 months
Congrats to @AIatMeta on Llama 3 release!! 🎉 Notes: Releasing 8B and 70B (both base and finetuned) models, strong-performing in their model class (but we'll see when the rankings come in @ @lmsysorg :)) 400B is still training, but already encroaching
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@sugsharma
Sugandha Sharma
2 years
Can AI be programed to absorb inspiration, crave communication & hence creative expression? What about the active role between the piece of art and the viewer? For instance, The Tree of Life below by Gustav Klimt has been interpreted in multiple ways! #ai #aiart #aiartcommunity
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@sugsharma
Sugandha Sharma
2 years
Workshop was on "Linking phenomena across levels of analysis: The need for a new multi-level reverse-engineering toolkit". We had a great panel discussion at the end with active participation from the audience which was so much fun!! Many thanks for all their questions/comments!
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@sugsharma
Sugandha Sharma
10 months
Excited to be on the program committee of the AMHN workshop on Associative Memories @NeurIPSConf ! I have been working on an associative memory model of hippocampal episodic memory enabled by pre-structured spatial representations with Ila Fiete. Excited to share & see new ideas!
@p_ram_p
Parikshit Ram
10 months
Excited to share the schedule for our @NeurIPSConf AMHN workshop at #NeurIPS2023 : Please consider submitting your latest & greatest (new work, NeurIPS, AAAI, ICLR, etc): CfP Deadline Oct 6 (AoE) Submissions
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@sugsharma
Sugandha Sharma
4 months
@mcgovernmit recently shed light on mindfulness research @mitbrainandcog . Shout out to @isaac_treves @CindyLi75708399 @olaozpa @HalieOlson @lstigkeit @gabrieli_john @MITBrainStudy for their amazing work! I gave a high level outreach talk on your work! 1/3
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@mcgovernmit
McGovern Institute
7 months
These findings contribute to a growing body of evidence that mindfulness can change patterns of brain activity associated with emotions and mental health.
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@sugsharma
Sugandha Sharma
3 months
Spatial Memory: as the agent moves around, velocity inputs update the grid state, & landmark sensory inputs get associated with particular grid codes, i.e., particular locations in space. Allows bidirectional inference in familiar & zero-shot inference in novel environments. 8/n
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@sugsharma
Sugandha Sharma
3 months
I am deeply grateful to @SebastianSeung for recognizing this work and for his kind and encouraging words in his recent tweet 🙏🙏.
@SebastianSeung
Sebastian Seung
4 months
@doristsao @FieteGroup +1 to an amazing conceptual breakthrough in theoretical neuroscience that I think did not depend on big data or fancy technologies. What we can say is that BRAIN technologies will make the theory testable in a much more conclusive way than was ever possible.
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@sugsharma
Sugandha Sharma
3 months
RAG is being widely used to circumvent the problem of hallucinations in LLMs emphasizing the need for efficient external memory storage & retrieval systems like MESH. This talk summarizes key aspects of MESH - a neural memory model inspired by neuroscience
@sugsharma
Sugandha Sharma
2 years
We have a paper in ICML! Title: "Content Addressable Memory Without Catastrophic Forgetting by Heteroassociation with a Fixed Scaffold". We propose a novel CAM (content addressable memory) architecture that generates a CAM continuum without a memory cliff. (1/n) #ICML #ICML2022
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@sugsharma
Sugandha Sharma
2 years
We formalize the map induction hypothesis to quantitatively test its predictions. We model it by using a Bayesian generative framework consisting of four computational modules that can each be independent of the others and can express different modeling assumptions. (4/n)
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@sugsharma
Sugandha Sharma
3 months
The same core architecture in Vector-HaSH enables three kinds of high-capacity memory: recall of random items, recall of spatial information such as landmarks & their locations, and recall of sequential episodic memory through low-dim vector updates to the grid cell circuit. 7/n
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@sugsharma
Sugandha Sharma
3 months
Vector-HaSH has three core components: grid cells with their modular attractor dynamics; hippocampal cells with sparse continuous activations; and non-grid Entorhinal Cortex (EC) that encodes external sensory observations. 4/n
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@sugsharma
Sugandha Sharma
3 months
MESH factorizes the problem of storing memory into building attractors & assigning content to them, leading to a graceful trade-off b/w pattern number & pattern richness. Brief talk: Paper: Tweeprint: 2/n
@sugsharma
Sugandha Sharma
2 years
We have a paper in ICML! Title: "Content Addressable Memory Without Catastrophic Forgetting by Heteroassociation with a Fixed Scaffold". We propose a novel CAM (content addressable memory) architecture that generates a CAM continuum without a memory cliff. (1/n) #ICML #ICML2022
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@sugsharma
Sugandha Sharma
3 months
Episodic Memory: Vector-HaSH maps the problem of learning arbitrary sequences in a high dim space to simply learning low dim transitions on a sequence scaffold (enabled by low-dim velocity updates to grid cells), which is highly effective for learning sequential information. 9/n
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@sugsharma
Sugandha Sharma
4 months
Come to Cambridge, MIT August 6-9 for CCN this year!
@CogCompNeuro
CogCompNeuro
4 months
📢Submissions for #CCN2024 are now open at ! 📢 We welcome submissions for 2-page papers (deadline: 12 April) and Generative Adversarial Collaborations (GACs), Keynote+Tutorials, and (new this year!) Community Events (deadline: 5 April).
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@sugsharma
Sugandha Sharma
2 years
From Experiment 1, we find that map induction is critical for human like exploration. The Uniform-POMCP model that doesn't use map induction fails to explain human behavior. Quantitatively shown by the Log likelihoods of the three models given human behavioral data. (8/n)
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@sugsharma
Sugandha Sharma
3 months
The Spot robot dog from Boston Dynamics wearing a custom costume and dancing (kind of amusing): Robotics just became even more entertaining 😄
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@sugsharma
Sugandha Sharma
4 months
Haha! Super cool !
@DrJimFan
Jim Fan
4 months
one day PhDs will animate every object around us with reinforcement learning to keep their thesis going
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@sugsharma
Sugandha Sharma
3 months
Following Mosers' eleven rooms, eleven maps exp, Vector-HaSH stores all maps w/ stable reconstruction by storing each room's map in a different region of vast grid coding space, resulting in orthogonalized maps across rooms. Grid cells can be examined within & across rooms. 12/n
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@sugsharma
Sugandha Sharma
2 years
The Region Extractor extracts candidate regions (or submaps) from known parts of the map. The Map Generator generates a space of possible map completions by using an underlying probabilistic generative grammar to combine region primitives into a set of completed maps. (5/n)
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@sugsharma
Sugandha Sharma
3 months
Observations of memory consolidation emerge in Vector-HaSH, consistent with the multiple trace theory of the hippocampus. Frequently seen/recalled memories get strengthened in Vector-HaSH & become more robust to lesions of the hippocampus relative to other stored memories. 14/n
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@sugsharma
Sugandha Sharma
3 months
Last week, @MIT president Sally Kornbluth and @OpenAI CEO Sam Altman @sama engaged in an interesting discussion on MIT campus delving into the "Promise and Perils of AI" Witnessed by MIT students and faculty, here are some highlights on their views:
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@sugsharma
Sugandha Sharma
3 months
Literature review with a visual search! How useful. I always thought "why do we not have a graph-based visual search for papers?". Here it is!
@MushtaqBilalPhD
Mushtaq Bilal, PhD
3 months
If you find a particular paper interesting, Litmaps gives you an option to find more papers like that one. Click on "More like this" under a paper and Litmaps will add new related papers to the map.
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@sugsharma
Sugandha Sharma
2 years
In this work we formalized the Map Induction hypothesis computationally, by combining a Bayesian map induction model and an approximate belief-space planner. We find that Map Induction outperforms the exploration performance of a Partially Observable Monte Carlo Planner. (11/n)
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@sugsharma
Sugandha Sharma
2 years
Paper: Twitter thread with a quick summary: We will be presenting a poster from 6:30-8:30 @ #ICML2022 today. Come chat with us!
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@sugsharma
Sugandha Sharma
2 years
We have a paper in ICML! Title: "Content Addressable Memory Without Catastrophic Forgetting by Heteroassociation with a Fixed Scaffold". We propose a novel CAM (content addressable memory) architecture that generates a CAM continuum without a memory cliff. (1/n) #ICML #ICML2022
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@sugsharma
Sugandha Sharma
3 years
Secret to success "fail as much as you can as quickly as possible"
@BecketEbs
Becket Ebitz
3 years
Freaking thrilled to share that our big @CIHR_IRSC grant just got funded (at the 3rd percentile!?!). Feels like a big accomplishment, especially squeezing this in right at the end of our first year as a lab. Of course, the project also got not-funded 3 times first, so...
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@sugsharma
Sugandha Sharma
3 months
I would like to thank my advisors Ila Fiete and Josh Tenenbaum, my collaborator Sarthak Chandra, and members of @FieteGroup and @MITCoCoSci for their feedback and support. Also thanks to @mitbrainandcog , @mcgovernmit , @MIT for enabling this research 🙏🙏.
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@sugsharma
Sugandha Sharma
3 months
Vector-HaSH extends MESH to build a model of the Entorhinal-Hippocampal system that can store episodic memories through velocity-driven low-dimensional shifts in the Grid cell circuit. K-hot label states in MESH are replaced by the modular & periodic Grid code in Vector-HaSH. 3/n
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@sugsharma
Sugandha Sharma
3 months
Vector-HaSH learns high-capacity seq. scaffolds of arbitrary shapes w/ very small # of cells relative to seq. length (coz it learns lowD velocity updates). Arbitrary sensory sequences are linked to sequence scaffold enabling storage & recall of exponentially long sequences. 10/n
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@sugsharma
Sugandha Sharma
3 months
Key idea: grid+hippocampus forms a pre-structured scaffold with frozen weights; sensory observations in EC are linked to the scaffold via heteroassociation. Analogous to a hippocampal clothesline forming a structured, invariant scaffold onto which external cues are “hooked”. 5/n
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@sugsharma
Sugandha Sharma
3 months
SWE-agent is pretty cool! It uses GPT-4 (or potentially any other LM) to take a GitHub issue and automatically tries to fix it. Best part it’s open source - thanks to the team at Princeton !
@OfirPress
Ofir Press
3 months
Check out my quick demo: Our repo is at:
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@sugsharma
Sugandha Sharma
3 months
Unlike MESH, the scaffold in Vector-HaSH exhibits strong generalization. To learn the scaffold, the scaffold weights need to be trained on only a vanishing fraction of all grid code patterns. Scaffold can be learned once (through early exploration) & then held fixed for life. 6/n
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@sugsharma
Sugandha Sharma
3 months
Vector-HaSH models memory palaces-a mnemonic technique memory athletes use to remember long lists of items-they imagine walking thru a path in a familiar env. & place items on landmarks along the path. Vector-Hash perfectly recalls new items despite degraded landmark recall. 11/n
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@sugsharma
Sugandha Sharma
2 years
We compare human performance to three model hypotheses (variants of POMCP). Uniform-POMCP: doesn’t use map induction Maximum A Posteriori (MAP-POMCP): uses the most likely map from the inferred distribution. Distributional (D-POMPC): uses the entire set of induced maps. (7/n)
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@sugsharma
Sugandha Sharma
3 months
True. Vision would also be a primary input modality for Spatial Navigation - another area thats important for embodied AI. In addition to interacting with 3D objects, embodied agents need to explore & plan in 3D spaces, building generalizable spatial representations as in humans.
@DrJimFan
Jim Fan
3 months
Llama-3 is closing the gap with GPT-4, but multimodal models gotta catch up. Vision capabilities of open models like LlaVA are far, far behind GPT-4V. Video models are even worse. They hallucinate all the time and fail to give detailed descriptions of complex scenes and actions.
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@sugsharma
Sugandha Sharma
3 years
Amazing talks at #cosyne2021 so far! Enjoying looking at others' work and excited to present a poster on my work today at #cosyne2021 from 3-5pm and 7-9pm EST. Drop by if you wanna chat!
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@sugsharma
Sugandha Sharma
3 months
The Debate Over “Understanding” in AI’s Large Language Models. Talk by Melanie Mitchell, Professor at the Santa Fe Institute. She presents arguments that have been made for and against “understanding” in LLMs & discusses potential ways of evaluating it.
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@sugsharma
Sugandha Sharma
2 years
Some cool illustrations showing the qualitative difference between exploration behavior exhibited by: 1) The Uniform-POMCP model that explores exhaustively since it doesn't use any spatial priors. Here: agent (blue), reward (yellow), wall (red), empty space (black).
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@sugsharma
Sugandha Sharma
3 months
Multiple aspects of hippocampal phenomenology emerge in Vector-HaSH including experimental observations on context and direction specific maps: splitter cells, route dependent cells, directional cells, and task dependent cells. 13/n
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@sugsharma
Sugandha Sharma
2 years
Hopfield networks exhibit a memory cliff: addition of a pattern beyond critical capacity leads to catastrophic forgetting (loss) of all patterns. Existing networks each exhibit a memory cliff, & approach the envelope at only one point (a specific number of stored patterns). (6/n)
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@sugsharma
Sugandha Sharma
3 months
I am also truly grateful to @doristsao for her kind and thoughtful comments and a beautiful two line summary of this work in her recent tweet 🙏🙏.
@doristsao
Doris Tsao
4 months
@SebastianSeung Btw, I don't know if @FieteGroup is funded by BRAIN, but their recent work understanding grid cell-place cell dynamics as a general mechanism for episodic memory that factorizes problem of building attractors from problem of assigning content to them, is such a beautiful and
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@sugsharma
Sugandha Sharma
4 months
@_k_a_c_h_ @MarleneBerke @prafull7 Yeap! A dissertation so moving that it moved the earth !
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@sugsharma
Sugandha Sharma
3 months
Pretty impressive that the joint movement is near graceful with full joint rotation. Future of robotics is here !
@BostonDynamics
Boston Dynamics
3 months
We promise this is not a person in a bodysuit.
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@sugsharma
Sugandha Sharma
3 months
Pretty cool work reconstructing the neural circuits that carry visual information to the navigation center of a fruit fly brain. Enables generation of new hypotheses about transformation of visual information at various processing stages for generation of head direction signals!
@SungSoo_111
Sung Soo Kim
8 months
For example, the ring neuron in the video receives information from a vertically elongated visual field. Thus, it may respond to vertical stripes or encode the horizontal location of visual stimulus without elevation information.
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@sugsharma
Sugandha Sharma
3 months
I just did my federal tax return and was thinking about the exact same thing. It would be wonderful to have an LLM assistant who could do my taxes for me every year !
@tejasdkulkarni
Tejas Kulkarni
3 months
Is there an LLM or an agent that can do my taxes? Who is working on this.
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@sugsharma
Sugandha Sharma
4 months
Very useful for those working towards Human-AI alignment!
@MIT_CSAIL
MIT CSAIL
4 months
New MIT CSAIL method automatically breaks LLAMA2-7B, GPT-3.5, Stable Diffusion, and more with curiosity-driven exploration! This type of exploration helps test LLMs & vision models by generating diverse inputs/prompts that trigger unwanted responses from a target model:
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@sugsharma
Sugandha Sharma
2 years
In Experiment 2, we use environments with rewards distributed based on color cues. We find that humans use a distribution of possible maps through map induction. Importantly this is a constrained distribution unlike the distribution in the Uniform model which is large. (9/n)
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@sugsharma
Sugandha Sharma
1 year
This is a great opportunity for anyone interested in cognitive neuroscience!
New opening for a full-time lab tech in the Kanwisher Lab: This job is a great stepping stone to graduate programs in cognitive neuroscience. Demonstrated serious interest in cog neuro and good coding skills required. Machine learning skills a plus.
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@sugsharma
Sugandha Sharma
3 months
One hypothesis is that this is because episodic memory is enabled by pre-structured spatial representations that support high-capacity memory. Some of these ideas are fleshed in this work: Tweeprint:
@sugsharma
Sugandha Sharma
3 months
Finally a tweeprint on our recent preprint presenting Vector-HaSH ! Vector-HaSH extends MESH to unify two important and seemingly independent roles of hippocampus: Spatial Mapping and Episodic Memory ! Brief talk: Preprint: 1/n
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@sugsharma
Sugandha Sharma
3 years
Omg, this is so uncanny. Checkout the follow up in the thread too!
@TimKietzmann
Tim Kietzmann
3 years
Comic from 1997.
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@sugsharma
Sugandha Sharma
3 years
Happy to have contributed to this insightful preview lead by @honisanders . Here's the updated link:
@honisanders
Honi Sanders
4 years
Just published a Preview: describing the work of @jcrwhittington and @behrenstimb in creating the Tolman Eichenbaum machine.
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@sugsharma
Sugandha Sharma
2 years
Congratulations Dr. Andrew Francl !
@JoshHMcDermott
Josh McDermott
2 years
Many congrats to Dr. Andrew Francl for an excellent defense of his thesis, "Modeling and Evaluating Human Sound Localization in the Natural Environment! I was a bit bummed to attend virtually due to a sick kid, but very proud of all his great work over the past 6 years!
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@sugsharma
Sugandha Sharma
3 years
@iclr_conf Excited to present my work on Modular networks for high capacity pattern and sequence memory @ICLR_brains today! Drop by to chat and learn about a neural architecture inspired by the entorhinal-hippocampal system in the brain!
@ICLR_brains
ICLR Generalization Workshop
3 years
Today's the day! Join us: We will be posting updates throughout the day.
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@sugsharma
Sugandha Sharma
2 years
I would like to thank @MIT , @mitbrainandcog , the ICoN center @mcgovernmit , @MIT_CBMM and @NSF for enabling this research. If you would like to chat more in person and are going to #ICML2022 , please find me @BeyondBayes workshop @icmlconf where I will be presenting this work.
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@sugsharma
Sugandha Sharma
3 years
We taught a course titled "Brain as a Computing Device". Thanks to Akhilan Boopathy, @jaedong_hwang , and Sarthak Chandra from @FieteGroup ; Kartik Chandra from @MITCoCoSci and @vin_agarwal from McDermott lab @mitbrainandcog for joining me in teaching this course to 45 students!
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