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karpathy's profile
Andrej Karpathy
Andrej Karpathy
Andrej Karpathy
Verified account
@karpathy

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Andrej KarpathyVerified account

@karpathy

Director of AI at Tesla, leading the Autopilot Vision team. Previously OpenAI, CS231n, PhD @ Stanford. I like to train large deep neural nets 🧠🤖💥

Stanford
karpathy.ai
Joined April 2009

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    1. Andrej Karpathy‏Verified account @karpathy 15 Nov 2018

      ResNet-50 on ImageNet now (allegedly) down to 224sec (3.7min) https://arxiv.org/abs/1811.05233  using 2176 V100s. Increasing batch size schedule, LARS, 5 epoch LR warmup, synch BN without mov avg. (mixed) fp16 training. "2D-Torus" all-reduce on NCCL2, with NVLink2 & 2 IB EDR interconnect

      15 replies 122 retweets 452 likes
      Show this thread
    2. Andrej Karpathy‏Verified account @karpathy 15 Nov 2018

      Nice comparison table in the paper showing the wall clock time to 75% accuracy, over time. He et al. was CVPR 2016, so this is ~2-3 years to go 30 hours -> 3.7 minutes (~500X) 🔥pic.twitter.com/XI4qHF6OfV

      8 replies 38 retweets 120 likes
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    3. Andrej Karpathy‏Verified account @karpathy 15 Nov 2018

      so... if this rate keeps up then around 2020 we'd be training ImageNet to 75% accuracy in 0.5 seconds :)

      12 replies 28 retweets 195 likes
      Show this thread
      Andrej Karpathy‏Verified account @karpathy 16 Nov 2018

      last fun thing to think about is that we're doing 1.28M images over 90 epochs with 68K batches, so the entire optimization is ~1700 updates to converge. How lucky for us that our Universe allows us to trade that much serial compute for parallel compute in training neural nets

      12:10 AM - 16 Nov 2018
      • 32 Retweets
      • 298 Likes
      • Tapan jain Rohan Uprety Caleb Tobia Amit Malik⚡ Ayoub Elmajjodi Chris Rawles Raj Nathani Rohin Arora
      12 replies 32 retweets 298 likes
        1. Regina P‏ @repaveli_p 16 Nov 2018
          Replying to @karpathy

          “God” is statistically very likely to be an #AI from base reality trying to understand its surroundings by simulating an infinite #multiverse. 😱

          0 replies 1 retweet 11 likes
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        1. Hans Noordsij‏ @HansNoordsij 16 Nov 2018
          Replying to @karpathy

          Hans Noordsij Retweeted Hans Noordsij

          As always highly impressive. Can you give me some backup in my plan to use AI to turn Model 3 into kinda pacecar to regulate traffic? People getting interested over here and would be nice to hear this can be done.https://twitter.com/HansNoordsij/status/1062465481356050432 …

          Hans Noordsij added,

          Hans Noordsij @HansNoordsij
          @karpathy @elonmusk @tesla Can you help by writing software/algorithm that uses available road/traffic info to define optimal speed avoiding congestion and turns Model 3 into a (to be legalised) Pacecar. Fleet of a few hundred could cover full Dutch Hways, https://www.linkedin.com/pulse/solution-traffic-congestion-hans-noordsij/ …
          0 replies 0 retweets 4 likes
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        1. Earth~PASSION~SASSY~S3XY‏ @loves2giggle 16 Nov 2018
          Replying to @karpathy

          When you have a chance please dm me I would like to chat .

          0 replies 0 retweets 0 likes
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        1. New conversation
        2. Srinivasa sarma‏ @srinidoiks 16 Nov 2018
          Replying to @karpathy

          Is this still Tesla and not Volta? Would be interesting to see what Volta can achieve with tensor cores.

          1 reply 0 retweets 0 likes
        3. Kazioo 🚀‏ @KaziooFX 16 Nov 2018
          Replying to @srinidoiks @karpathy

          Nvidia Tesla is not an architecture, but a product name. Tesla V100 is Volta-based and does have Tensor Cores (P is Pascal-based).

          0 replies 0 retweets 3 likes
        4. End of conversation
        1. jimmah‏ @jamesdouma 16 Nov 2018
          Replying to @karpathy

          If the universe didn’t allow it we probably wouldn’t be here to appreciate it.

          0 replies 0 retweets 1 like
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        1. Cybergrade‏ @vicentes 16 Nov 2018
          Replying to @karpathy

          Cool. Is there a compute cost column for each row ?

          0 replies 0 retweets 1 like
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        1. CybrMadHatter  🔊‏ @OCCUPYMARS2025 16 Nov 2018
          Replying to @karpathy

          Yep, I do think about it, a lot!pic.twitter.com/AXUJcNCfEO

          0 replies 0 retweets 0 likes
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        1. Loveallspecies‏ @Kerrijai 16 Nov 2018
          Replying to @karpathy

          Imagine if we used this for the greater good' we stopped co2 emissions rising, stabilising the atmosphere and climate'. Bring on GACCA 'GLOBAL ART CAMPAIGN' CLIMATE ART' Let's Make governments ACt on Climate Change' love life' love your atmosphere 💞💓🌎💓👊 @elonmusk @mayemusk

          0 replies 0 retweets 1 like
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        1. Adam Raymer-Brown‏ @theraymerbrown 16 Nov 2018
          Replying to @karpathy

          My main takeaway is how little I know about neural nets.

          0 replies 0 retweets 2 likes
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