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josh_tobin_'s profile
Josh Tobin
Josh Tobin
Josh Tobin
@josh_tobin_

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Josh Tobin

@josh_tobin_

Research scientist @openai, PhD student @ucberkeley. Formerly @dormroomfund, @mckinsey

San Francisco, CA
josh-tobin.com
Joined July 2011

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    Josh Tobin‏ @josh_tobin_ Jan 25

    1/ Excited to share something I've been working on for a while now. Troubleshooting Deep Neural Networks: a decision tree for debugging your model and improving performance.http://josh-tobin.com/troubleshooting-deep-neural-networks …

    8:05 AM - 25 Jan 2019
    • 245 Retweets
    • 928 Likes
    • Amit Kapoor Rick Pratik Bhavsar Gunnlaugur Þór Briem AYMAN EL SHARIFايمن الشريف Boris Dayma Todd and Leah Rae Jeffrey Feldberg zuxfoucault
    8 replies 245 retweets 928 likes
      1. New conversation
      2. Josh Tobin‏ @josh_tobin_ Jan 25

        2/ I wrote this to codify some (often painful) lessons I learned as I got started in deep learning. Hope it can help others avoid some of my mistakes. Thanks to my coworkers at @berkeley_ai and @OpenAI, and especially @sergeykarayev and @pabbeel for helping me put this together.

        1 reply 4 retweets 18 likes
        Show this thread
      3. Josh Tobin‏ @josh_tobin_ Jan 25

        3/ I’d love your feedback. What are your favorite DL debugging / troubleshooting tricks? Will share an updated version with everyone’s suggestions.

        7 replies 2 retweets 13 likes
        Show this thread
      4. Josh Tobin‏ @josh_tobin_ Jan 25

        Josh Tobin Retweeted Andrej Karpathy

        4/ A few other great resources on this topic I've seen: @AndrewYNg's http://mlyearning.org , @karpathy's thread https://twitter.com/karpathy/status/1013244313327681536 …, and this blog post https://pcc.cs.byu.edu/2017/10/02/practical-advice-for-building-deep-neural-networks/ …

        Josh Tobin added,

        Andrej KarpathyVerified account @karpathy
        most common neural net mistakes: 1) you didn't try to overfit a single batch first. 2) you forgot to toggle train/eval mode for the net. 3) you forgot to .zero_grad() (in pytorch) before .backward(). 4) you passed softmaxed outputs to a loss that expects raw logits. ; others? :)
        Show this thread
        0 replies 2 retweets 27 likes
        Show this thread
      5. End of conversation
      1. New conversation
      2. Phúc Lê‏ @lkhphuc Jan 26
        Replying to @josh_tobin_ @karpathy

        Very helpful guide. Another debugging trick for the notebook users is: when Exception, create a new cell with %debug, it will jump you right back in where the Exception occur with all the values ready to be inspected.

        1 reply 1 retweet 3 likes
      3. Josh Tobin‏ @josh_tobin_ Jan 27
        Replying to @lkhphuc @karpathy

        nice, never knew that!

        0 replies 0 retweets 1 like
      4. End of conversation
      1. New conversation
      2. ml_shgidi‏ @shgidi Feb 2
        Replying to @josh_tobin_

        Thanks! looks very nice. Is there by any chance non ppt version?

        1 reply 0 retweets 0 likes
      3. Josh Tobin‏ @josh_tobin_ Feb 3
        Replying to @shgidi

        Slides are in pdf, that’s all at this point, may turn it into a blog post some day

        0 replies 0 retweets 1 like
      4. End of conversation
      1. Ali Hummos‏ @Ahummos Jan 28
        Replying to @josh_tobin_

        The best part is how it validates the soul-crushing frustration that comes naturally with deep learning. Thank you!

        0 replies 0 retweets 1 like
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      1. Eswara Prasad‏ @neprasad Jan 26
        Replying to @josh_tobin_ @karpathy

        Really useful tool.

        0 replies 0 retweets 1 like
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      1. sarath.r.nair‏ @iamsarath Jan 26
        Replying to @josh_tobin_ @karpathy

        Valid points.

        0 replies 0 retweets 1 like
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      1. Vignesh Baskaran‏ @tweetvbaskaran Jan 26
        Replying to @josh_tobin_ @karpathy

        Wonderful guide! Will be extremely useful. Thank you

        0 replies 0 retweets 1 like
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      1. Maxime Lenormand‏ @MaxLenormand Jan 25
        Replying to @josh_tobin_

        Thank you very much for taking the time to do this! Like many, I am getting started in DNN, and this will be a very useful tool for my learning! I really appreciate that some people take the time to make this knowledge more and more accessible!

        0 replies 0 retweets 1 like
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