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---
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title: "lexicap"
permalink: /lexicap.html
exclude: true
---
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
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<title>Lexicap</title>
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<h2>Yann LeCun: Dark Matter of Intelligence and Self-Supervised Learning | Lex Fridman Podcast #258</h2>
<div id="player"></div>
<script>
var tag = document.createElement('script');
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<div class="c">
<a class="l" href="#00:00:0.00" id="00:00:0.00">link</a> |
<div class="s"><a href="javascript:void(0);" onclick=setCurrentTime(0)>00:00:0.00</a></div>
<div class="t">[Lex] The following is a conversation with Yann LeCun,</div>
</div>
<div class="c">
<a class="l" href="#00:00:2.75" id="00:00:2.75">link</a> |
<div class="s"><a href="javascript:void(0);" onclick=setCurrentTime(2)>00:00:2.75</a></div>
<div class="t">[Lex] his second time on the podcast.</div>
</div>
<div class="c">
<a class="l" href="#00:00:4.59" id="00:00:4.59">link</a> |
<div class="s"><a href="javascript:void(0);" onclick=setCurrentTime(4)>00:00:4.59</a></div>
<div class="t">[Lex] He is the chief AI scientist at Meta, formerly Facebook,</div>
</div>
<div class="c">
<a class="l" href="#00:00:9.19" id="00:00:9.19">link</a> |
<div class="s"><a href="javascript:void(0);" onclick=setCurrentTime(9)>00:00:9.19</a></div>
<div class="t">[Lex] professor at NYU, touring award winner,</div>
</div>
<div class="c">
<a class="l" href="#00:00:13.07" id="00:00:13.07">link</a> |
<div class="s"><a href="javascript:void(0);" onclick=setCurrentTime(13)>00:00:13.07</a></div>
<div class="t">[Lex] one of the seminal figures in the history</div>
</div>
<div class="c">
<a class="l" href="#00:00:15.63" id="00:00:15.63">link</a> |
<div class="s"><a href="javascript:void(0);" onclick=setCurrentTime(15)>00:00:15.63</a></div>
<div class="t">[Lex] of machine learning and artificial intelligence,</div>
</div>
<div class="c">
<a class="l" href="#00:00:18.49" id="00:00:18.49">link</a> |
<div class="s"><a href="javascript:void(0);" onclick=setCurrentTime(18)>00:00:18.49</a></div>
<div class="t">[Lex] and someone who is brilliant and opinionated</div>
</div>
<div class="c">
<a class="l" href="#00:00:21.97" id="00:00:21.97">link</a> |
<div class="s"><a href="javascript:void(0);" onclick=setCurrentTime(21)>00:00:21.97</a></div>
<div class="t">[Lex] in the best kind of way,</div>
</div>
<div class="c">
<a class="l" href="#00:00:23.43" id="00:00:23.43">link</a> |
<div class="s"><a href="javascript:void(0);" onclick=setCurrentTime(23)>00:00:23.43</a></div>
<div class="t">[Lex] and so is always fun to talk to.</div>
</div>
<div class="c">
<a class="l" href="#00:00:25.99" id="00:00:25.99">link</a> |
<div class="s"><a href="javascript:void(0);" onclick=setCurrentTime(25)>00:00:25.99</a></div>
<div class="t">[Lex] This is the Lex Friedman podcast.</div>
</div>
<div class="c">
<a class="l" href="#00:00:27.99" id="00:00:27.99">link</a> |
<div class="s"><a href="javascript:void(0);" onclick=setCurrentTime(27)>00:00:27.99</a></div>
<div class="t">[Lex] To support it, please check out our sponsors</div>
</div>
<div class="c">
<a class="l" href="#00:00:29.95" id="00:00:29.95">link</a> |
<div class="s"><a href="javascript:void(0);" onclick=setCurrentTime(29)>00:00:29.95</a></div>
<div class="t">[Lex] in the description.</div>
</div>
<div class="c">
<a class="l" href="#00:00:31.23" id="00:00:31.23">link</a> |
<div class="s"><a href="javascript:void(0);" onclick=setCurrentTime(31)>00:00:31.23</a></div>
<div class="t">[Lex] And now, here's my conversation with Yann LeCun.</div>
</div>
<div class="c">
<a class="l" href="#00:00:36.15" id="00:00:36.15">link</a> |
<div class="s"><a href="javascript:void(0);" onclick=setCurrentTime(36)>00:00:36.15</a></div>
<div class="t">[Lex] You co-wrote the article,</div>
</div>
<div class="c">
<a class="l" href="#00:00:37.49" id="00:00:37.49">link</a> |
<div class="s"><a href="javascript:void(0);" onclick=setCurrentTime(37)>00:00:37.49</a></div>
<div class="t">[Lex] "'Self-Supervised Learning,</div>
</div>
<div class="c">
<a class="l" href="#00:00:38.85" id="00:00:38.85">link</a> |
<div class="s"><a href="javascript:void(0);" onclick=setCurrentTime(38)>00:00:38.85</a></div>
<div class="t">[Lex] the Dark Matter of Intelligence."</div>
</div>
<div class="c">
<a class="l" href="#00:00:40.89" id="00:00:40.89">link</a> |
<div class="s"><a href="javascript:void(0);" onclick=setCurrentTime(40)>00:00:40.89</a></div>
<div class="t">[Lex] Great title, by the way, with Ishan Mizra.</div>
</div>
<div class="c">
<a class="l" href="#00:00:43.71" id="00:00:43.71">link</a> |
<div class="s"><a href="javascript:void(0);" onclick=setCurrentTime(43)>00:00:43.71</a></div>
<div class="t">[Lex] So let me ask, what is self-supervised learning,</div>
</div>
<div class="c">
<a class="l" href="#00:00:46.61" id="00:00:46.61">link</a> |
<div class="s"><a href="javascript:void(0);" onclick=setCurrentTime(46)>00:00:46.61</a></div>
<div class="t">[Lex] and why is it the dark matter of intelligence?</div>
</div>
<div class="c">
<a class="l" href="#00:00:49.90" id="00:00:49.90">link</a> |
<div class="s"><a href="javascript:void(0);" onclick=setCurrentTime(49)>00:00:49.90</a></div>
<div class="t">[Yann] I'll start by the dark matter part.</div>
</div>
<div class="c">
<a class="l" href="#00:00:51.70" id="00:00:51.70">link</a> |
<div class="s"><a href="javascript:void(0);" onclick=setCurrentTime(51)>00:00:51.70</a></div>
<div class="t">[Yann] There is obviously a kind of learning</div>
</div>
<div class="c">
<a class="l" href="#00:00:55.70" id="00:00:55.70">link</a> |
<div class="s"><a href="javascript:void(0);" onclick=setCurrentTime(55)>00:00:55.70</a></div>
<div class="t">[Yann] that humans and animals are doing</div>
</div>
<div class="c">
<a class="l" href="#00:00:59.90" id="00:00:59.90">link</a> |
<div class="s"><a href="javascript:void(0);" onclick=setCurrentTime(59)>00:00:59.90</a></div>
<div class="t">[Yann] that we currently are not reproducing properly</div>
</div>
<div class="c">
<a class="l" href="#00:01:2.86" id="00:01:2.86">link</a> |
<div class="s"><a href="javascript:void(0);" onclick=setCurrentTime(62)>00:01:2.86</a></div>
<div class="t">[Yann] with machines or with AI, right?</div>
</div>
<div class="c">
<a class="l" href="#00:01:4.70" id="00:01:4.70">link</a> |
<div class="s"><a href="javascript:void(0);" onclick=setCurrentTime(64)>00:01:4.70</a></div>
<div class="t">[Yann] So the most popular approaches</div>
</div>
<div class="c">
<a class="l" href="#00:01:6.30" id="00:01:6.30">link</a> |
<div class="s"><a href="javascript:void(0);" onclick=setCurrentTime(66)>00:01:6.30</a></div>
<div class="t">[Yann] to machine learning today are,</div>
</div>
<div class="c">
<a class="l" href="#00:01:8.50" id="00:01:8.50">link</a> |
<div class="s"><a href="javascript:void(0);" onclick=setCurrentTime(68)>00:01:8.50</a></div>
<div class="t">[Yann] or paradigms, I should say,</div>
</div>
<div class="c">
<a class="l" href="#00:01:9.70" id="00:01:9.70">link</a> |
<div class="s"><a href="javascript:void(0);" onclick=setCurrentTime(69)>00:01:9.70</a></div>
<div class="t">[Yann] are supervised learning and reinforcement learning.</div>
</div>
<div class="c">
<a class="l" href="#00:01:12.74" id="00:01:12.74">link</a> |
<div class="s"><a href="javascript:void(0);" onclick=setCurrentTime(72)>00:01:12.74</a></div>
<div class="t">[Yann] And they are extremely inefficient.</div>
</div>
<div class="c">
<a class="l" href="#00:01:15.16" id="00:01:15.16">link</a> |
<div class="s"><a href="javascript:void(0);" onclick=setCurrentTime(75)>00:01:15.16</a></div>
<div class="t">[Yann] Supervised learning requires many samples</div>
</div>
<div class="c">
<a class="l" href="#00:01:17.66" id="00:01:17.66">link</a> |
<div class="s"><a href="javascript:void(0);" onclick=setCurrentTime(77)>00:01:17.66</a></div>
<div class="t">[Yann] for learning anything,</div>
</div>
<div class="c">
<a class="l" href="#00:01:19.78" id="00:01:19.78">link</a> |
<div class="s"><a href="javascript:void(0);" onclick=setCurrentTime(79)>00:01:19.78</a></div>
<div class="t">[Yann] and reinforcement learning requires</div>
</div>
<div class="c">
<a class="l" href="#00:01:21.82" id="00:01:21.82">link</a> |
<div class="s"><a href="javascript:void(0);" onclick=setCurrentTime(81)>00:01:21.82</a></div>
<div class="t">[Yann] a ridiculously large number of trial and errors</div>
</div>
<div class="c">
<a class="l" href="#00:01:25.24" id="00:01:25.24">link</a> |
<div class="s"><a href="javascript:void(0);" onclick=setCurrentTime(85)>00:01:25.24</a></div>
<div class="t">[Yann] for a system to learn anything.</div>
</div>
<div class="c">
<a class="l" href="#00:01:29.32" id="00:01:29.32">link</a> |
<div class="s"><a href="javascript:void(0);" onclick=setCurrentTime(89)>00:01:29.32</a></div>
<div class="t">[Yann] And that's why we don't have self-driving cars.</div>
</div>
<div class="c">
<a class="l" href="#00:01:32.95" id="00:01:32.95">link</a> |
<div class="s"><a href="javascript:void(0);" onclick=setCurrentTime(92)>00:01:32.95</a></div>
<div class="t">[Lex] That was a big leap from one to the other.</div>
</div>
<div class="c">
<a class="l" href="#00:01:34.79" id="00:01:34.79">link</a> |
<div class="s"><a href="javascript:void(0);" onclick=setCurrentTime(94)>00:01:34.79</a></div>
<div class="t">[Lex] Okay, so to solve difficult problems,</div>
</div>
<div class="c">
<a class="l" href="#00:01:38.77" id="00:01:38.77">link</a> |
<div class="s"><a href="javascript:void(0);" onclick=setCurrentTime(98)>00:01:38.77</a></div>
<div class="t">[Lex] you have to have a lot of human annotation</div>
</div>
<div class="c">
<a class="l" href="#00:01:42.35" id="00:01:42.35">link</a> |
<div class="s"><a href="javascript:void(0);" onclick=setCurrentTime(102)>00:01:42.35</a></div>
<div class="t">[Lex] for supervised learning to work.</div>
</div>
<div class="c">
<a class="l" href="#00:01:44.07" id="00:01:44.07">link</a> |
<div class="s"><a href="javascript:void(0);" onclick=setCurrentTime(104)>00:01:44.07</a></div>
<div class="t">[Lex] And to solve those difficult problems</div>
</div>
<div class="c">
<a class="l" href="#00:01:45.53" id="00:01:45.53">link</a> |
<div class="s"><a href="javascript:void(0);" onclick=setCurrentTime(105)>00:01:45.53</a></div>
<div class="t">[Lex] with reinforcement learning,</div>
</div>
<div class="c">
<a class="l" href="#00:01:46.69" id="00:01:46.69">link</a> |
<div class="s"><a href="javascript:void(0);" onclick=setCurrentTime(106)>00:01:46.69</a></div>
<div class="t">[Lex] you have to have some way to maybe simulate that problem</div>
</div>
<div class="c">
<a class="l" href="#00:01:50.23" id="00:01:50.23">link</a> |
<div class="s"><a href="javascript:void(0);" onclick=setCurrentTime(110)>00:01:50.23</a></div>
<div class="t">[Lex] such that you can do that large-scale kind of learning</div>
</div>
<div class="c">
<a class="l" href="#00:01:52.71" id="00:01:52.71">link</a> |
<div class="s"><a href="javascript:void(0);" onclick=setCurrentTime(112)>00:01:52.71</a></div>
<div class="t">[Lex] that reinforcement learning requires.</div>
</div>
<div class="c">
<a class="l" href="#00:01:54.51" id="00:01:54.51">link</a> |
<div class="s"><a href="javascript:void(0);" onclick=setCurrentTime(114)>00:01:54.51</a></div>
<div class="t">[Yann] Right, so how is it that most teenagers</div>
</div>
<div class="c">
<a class="l" href="#00:01:58.01" id="00:01:58.01">link</a> |
<div class="s"><a href="javascript:void(0);" onclick=setCurrentTime(118)>00:01:58.01</a></div>
<div class="t">[Yann] can learn to drive a car in about 20 hours of practice?</div>
</div>
<div class="c">
<a class="l" href="#00:02:2.29" id="00:02:2.29">link</a> |
<div class="s"><a href="javascript:void(0);" onclick=setCurrentTime(122)>00:02:2.29</a></div>
<div class="t">[Yann] Whereas even with millions of hours of simulated practice,</div>
</div>
<div class="c">
<a class="l" href="#00:02:7.49" id="00:02:7.49">link</a> |
<div class="s"><a href="javascript:void(0);" onclick=setCurrentTime(127)>00:02:7.49</a></div>
<div class="t">[Yann] a self-driving car can't actually learn</div>
</div>
<div class="c">
<a class="l" href="#00:02:9.21" id="00:02:9.21">link</a> |
<div class="s"><a href="javascript:void(0);" onclick=setCurrentTime(129)>00:02:9.21</a></div>
<div class="t">[Yann] to drive itself properly.</div>
</div>
<div class="c">
<a class="l" href="#00:02:10.71" id="00:02:10.71">link</a> |
<div class="s"><a href="javascript:void(0);" onclick=setCurrentTime(130)>00:02:10.71</a></div>
<div class="t">[Yann] And so, obviously, we're missing something, right?</div>
</div>
<div class="c">
<a class="l" href="#00:02:12.63" id="00:02:12.63">link</a> |
<div class="s"><a href="javascript:void(0);" onclick=setCurrentTime(132)>00:02:12.63</a></div>
<div class="t">[Yann] And it's quite obvious for a lot of people</div>
</div>
<div class="c">
<a class="l" href="#00:02:14.35" id="00:02:14.35">link</a> |
<div class="s"><a href="javascript:void(0);" onclick=setCurrentTime(134)>00:02:14.35</a></div>
<div class="t">[Yann] that the immediate response you get from many people is,</div>
</div>
<div class="c">
<a class="l" href="#00:02:18.51" id="00:02:18.51">link</a> |
<div class="s"><a href="javascript:void(0);" onclick=setCurrentTime(138)>00:02:18.51</a></div>
<div class="t">[Yann] well, humans use their background knowledge</div>
</div>
<div class="c">
<a class="l" href="#00:02:21.51" id="00:02:21.51">link</a> |
<div class="s"><a href="javascript:void(0);" onclick=setCurrentTime(141)>00:02:21.51</a></div>
<div class="t">[Yann] to learn faster, and they're right.</div>
</div>
<div class="c">
<a class="l" href="#00:02:24.47" id="00:02:24.47">link</a> |
<div class="s"><a href="javascript:void(0);" onclick=setCurrentTime(144)>00:02:24.47</a></div>
<div class="t">[Yann] Now, how was that background knowledge acquired?</div>
</div>
<div class="c">
<a class="l" href="#00:02:26.95" id="00:02:26.95">link</a> |
<div class="s"><a href="javascript:void(0);" onclick=setCurrentTime(146)>00:02:26.95</a></div>
<div class="t">[Yann] And that's the big question.</div>
</div>
<div class="c">
<a class="l" href="#00:02:28.78" id="00:02:28.78">link</a> |
<div class="s"><a href="javascript:void(0);" onclick=setCurrentTime(148)>00:02:28.78</a></div>
<div class="t">[Yann] So now you have to ask,</div>
</div>
<div class="c">
<a class="l" href="#00:02:31.14" id="00:02:31.14">link</a> |
<div class="s"><a href="javascript:void(0);" onclick=setCurrentTime(151)>00:02:31.14</a></div>
<div class="t">[Yann] how do babies in the first few months of life</div>
</div>
<div class="c">
<a class="l" href="#00:02:33.78" id="00:02:33.78">link</a> |
<div class="s"><a href="javascript:void(0);" onclick=setCurrentTime(153)>00:02:33.78</a></div>
<div class="t">[Yann] learn how the world works?</div>
</div>
<div class="c">
<a class="l" href="#00:02:35.90" id="00:02:35.90">link</a> |
<div class="s"><a href="javascript:void(0);" onclick=setCurrentTime(155)>00:02:35.90</a></div>
<div class="t">[Yann] Mostly by observation,</div>
</div>
<div class="c">
<a class="l" href="#00:02:36.90" id="00:02:36.90">link</a> |
<div class="s"><a href="javascript:void(0);" onclick=setCurrentTime(156)>00:02:36.90</a></div>
<div class="t">[Yann] because they can hardly act in the world.</div>
</div>
<div class="c">
<a class="l" href="#00:02:39.34" id="00:02:39.34">link</a> |
<div class="s"><a href="javascript:void(0);" onclick=setCurrentTime(159)>00:02:39.34</a></div>
<div class="t">[Yann] And they learn an enormous amount</div>
</div>
<div class="c">
<a class="l" href="#00:02:41.02" id="00:02:41.02">link</a> |
<div class="s"><a href="javascript:void(0);" onclick=setCurrentTime(161)>00:02:41.02</a></div>
<div class="t">[Yann] of background knowledge about the world</div>
</div>
<div class="c">
<a class="l" href="#00:02:42.30" id="00:02:42.30">link</a> |
<div class="s"><a href="javascript:void(0);" onclick=setCurrentTime(162)>00:02:42.30</a></div>
<div class="t">[Yann] that may be the basis of what we call common sense.</div>
</div>
<div class="c">
<a class="l" href="#00:02:46.50" id="00:02:46.50">link</a> |
<div class="s"><a href="javascript:void(0);" onclick=setCurrentTime(166)>00:02:46.50</a></div>
<div class="t">[Yann] This type of learning is not learning a task,</div>
</div>
<div class="c">
<a class="l" href="#00:02:49.74" id="00:02:49.74">link</a> |
<div class="s"><a href="javascript:void(0);" onclick=setCurrentTime(169)>00:02:49.74</a></div>
<div class="t">[Yann] it's not being reinforced for anything,</div>
</div>
<div class="c">
<a class="l" href="#00:02:52.02" id="00:02:52.02">link</a> |
<div class="s"><a href="javascript:void(0);" onclick=setCurrentTime(172)>00:02:52.02</a></div>
<div class="t">[Yann] it's just observing the world and figuring out how it works.</div>
</div>
<div class="c">
<a class="l" href="#00:02:56.73" id="00:02:56.73">link</a> |
<div class="s"><a href="javascript:void(0);" onclick=setCurrentTime(176)>00:02:56.73</a></div>
<div class="t">[Yann] Building world models, learning world models.</div>
</div>
<div class="c">
<a class="l" href="#00:02:59.69" id="00:02:59.69">link</a> |
<div class="s"><a href="javascript:void(0);" onclick=setCurrentTime(179)>00:02:59.69</a></div>
<div class="t">[Yann] How do we do this?</div>
</div>
<div class="c">
<a class="l" href="#00:03:0.53" id="00:03:0.53">link</a> |
<div class="s"><a href="javascript:void(0);" onclick=setCurrentTime(180)>00:03:0.53</a></div>
<div class="t">[Yann] And how do we reproduce this in machines?</div>
</div>
<div class="c">
<a class="l" href="#00:03:3.01" id="00:03:3.01">link</a> |
<div class="s"><a href="javascript:void(0);" onclick=setCurrentTime(183)>00:03:3.01</a></div>
<div class="t">[Yann] So self-supervised learning is a very, very important thing</div>
</div>
<div class="c">
<a class="l" href="#00:03:6.01" id="00:03:6.01">link</a> |
<div class="s"><a href="javascript:void(0);" onclick=setCurrentTime(186)>00:03:6.01</a></div>
<div class="t">[Yann] is one instance or one attempt</div>
</div>
<div class="c">
<a class="l" href="#00:03:10.29" id="00:03:10.29">link</a> |
<div class="s"><a href="javascript:void(0);" onclick=setCurrentTime(190)>00:03:10.29</a></div>
<div class="t">[Yann] at trying to reproduce this kind of learning.</div>
</div>
<div class="c">
<a class="l" href="#00:03:13.07" id="00:03:13.07">link</a> |
<div class="s"><a href="javascript:void(0);" onclick=setCurrentTime(193)>00:03:13.07</a></div>
<div class="t">[Lex] Okay, so you're looking at just observation,</div>
</div>
<div class="c">
<a class="l" href="#00:03:16.35" id="00:03:16.35">link</a> |
<div class="s"><a href="javascript:void(0);" onclick=setCurrentTime(196)>00:03:16.35</a></div>
<div class="t">[Lex] so not even the interacting part of a child.</div>
</div>
<div class="c">
<a class="l" href="#00:03:18.67" id="00:03:18.67">link</a> |
<div class="s"><a href="javascript:void(0);" onclick=setCurrentTime(198)>00:03:18.67</a></div>
<div class="t">[Lex] It's just sitting there watching mom and dad walk around,</div>
</div>
<div class="c">
<a class="l" href="#00:03:21.55" id="00:03:21.55">link</a> |
<div class="s"><a href="javascript:void(0);" onclick=setCurrentTime(201)>00:03:21.55</a></div>
<div class="t">[Lex] pick up stuff, all of that.</div>
</div>
<div class="c">
<a class="l" href="#00:03:23.43" id="00:03:23.43">link</a> |
<div class="s"><a href="javascript:void(0);" onclick=setCurrentTime(203)>00:03:23.43</a></div>
<div class="t">[Lex] That's what we mean by background knowledge.</div>
</div>
<div class="c">
<a class="l" href="#00:03:25.49" id="00:03:25.49">link</a> |
<div class="s"><a href="javascript:void(0);" onclick=setCurrentTime(205)>00:03:25.49</a></div>
<div class="t">[Yann] Perhaps not even watching mom and dad,</div>
</div>
<div class="c">
<a class="l" href="#00:03:29.96" id="00:03:29.96">link</a> |
<div class="s"><a href="javascript:void(0);" onclick=setCurrentTime(209)>00:03:29.96</a></div>
<div class="t">[Lex] Just having eyes open or having eyes closed</div>
</div>
<div class="c">
<a class="l" href="#00:03:31.88" id="00:03:31.88">link</a> |
<div class="s"><a href="javascript:void(0);" onclick=setCurrentTime(211)>00:03:31.88</a></div>
<div class="t">[Lex] or the very act of opening and closing eyes</div>
</div>
<div class="c">
<a class="l" href="#00:03:34.44" id="00:03:34.44">link</a> |
<div class="s"><a href="javascript:void(0);" onclick=setCurrentTime(214)>00:03:34.44</a></div>
<div class="t">[Lex] that the world appears and disappears,</div>
</div>
<div class="c">
<a class="l" href="#00:03:36.24" id="00:03:36.24">link</a> |
<div class="s"><a href="javascript:void(0);" onclick=setCurrentTime(216)>00:03:36.24</a></div>
<div class="t">[Lex] all that basic information.</div>
</div>
<div class="c">
<a class="l" href="#00:03:39.10" id="00:03:39.10">link</a> |
<div class="s"><a href="javascript:void(0);" onclick=setCurrentTime(219)>00:03:39.10</a></div>
<div class="t">[Lex] And you're saying in order to learn to drive,</div>
</div>
<div class="c">
<a class="l" href="#00:03:43.10" id="00:03:43.10">link</a> |
<div class="s"><a href="javascript:void(0);" onclick=setCurrentTime(223)>00:03:43.10</a></div>
<div class="t">[Lex] like the reason humans are able to learn to drive quickly,</div>
</div>
<div class="c">
<a class="l" href="#00:03:45.82" id="00:03:45.82">link</a> |
<div class="s"><a href="javascript:void(0);" onclick=setCurrentTime(225)>00:03:45.82</a></div>
<div class="t">[Lex] some faster than others,</div>
</div>
<div class="c">
<a class="l" href="#00:03:47.34" id="00:03:47.34">link</a> |
<div class="s"><a href="javascript:void(0);" onclick=setCurrentTime(227)>00:03:47.34</a></div>
<div class="t">[Lex] is because of the background knowledge</div>
</div>
<div class="c">
<a class="l" href="#00:03:51.71" id="00:03:51.71">link</a> |
<div class="s"><a href="javascript:void(0);" onclick=setCurrentTime(231)>00:03:51.71</a></div>
<div class="t">[Lex] in the many years leading up to it,</div>
</div>
<div class="c">
<a class="l" href="#00:03:53.59" id="00:03:53.59">link</a> |
<div class="s"><a href="javascript:void(0);" onclick=setCurrentTime(233)>00:03:53.59</a></div>
<div class="t">[Lex] the physics of basic objects, all that.</div>
</div>
<div class="c">
<a class="l" href="#00:03:55.72" id="00:03:55.72">link</a> |
<div class="s"><a href="javascript:void(0);" onclick=setCurrentTime(235)>00:03:55.72</a></div>
<div class="t">[Yann] That's right.</div>
</div>
<div class="c">
<a class="l" href="#00:03:56.56" id="00:03:56.56">link</a> |
<div class="s"><a href="javascript:void(0);" onclick=setCurrentTime(236)>00:03:56.56</a></div>
<div class="t">[Yann] I mean, the basic physics of objects,</div>
</div>
<div class="c">
<a class="l" href="#00:03:57.40" id="00:03:57.40">link</a> |
<div class="s"><a href="javascript:void(0);" onclick=setCurrentTime(237)>00:03:57.40</a></div>
<div class="t">[Yann] you don't even need to know how a car works</div>
</div>
<div class="c">
<a class="l" href="#00:04:0.84" id="00:04:0.84">link</a> |
<div class="s"><a href="javascript:void(0);" onclick=setCurrentTime(240)>00:04:0.84</a></div>
<div class="t">[Yann] because that you can learn fairly quickly.</div>
</div>
<div class="c">
<a class="l" href="#00:04:2.47" id="00:04:2.47">link</a> |
<div class="s"><a href="javascript:void(0);" onclick=setCurrentTime(242)>00:04:2.47</a></div>
<div class="t">[Yann] I mean, the example I use very often</div>
</div>
<div class="c">
<a class="l" href="#00:04:3.79" id="00:04:3.79">link</a> |
<div class="s"><a href="javascript:void(0);" onclick=setCurrentTime(243)>00:04:3.79</a></div>
<div class="t">[Yann] is you're driving next to a cliff.</div>
</div>
<div class="c">
<a class="l" href="#00:04:6.62" id="00:04:6.62">link</a> |
<div class="s"><a href="javascript:void(0);" onclick=setCurrentTime(246)>00:04:6.62</a></div>
<div class="t">[Yann] And you know in advance because of your understanding</div>
</div>
<div class="c">
<a class="l" href="#00:04:10.54" id="00:04:10.54">link</a> |
<div class="s"><a href="javascript:void(0);" onclick=setCurrentTime(250)>00:04:10.54</a></div>
<div class="t">[Yann] of intuitive physics that if you turn the wheel</div>
</div>
<div class="c">
<a class="l" href="#00:04:13.14" id="00:04:13.14">link</a> |
<div class="s"><a href="javascript:void(0);" onclick=setCurrentTime(253)>00:04:13.14</a></div>
<div class="t">[Yann] to the right, the car will veer to the right,</div>
</div>
<div class="c">
<a class="l" href="#00:04:15.02" id="00:04:15.02">link</a> |
<div class="s"><a href="javascript:void(0);" onclick=setCurrentTime(255)>00:04:15.02</a></div>
<div class="t">[Yann] will run off the cliff, fall off the cliff,</div>
</div>
<div class="c">
<a class="l" href="#00:04:17.54" id="00:04:17.54">link</a> |
<div class="s"><a href="javascript:void(0);" onclick=setCurrentTime(257)>00:04:17.54</a></div>
<div class="t">[Yann] and nothing good will come out of this, right?</div>
</div>
<div class="c">
<a class="l" href="#00:04:20.38" id="00:04:20.38">link</a> |
<div class="s"><a href="javascript:void(0);" onclick=setCurrentTime(260)>00:04:20.38</a></div>
<div class="t">[Yann] But if you are a sort of tabularized</div>
</div>
<div class="c">
<a class="l" href="#00:04:23.74" id="00:04:23.74">link</a> |
<div class="s"><a href="javascript:void(0);" onclick=setCurrentTime(263)>00:04:23.74</a></div>
<div class="t">[Yann] reinforcement learning system</div>
</div>
<div class="c">
<a class="l" href="#00:04:25.06" id="00:04:25.06">link</a> |
<div class="s"><a href="javascript:void(0);" onclick=setCurrentTime(265)>00:04:25.06</a></div>
<div class="t">[Yann] that doesn't have a model of the world,</div>
</div>
<div class="c">
<a class="l" href="#00:04:28.14" id="00:04:28.14">link</a> |
<div class="s"><a href="javascript:void(0);" onclick=setCurrentTime(268)>00:04:28.14</a></div>
<div class="t">[Yann] you have to repeat falling off this cliff</div>
</div>
<div class="c">
<a class="l" href="#00:04:30.46" id="00:04:30.46">link</a> |
<div class="s"><a href="javascript:void(0);" onclick=setCurrentTime(270)>00:04:30.46</a></div>
<div class="t">[Yann] thousands of times before you figure out it's a bad idea.</div>
</div>
<div class="c">
<a class="l" href="#00:04:32.78" id="00:04:32.78">link</a> |
<div class="s"><a href="javascript:void(0);" onclick=setCurrentTime(272)>00:04:32.78</a></div>
<div class="t">[Yann] And then a few more thousand times</div>
</div>
<div class="c">
<a class="l" href="#00:04:34.54" id="00:04:34.54">link</a> |
<div class="s"><a href="javascript:void(0);" onclick=setCurrentTime(274)>00:04:34.54</a></div>
<div class="t">[Yann] before you figure out how to not do it.</div>
</div>
<div class="c">
<a class="l" href="#00:04:37.06" id="00:04:37.06">link</a> |
<div class="s"><a href="javascript:void(0);" onclick=setCurrentTime(277)>00:04:37.06</a></div>
<div class="t">[Yann] And then a few more million times before you figure out</div>
</div>
<div class="c">
<a class="l" href="#00:04:39.18" id="00:04:39.18">link</a> |
<div class="s"><a href="javascript:void(0);" onclick=setCurrentTime(279)>00:04:39.18</a></div>
<div class="t">[Yann] how to not do it in every situation you ever encounter.</div>
</div>
<div class="c">
<a class="l" href="#00:04:42.52" id="00:04:42.52">link</a> |
<div class="s"><a href="javascript:void(0);" onclick=setCurrentTime(282)>00:04:42.52</a></div>
<div class="t">[Lex] So self-supervised learning still has to have</div>
</div>
<div class="c">
<a class="l" href="#00:04:45.80" id="00:04:45.80">link</a> |
<div class="s"><a href="javascript:void(0);" onclick=setCurrentTime(285)>00:04:45.80</a></div>
<div class="t">[Lex] some source of truth being told to it by somebody.</div>
</div>
<div class="c">
<a class="l" href="#00:04:50.56" id="00:04:50.56">link</a> |
<div class="s"><a href="javascript:void(0);" onclick=setCurrentTime(290)>00:04:50.56</a></div>
<div class="t">[Lex] So you have to figure out a way without human assistance</div>
</div>
<div class="c">
<a class="l" href="#00:04:54.56" id="00:04:54.56">link</a> |
<div class="s"><a href="javascript:void(0);" onclick=setCurrentTime(294)>00:04:54.56</a></div>
<div class="t">[Lex] or without significant amount of human assistance</div>
</div>
<div class="c">
<a class="l" href="#00:04:56.60" id="00:04:56.60">link</a> |
<div class="s"><a href="javascript:void(0);" onclick=setCurrentTime(296)>00:04:56.60</a></div>
<div class="t">[Lex] to get that truth from the world.</div>
</div>
<div class="c">
<a class="l" href="#00:04:59.08" id="00:04:59.08">link</a> |
<div class="s"><a href="javascript:void(0);" onclick=setCurrentTime(299)>00:04:59.08</a></div>
<div class="t">[Lex] So the mystery there is how much signal is there,</div>
</div>
<div class="c">
<a class="l" href="#00:05:3.96" id="00:05:3.96">link</a> |
<div class="s"><a href="javascript:void(0);" onclick=setCurrentTime(303)>00:05:3.96</a></div>
<div class="t">[Lex] how much truth is there that the world gives you,</div>
</div>
<div class="c">
<a class="l" href="#00:05:6.28" id="00:05:6.28">link</a> |
<div class="s"><a href="javascript:void(0);" onclick=setCurrentTime(306)>00:05:6.28</a></div>
<div class="t">[Lex] whether it's the human world, like you watch YouTube</div>
</div>
<div class="c">
<a class="l" href="#00:05:9.12" id="00:05:9.12">link</a> |
<div class="s"><a href="javascript:void(0);" onclick=setCurrentTime(309)>00:05:9.12</a></div>
<div class="t">[Lex] or something like that, or it's the more natural world.</div>
</div>
<div class="c">
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<div class="t">[Lex] So how much signal is there?</div>
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<div class="t">[Yann] So here's the trick, there is way more signal</div>
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<div class="t">[Yann] in sort of a self-supervised setting</div>
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<div class="t">[Yann] than there is in either a supervised</div>
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<div class="t">[Yann] or reinforcement setting.</div>
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<div class="t">[Yann] And this is going to my analogy of the cake.</div>
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<div class="t">[Yann] The luck cake, as someone has called it,</div>
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<div class="t">[Yann] where when you try to figure out how much information</div>
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<div class="t">[Yann] you ask the machine to predict and how much feedback</div>
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<div class="t">[Yann] you give the machine at every trial.</div>
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<div class="t">[Yann] In reinforcement learning,</div>
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<div class="t">[Yann] you give the machine a single scalar.</div>
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<div class="t">[Yann] You tell the machine you did good, you did bad.</div>
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<div class="t">[Yann] And you only tell this to the machine once in a while.</div>
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<div class="t">[Yann] When I say you, it could be the universe</div>
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<div class="t">[Yann] telling the machine, right?</div>
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<div class="t">[Yann] But it's just one scalar.</div>
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<div class="t">[Yann] And so as a consequence,</div>
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<div class="t">[Yann] you cannot possibly learn something very complicated</div>
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<div class="t">[Yann] without many, many, many trials</div>
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<div class="t">[Yann] where you get many, many feedbacks of this type.</div>
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<div class="t">[Yann] Supervised learning, you give a few bits to the machine</div>
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<div class="t">[Yann] at every sample.</div>
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<div class="t">[Yann] Let's say you're training a system</div>
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<div class="t">[Yann] on recognizing images on ImageNet,</div>
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<div class="t">[Yann] there is 1,000 categories,</div>
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<div class="t">[Yann] that's a little less than 10 bits of information per sample.</div>
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<div class="t">[Yann] But self-supervised learning, here is the setting.</div>
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<div class="t">[Yann] You ideally, we don't know how to do this yet,</div>
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<div class="t">[Yann] but ideally you would show a machine a segment of a video</div>
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<div class="t">[Yann] and then stop the video and ask the machine to predict</div>
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<div class="t">[Yann] what's going to happen next.</div>
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<div class="t">[Yann] And so you let the machine predict</div>
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<div class="t">[Yann] and then you let time go by</div>
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<div class="t">[Yann] and show the machine what actually happened</div>
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<div class="t">[Yann] and hope the machine will learn to do a better job</div>
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<div class="t">[Yann] at predicting next time around.</div>
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<div class="t">[Yann] There's a huge amount of information you give the machine</div>
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<div class="t">[Yann] because it's an entire video clip.</div>