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Lesson 2 - Deep Learning 2018-JNxcznsrRb8.en.vtt
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WEBVTT
Kind: captions
Language: en
Style:
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##
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<c.colorCCCCCC>okay<00:00:00.750><c> so</c><00:00:00.810><c> welcome</c></c><c.colorE5E5E5><00:00:01.170><c> back</c></c><c.colorCCCCCC><00:00:01.319><c> to</c><00:00:02.210><c> deep</c><00:00:03.210><c> learning</c></c>
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<c.colorCCCCCC>be<00:08:14.610><c> so</c><00:08:14.850><c> big</c></c><c.colorE5E5E5><00:08:15.150><c> that</c><00:08:15.930><c> the</c><00:08:16.080><c> loss</c><00:08:16.230><c> will</c><00:08:16.440><c> start</c></c>
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<c.colorE5E5E5>this</c>
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wrote<c.colorCCCCCC><00:11:52.189><c> it</c><00:11:52.249><c> Leslie</c><00:11:52.639><c> Smith</c><00:11:52.819><c> knows</c><00:11:53.059><c> about</c><00:11:53.269><c> it</c></c>
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yeah<00:11:54.759><c> so</c><00:11:55.759><c> it's</c><00:11:55.879><c> a</c><00:11:55.939><c> good</c><c.colorE5E5E5><00:11:56.059><c> thing</c></c><c.colorCCCCCC><00:11:56.119><c> to</c><00:11:56.449><c> tell</c></c><c.colorE5E5E5><00:11:56.629><c> your</c></c>
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colleagues<c.colorE5E5E5><00:11:57.230><c> about</c><00:11:57.559><c> is</c><00:11:57.889><c> like</c><00:11:58.100><c> here</c><00:11:58.879><c> is</c></c>
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<c.colorE5E5E5>like<00:12:03.439><c> one</c><00:12:03.589><c> of</c><00:12:03.679><c> the</c></c><c.colorCCCCCC><00:12:03.769><c> famous</c><00:12:04.069><c> papers</c><00:12:04.339><c> is</c><00:12:04.490><c> called</c></c>
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actually<00:12:07.759><c> is</c><00:12:07.999><c> a</c><00:12:08.269><c> less</c><00:12:08.569><c> effective</c><00:12:08.990><c> technique</c>
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setting<00:12:11.420><c> learning</c><00:12:11.689><c> rates</c><00:12:11.869><c> is</c><00:12:12.050><c> is</c><00:12:12.709><c> very</c>
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<c.colorE5E5E5>difficult<00:12:13.730><c> and</c><00:12:13.939><c> thirdly</c><00:12:14.149><c> is</c><00:12:14.600><c> has</c><00:12:15.050><c> been</c><00:12:15.350><c> true</c></c>
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<c.colorCCCCCC>for<00:12:16.040><c> most</c><00:12:16.189><c> of</c><00:12:16.429><c> the</c><00:12:16.730><c> kind</c><00:12:17.179><c> of</c><00:12:17.209><c> deep</c><00:12:17.420><c> learning</c></c>
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history<c.colorE5E5E5><00:12:18.519><c> so</c><00:12:19.519><c> here's</c><00:12:19.759><c> the</c><00:12:19.879><c> trick</c><00:12:20.089><c> right</c><00:12:20.269><c> go</c></c>
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<c.colorE5E5E5>lowest<00:12:23.449><c> to</c><00:12:23.689><c> go</c><00:12:23.839><c> back</c><00:12:24.079><c> about</c><00:12:24.230><c> a</c><00:12:24.379><c> multiple</c></c><c.colorCCCCCC><00:12:24.679><c> of</c></c>
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<c.colorCCCCCC>ten<00:12:25.249><c> and</c><00:12:25.610><c> try</c><00:12:26.240><c> that</c><00:12:26.449><c> all</c></c><c.colorE5E5E5><00:12:26.959><c> right</c><00:12:27.079><c> and</c><00:12:27.319><c> if</c><00:12:27.889><c> that</c></c>
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doesn't<c.colorE5E5E5><00:12:28.309><c> quite</c><00:12:28.550><c> work</c><00:12:28.610><c> you</c><00:12:28.970><c> can</c><00:12:29.089><c> always</c><00:12:29.300><c> try</c></c>
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you<00:12:29.569><c> know</c><00:12:29.839><c> going</c><00:12:30.170><c> back</c><00:12:30.290><c> another</c><c.colorCCCCCC><00:12:30.559><c> multiple</c></c><c.colorE5E5E5><00:12:31.040><c> ten</c></c>
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but<00:12:31.399><c> this</c><00:12:31.490><c> is</c><c.colorCCCCCC><00:12:31.610><c> always</c><00:12:31.850><c> worked</c></c><c.colorE5E5E5><00:12:32.059><c> for</c><00:12:32.209><c> me</c><00:12:32.300><c> so</c><00:12:32.509><c> far</c></c>
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once<00:12:40.779><c> why</c><00:12:41.779><c> does</c><00:12:41.929><c> this</c><00:12:42.079><c> learning</c><00:12:42.439><c> rate</c><00:12:42.709><c> this</c>
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<c.colorE5E5E5>method<00:12:43.879><c> work</c><00:12:44.059><c> versus</c><00:12:44.689><c> something</c><00:12:45.079><c> else</c><00:12:45.319><c> like</c></c>
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<c.colorCCCCCC>momentum</c><c.colorE5E5E5><00:12:46.399><c> base</c><00:12:46.579><c> or</c><00:12:46.879><c> what's</c><00:12:47.480><c> like</c><00:12:47.629><c> the</c></c>
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advantages<c.colorCCCCCC><00:12:48.230><c> a</c><00:12:48.529><c> disadvantage</c></c><c.colorE5E5E5><00:12:49.100><c> with</c><00:12:49.670><c> just</c></c>
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learning<00:12:50.569><c> rate</c><00:12:50.720><c> rate</c><00:12:51.050><c> like</c><00:12:51.290><c> technique</c><c.colorCCCCCC><00:12:51.829><c> we're</c></c>
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<c.colorE5E5E5>just<00:12:52.129><c> feels</c><00:12:58.059><c> that's</c></c><c.colorCCCCCC><00:12:59.059><c> a</c><00:12:59.179><c> great</c></c><c.colorE5E5E5><00:12:59.360><c> question</c></c><c.colorCCCCCC><00:12:59.809><c> so</c></c>
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<c.colorE5E5E5>we're<00:13:01.189><c> going</c><00:13:01.309><c> to</c><00:13:01.370><c> learn</c><00:13:01.550><c> during</c><00:13:01.759><c> this</c><00:13:01.910><c> course</c></c>
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about<c.colorE5E5E5><00:13:02.389><c> a</c><00:13:02.509><c> number</c><00:13:02.899><c> of</c><00:13:03.019><c> ways</c><00:13:03.199><c> of</c><00:13:03.350><c> improving</c></c>
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<c.colorCCCCCC>gradient</c><c.colorE5E5E5><00:13:04.429><c> percent</c><00:13:04.759><c> like</c><00:13:04.999><c> you</c><00:13:05.329><c> mentioned</c></c>
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momentum<00:13:06.199><c> and</c><c.colorE5E5E5><00:13:06.470><c> atom</c><00:13:07.279><c> and</c><00:13:07.490><c> so</c><00:13:07.670><c> forth</c><00:13:07.999><c> this</c><00:13:08.629><c> is</c></c>
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<c.colorCCCCCC>orthogonal</c><c.colorE5E5E5><00:13:09.319><c> in</c><00:13:09.620><c> fact</c><00:13:09.920><c> so</c><00:13:10.399><c> one</c></c><c.colorCCCCCC><00:13:10.579><c> of</c><00:13:10.670><c> the</c><00:13:10.759><c> things</c></c>
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<c.colorCCCCCC>the<00:13:11.120><c> faster</c></c><c.colorE5E5E5><00:13:11.480><c> a</c><00:13:11.509><c> library</c><00:13:11.929><c> tries</c><00:13:12.139><c> to</c><00:13:12.319><c> do</c><00:13:12.499><c> is</c></c>
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figure<00:13:13.370><c> out</c><c.colorE5E5E5><00:13:13.490><c> the</c><00:13:13.850><c> right</c><00:13:14.110><c> gradient</c><00:13:15.110><c> descent</c></c>
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version<00:13:15.860><c> and</c><00:13:16.279><c> in</c><00:13:16.399><c> fact</c><c.colorE5E5E5><00:13:16.519><c> behind</c><00:13:16.639><c> the</c><00:13:16.910><c> scenes</c></c>
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this<c.colorE5E5E5><00:13:17.389><c> is</c><00:13:17.449><c> actually</c><00:13:17.809><c> using</c><00:13:17.959><c> something</c><00:13:18.230><c> called</c></c>
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<c.colorE5E5E5>atom<00:13:18.769><c> and</c><00:13:18.949><c> so</c><00:13:19.939><c> this</c><00:13:20.179><c> technique</c><00:13:20.569><c> is</c><00:13:20.749><c> telling</c><00:13:21.079><c> us</c></c>
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<c.colorE5E5E5>this</c><c.colorCCCCCC><00:13:21.379><c> is</c><00:13:21.499><c> the</c><00:13:21.529><c> best</c></c><c.colorE5E5E5><00:13:21.769><c> learning</c><00:13:22.220><c> rate</c><00:13:22.399><c> to</c><00:13:22.549><c> use</c></c>
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<c.colorE5E5E5>given<00:13:24.249><c> what</c><00:13:25.249><c> I</c><00:13:25.279><c> thought</c><00:13:25.490><c> other</c><00:13:25.730><c> tweaks</c><00:13:26.029><c> you're</c></c>
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using<00:13:26.600><c> in</c><00:13:26.779><c> this</c><c.colorE5E5E5><00:13:26.869><c> case</c><00:13:27.110><c> the</c><00:13:27.410><c> atom</c><00:13:27.949><c> optimizer</c></c><c.colorCCCCCC><00:13:28.399><c> so</c></c>
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it's<00:13:30.019><c> not</c><c.colorCCCCCC><00:13:30.290><c> that</c><00:13:30.529><c> there's</c><00:13:30.709><c> some</c></c><c.colorE5E5E5><00:13:30.769><c> compromise</c></c>
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between<00:13:31.549><c> this</c><00:13:31.819><c> and</c><c.colorCCCCCC><00:13:32.059><c> some</c><00:13:32.179><c> other</c><00:13:32.240><c> approaches</c></c>
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<c.colorE5E5E5>who<00:13:33.049><c> sits</c><00:13:33.319><c> on</c><00:13:33.470><c> top</c><00:13:33.620><c> of</c><00:13:33.679><c> those</c><00:13:33.949><c> approaches</c><00:13:34.490><c> and</c></c>
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you<00:13:34.790><c> still</c><00:13:35.029><c> have</c><00:13:35.209><c> to</c><c.colorE5E5E5><00:13:35.240><c> set</c><00:13:35.480><c> the</c><00:13:35.600><c> learning</c><00:13:35.870><c> rate</c></c>
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when<00:13:36.529><c> you</c><00:13:36.620><c> use</c><00:13:36.799><c> with</c><00:13:36.949><c> other</c><00:13:37.100><c> approaches</c><00:13:37.670><c> so</c>
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we're<00:13:38.360><c> trying</c><c.colorE5E5E5><00:13:38.480><c> to</c></c>
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find<00:13:38.839><c> the</c><00:13:38.990><c> best</c><00:13:39.170><c> kind</c><00:13:40.100><c> of</c><00:13:40.220><c> optimizer</c><00:13:40.670><c> to</c><00:13:40.910><c> use</c>
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for<00:13:41.149><c> a</c><c.colorE5E5E5><00:13:41.180><c> problem</c><00:13:41.569><c> that</c><00:13:41.990><c> you</c><00:13:42.079><c> still</c><00:13:42.259><c> have</c></c><c.colorCCCCCC><00:13:42.410><c> to</c><00:13:42.500><c> set</c></c>
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the<00:13:42.740><c> learning</c><00:13:43.009><c> rate</c><c.colorE5E5E5><00:13:43.129><c> and</c><00:13:43.490><c> this</c><00:13:43.670><c> is</c><00:13:43.790><c> how</c><00:13:43.910><c> we</c><00:13:43.970><c> can</c></c>
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do<c.colorE5E5E5><00:13:44.720><c> it</c><00:13:44.870><c> and</c><00:13:45.290><c> in</c><00:13:45.440><c> fact</c><00:13:45.529><c> this</c><00:13:45.709><c> idea</c><00:13:45.860><c> of</c></c><c.colorCCCCCC><00:13:46.129><c> using</c></c>
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this<00:13:46.579><c> technique</c><c.colorE5E5E5><00:13:46.940><c> on</c><00:13:47.149><c> top</c><00:13:47.420><c> of</c><00:13:47.709><c> more</c><00:13:48.709><c> advanced</c></c>
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optimizers<00:13:49.670><c> like</c><c.colorCCCCCC><00:13:49.819><c> Adam</c><00:13:50.149><c> might</c><00:13:50.269><c> haven't</c><00:13:50.509><c> even</c></c>
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seen<00:13:50.899><c> mentioned</c><00:13:51.529><c> in</c><00:13:51.649><c> a</c><00:13:51.709><c> paper</c><00:13:51.889><c> before</c><c.colorCCCCCC><00:13:52.129><c> so</c><00:13:52.550><c> I</c></c>
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think<c.colorE5E5E5><00:13:52.670><c> this</c><00:13:52.910><c> is</c><00:13:53.029><c> like</c><00:13:53.180><c> a</c><00:13:53.240><c> I</c><00:13:53.600><c> mean</c><00:13:54.050><c> it's</c><00:13:54.170><c> not</c><00:13:54.290><c> a</c></c>
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<c.colorE5E5E5>huge<00:13:55.100><c> breakthrough</c><00:13:55.339><c> it</c><00:13:55.670><c> seems</c></c><c.colorCCCCCC><00:13:55.879><c> obvious</c><00:13:56.240><c> but</c></c>
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<c.colorE5E5E5>nobody<00:13:56.750><c> else</c><00:13:56.899><c> seems</c><00:13:57.110><c> to</c><00:13:57.490><c> tried</c><00:13:58.490><c> it</c><00:13:58.670><c> so</c><00:13:59.300><c> as</c><00:13:59.509><c> you</c></c>
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can<c.colorE5E5E5><00:13:59.720><c> see</c><00:13:59.779><c> it</c><00:13:59.990><c> was</c><00:14:00.139><c> well</c></c>
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when<00:14:06.160><c> we</c><00:14:06.310><c> use</c><c.colorCCCCCC><00:14:06.510><c> optimizers</c><00:14:07.510><c> like</c><00:14:07.660><c> Adam</c></c><c.colorE5E5E5><00:14:08.020><c> ditched</c></c>
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<c.colorE5E5E5>Harvick<00:14:08.649><c> adaptive</c><00:14:09.339><c> learning</c><00:14:09.520><c> rate</c><00:14:09.850><c> so</c><00:14:10.149><c> and</c></c><c.colorCCCCCC><00:14:10.570><c> he</c></c>
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said<00:14:10.899><c> this</c><00:14:11.050><c> learning</c><00:14:11.380><c> rate</c><00:14:11.529><c> is</c><c.colorCCCCCC><00:14:11.589><c> Italy</c><00:14:11.890><c> initial</c></c>
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learning<c.colorE5E5E5><00:14:12.490><c> rate</c><00:14:12.790><c> because</c><00:14:13.149><c> it</c><00:14:13.300><c> changes</c><00:14:13.690><c> during</c></c>
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<c.colorE5E5E5>the<00:14:14.230><c> people</c><00:14:18.540><c> so</c><00:14:20.490><c> we're</c><00:14:21.490><c> going</c><00:14:21.580><c> to</c><00:14:21.640><c> be</c><00:14:21.730><c> learning</c></c>
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about<c.colorE5E5E5><00:14:22.089><c> things</c><00:14:22.540><c> like</c><00:14:22.630><c> Adam</c><00:14:23.050><c> the</c><00:14:23.620><c> details</c><00:14:24.010><c> about</c></c>
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<c.colorCCCCCC>it</c><c.colorE5E5E5><00:14:24.399><c> later</c><00:14:25.120><c> in</c><00:14:25.270><c> the</c><00:14:25.360><c> class</c><00:14:25.570><c> but</c></c><c.colorCCCCCC><00:14:25.870><c> the</c><00:14:26.020><c> basic</c></c>