シャドーイング練習: SANA-Video: Efficient Video Generation with Block Linear Diffusion Transformer, [ICLR 2026, Oral] - 動画で英語スピーキングを学ぶ

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Thank you, Luke, for the amazing opening.

So good morning and thanks for having me.

My name is Jun Song.

I'm from the University of Hong Kong and NVIDIA.

It's really my great honor to present this work, SANA Video, for our SANA team.

So currently, generative AI is evolving rapidly with model sizes growing larger and larger.

At At the same time, AVIDIA GPUs are becoming increasingly powerful.

We can foresee that the future visual generative models will demand even more computational resources.

So actually, generating images and videos are significantly more computationally demanding than processing just text.

For example, the inference for Flux or CogVideoX exceed the Lama 3,

and an order of magnitude higher than the VIT models.

So they are restricted to cloud deployment and remain impractical for consumer GPUs or age devices.

So actually, efficiency is a forever topic.

So far, we have explored several directions for efficient video generation.

First, in Sanaa, we tried to reduce input tokens by using our self -developed deep compression autoencoder, DCAE.

We also try to use linear tension to replace Softmax 1, enhance the architectural efficiency of the model.

And we also already explored inference step distillation in Sanaa's spring project.

The fewer the inference steps, the faster the speed.

So the last part is what we are going to talk about today, the hybrid AR plus diffusion for long video generation.

Actually, we can generate video block by block causally and diffuse within the block.

So video generation requires much more computation than images.

SANA can generate one image within just one second.

However, generating a five -second video with one model actually takes nearly 30 minutes.

So to boost the video generation efficiency, we focus on three key technical areas, the high ratio VAEs and leaning attention mechanisms,

especially optimized for video tasks.

Crucially, the block KV cache based on leaning attention enables the generation of much longer videos.

So to get a video generation model, actually, we have two ways to go to try to choose.

First, we can just train from scratch.

But only when we have hundreds or thousands of GPUs,

like H100 GPUs, and it will take you almost several months to train one model.

And it's, of course, not affordable.

Or actually, we can start from a semantic aligned text -to -image model.

Here we start from our SANA 1 .5, which is a 1 .6 billion parameter text -to -image model trained on our DCAE.

Actually, since our video model is based on image model, so the linear tension DIT actually is almost the same as our SANA,

but we're introducing two modules for temporal modeling, and we will talk about them later.

Finally, on the left at the top, we implement block causal linear tension module to achieve constant kv cache memory.

So for any length video generation, So first, let's talk about linear attention in video generation model.

Actually, in video tasks, linear attention provides even more significant acceleration than in images,

as the video length and resolution are much larger.

Our results show that for long videos, SANA video is 1 .5 times faster than the one model.

And additionally, at high resolution, our linear attention is four times faster than the flash attention.

And these improvements make a long form, high resolution video generation much more practical.

However, we find that the linear attention map is far different from the softmax attention.

As you can see in this figure, the linear attention is super dense, while the softmax attention is rather sparse.

And this demonstrates that the local contacts captured by the linear tension is actually insufficient.

To enhance the temporal modeling, we introduced two key improvements.

First is the 3D rope for the linear tension and temporal convolutions.

And both are highlighted in the orange box.

While 3D rope doesn't solve the tension map sparsity problem entirely, it do help improve attention low quality.

Combined with our spatial temporal mix FFN, it significantly boosts the overall performance.

Here we have the training loss.

The green line stands for the 3D rope and the additional temporal convolution.

And to further support long video generation, we leverage the unique properties of linear attention to implement an efficient block KV cache.

So let's quickly review how this works.

In linear attention, we call it the attention map, or the state.

Actually, it has a fixed shape of D times D, regardless of the input sequence length.

So when processing the first block here, we obtain the state, S1.

And for the second block, the state is updated additably,

meaning that we only need to add the current block's contribution to the previous cache.

And generally for any block I,

actually the current state is updated as adding the current block contribution the KV here to the previous cache to ask.

So now let's see how we enable long video generation with block of causal linear attention.

For the first block here, the green one, we compute the state as one, shown in the green box.

After we compute first block the state, we cache it, it's shown in the red box.

Then we calculate the KV for the next block and add it to the previous one.

Here we take the cached state from block one in the red box and updates it into the block two, which is in the green color.

And the subsequent process follows the same logic.

The new state is cached, and once the next block competition is finished, they are summed together. And so on.

So, token in Valenian attention will become larger, more and more as the video length become larger and larger.

While our causal linear tension maintains a constant KV cache potentially make minute length video generation possible.

So here in conclusion, we can have two advantages of block linear tension.

First, we have constant memory usage regardless of the input sequence length and second we have the global history context.

So one last question is how to achieve causal FFN with temporal conf.

So let's take two block situation as example.

During causal training the block one cannot foresee block two so we pad a zero token here between the two blocks.

However block two must see block one's token so that it's correct the causal modeling.

So here we catch the last token from block one as the first token in block two.

So finally the two blocks are separated by the zero padding token

which is subsequently removed to to avoid affecting the final computation.

And the block two used the last token from block one making the the causal modeling available.

So here's some results, compared to the current state -of -the -art video models, Sonar Video performs competitively on VBench,

and it takes only 18 seconds to generate a 1K resolution video on a single H100 GPU.

Here we show some examples.

On the left we have text to video examples, And on the right, we show the image to video examples.

And using SANA video as a base model, it can be applied to tasks like physical AI and real -world models.

Actually, by fine -tuning SANA video on a small data site with just a few safety steps,

we enable it to generate videos for robotic manipulation and gameplay play.

We also combine with the post -training tech in long lab, which is a three long test long method.

And this method is also accurate poster and is also from our group.

We also implement the DMD step distillation to further accelerate our model.

And finally, Sonar Video you can also generate minute -length video within just 36 seconds,

achieving 27 FPS real -time generation.

So, finally, there is one more thing.

Based on linear attention, we have much more potential applications to discover.

We believe the efficiency of linear attention

and deep compression auto encoder will facilitate streaming video generation

and also the development of long form like minute -length or even hour -length, real -world models.

And we are working on this project and we'll see if we can keep pushing the efficiency boundary.

And all of our projects, including the code and checkpoints,

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are all open -source to encourage further exploration in efficient generative AI system.

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So that's all for my talk today.

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And we will have a poster session right after this aural, maybe in the afternoon.

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Welcome everyone to discuss more.

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Thanks so much.

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Thank you.

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Time for a quick question, if any.

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Yeah, please go to the mic.

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Thank you for your speech, and I have a question.

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I think it's something similar to the auto -aggressive video diffusion models like cause of it

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and something similar to the block causal linear attention you introduced.

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So I wanted to ask what are the key differences and if we are thinking about infinite long video generation,

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which one do you think would be better choice?

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Thank you.

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Thank you for your question.

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Actually the cause V something like that, they actually perform on soft max extension.

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So as I talked before, the soft max extension has an open square computation complexity.

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So if you want to generate mini lens or even hour lens video, it's not possible to do it on soft max extension.

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So if you want to generate mini lens video, so you have to keep the computation within like a sliding window or something like that.

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So the main difference here is our linear tension has the global context.

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It has memory from the first second to the final second.

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So if you want to do some project or task like world model,

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it has to be maintaining overall all the cache or the memory.

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So I think that's the main advantages of getting attention.

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Yeah, thank you.

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Thank you.

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このレッスンの語彙とスピーキングのポイント

このスピーキングレッスンは、動画「SANA-Video: Efficient Video Generation with Block Linear Diffusion Transformer,」を教材にしています。繰り返し出てくる語は次のとおりです：block, attention, model, linear, generation。この動画には、シャドーイング用の文が125文、単語が1634語あります。音声の長さは12:46です。話す速さは1分あたり約128語で安定しており、シャドーイングしやすいペースです。英語の頻出3,000語に含まれる単語は80%だけなので、語彙は難しめです。

この動画の重要語彙

動画に出てくる覚えておきたい単語15語を、発音と意味つきで紹介します。

単語	発音	意味
cache 名詞	/kæʃ/	キャッシュ
generate 動詞	/ˈd͡ʒɛn.ə.ɹeɪt/	生む, 生み出す
tension 名詞	/ˈtɛnʃən/	緊張, 不安
token 名詞	/ˈtoʊkən/	トークン
efficiency 名詞	/ɪˈfɪʃ.ən.si/	効率性, 効率
extension 名詞	/ɪkˈstɛnʃən/	拡張, 拡大
introduce 動詞	/ˌɪntɹəˈdus/	紹介する, 引き合わせる
implement 動詞	/ˈɪmpləmənt/	実行する, 実現する
lens 名詞	/lɛnz/	レンズ
rope 名詞	/ɹoʊp/	ロープ, 綱
sequence 名詞	/ˈsiː.kwəns/	順序
contribution 名詞	/ˌkɑntɹɪˈbjuʃən/	貢献
explore 動詞	/ɪkˈsploɹ/	探検する
poster 名詞	/ˈpoʊstɚ/	ポスター
lean 動詞	/ˈliːn/	傾ける

この動画の文法

話し手がよく使っている文型を、動画の実際の表現とともに紹介します。

文型	動画での表現
受動態 be + 過去分詞 — 誰がするかより、何が起きるかに焦点を当てる	are restricted · is based · are highlighted
関係詞節 who / which + 節 — 人や物について情報を加える	two, which is · lab, which is

注意したい発音

話し手はdoesn't, I'm, we'llなど、短縮形や弱形を4回使っています。聞こえたとおりの短い形で発音しましょう。

「sh」と「zh」の音: cache /kæʃ/, tension /ˈtɛnʃən/, efficiency /ɪˈfɪʃ.ən.si/, extension /ɪkˈstɛnʃən/, efficient /ɪˈfɪʃənt/
長い単語（アクセントの位置に注意）: efficiency /ɪˈfɪʃ.ən.si/, contribution /ˌkɑntɹɪˈbjuʃən/, automobile /ˈɔː.tə.məˌbil/, potentially /pəˈtɛnʃ(ə)li/, mechanism /ˈmɛk.ə.nɪ.zəm/

日本語話者が苦手な音：

/r/ と /l/ の区別 — /l/ は舌先を歯茎につけ、/r/ はどこにもつけない: linear /ˈlɪn.i.əɹ/, temporal /ˈtɛm.pə.ɹəl/, regardless /ɹɪˈɡɑɹd.lɪs/, explore /ɪkˈsploɹ/, practical /ˈpɹæk.tɪ.kəl/
/v/ — /b/ にならないように、上の歯を下唇に当てる: solve /sɒlv/, discover /dɪˈskʌvə/, aggressive /əˈɡɹɛs.ɪv/, leverage /ˈlɛv.(ə.)ɹɪd͡ʒ/, evolve /ɪˈvɑlv/
/f/ — 「フ」ではなく、上の歯と下唇で出す: efficiency /ɪˈfɪʃ.ən.si/, efficient /ɪˈfɪʃənt/, flash /flæʃ/, fewer /ˈfjuː.ɚ/, affordable /əˈfɔɹ.də.bəl/

この動画での練習方法

まず声を出さずに動画を最後まで聞き、知らない単語をメモします。
通常の速度で一文ずつシャドーイングし、話し手のリズムに合うまで繰り返します。
自分の声を録音して元の音声と比べます。cache, generate, tensionなどの単語に特に注意しましょう。

シャドーイングとは？英語上達に効果的な理由

シャドーイング（Shadowing）は、もともとプロの通訳者養成プログラムで開発された言語学習法で、多言語習得者として知られるDr. Alexander Arguelles によって広く普及されました。方法はシンプルですが非常に効果的：ネイティブスピーカーの英語を聞きながら、1〜2秒の遅延で声に出してすぐに繰り返す——まるで「影（shadow）」のように話者を追いかけます。文法ドリルや受動的なリスニングと異なり、シャドーイングは脳と口の筋肉が同時にリアルタイムで英語を処理・再現することを強制します。研究により、発音精度、抑揚、リズム、連音、リスニング力、そして会話の流暢さが大幅に向上することが確認されています。IELTSスピーキング対策や自然な英語コミュニケーションを目指す方に特におすすめです。

シャドーイングのやり方: ステップ別の完全ガイドを読む →

シャドーイング練習: SANA-Video: Efficient Video Generation with Block Linear Diffusion Transformer, [ICLR 2026, Oral] - 動画で英語スピーキングを学ぶ

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このレッスンの語彙とスピーキングのポイント

この動画の重要語彙

この動画の文法

注意したい発音

この動画での練習方法

シャドーイングとは？英語上達に効果的な理由