Peter van Brick

ミッション1 : 自分の所属する組織をよくすること。ミッション2：世界を小さな問題群に定式化すること。リツイートは同意も不同意も意味しません。興味深いものを備忘録の意味も含めリツイートします。

[Peter van Brick @petervanbrick]

@cqUtM0tL50lUiVw @MDPhD1980 なるほど、言われてみればw
「君たち全員、平均点を越える点をとりなさい！」と全員に言ったら不可能ですね。

[Peter van Brick @petervanbrick]

@maaisecond 東京にいらしたらおごります

[Peter van Brick @petervanbrick]

@jj_oshiro_bot 「情報幾何学の基礎」藤原著、も良い本である

[Peter van Brick @petervanbrick]

@kato80kg @grok 映画のタイトルは？

[Peter van Brick @petervanbrick]

VIVANT はオリジナルな終わり方をしてほしい！オマージュではなく

[Jürgen Schmidhuber @SchmidhuberAI]

Fukushima's video (1986) shows a CNN that recognises handwritten digits [3], three years before LeCun's video (1989).

CNN timeline taken from [5]:

★ 1969: Kunihiko Fukushima published rectified linear units or ReLUs [1] which are now extensively used in CNNs.

★ 1979: Fukushima published the basic CNN architecture with convolution layers and downsampling layers [2]. He called it neocognitron. It was trained by unsupervised learning rules. Compute was 100 times more expensive than in 1989, and a billion times more expensive than today.

★ 1986: Fukushima's video on recognising hand-written digits [3].

★ 1988: Wei Zhang et al had the first "modern" 2-dimensional CNN trained by backpropagation, and also applied it to character recognition [4]. Compute was about 10 million times more expensive than today.

★ 1989-: later work by others [5].

REFERENCES (more in [5])

[1] K. Fukushima (1969). Visual feature extraction by a multilayered network of analog threshold elements. IEEE Transactions on Systems Science and Cybernetics. 5 (4): 322-333. This work introduced rectified linear units or ReLUs, now widely used in CNNs and other neural nets.

[2] K. Fukushima (1979). Neural network model for a mechanism of pattern recognition unaffected by shift in position—Neocognitron. Trans. IECE, vol. J62-A, no. 10, pp. 658-665, 1979. The first deep convolutional neural network architecture, with alternating convolutional layers and downsampling layers. In Japanese. English version: 1980.

[3] Movie produced by K. Fukushima, S. Miyake and T. Ito (NHK Science and Technical Research Laboratories), in 1986. YouTube: https://t.co/MUyH81L5wD

[4] W. Zhang, J. Tanida, K. Itoh, Y. Ichioka. Shift-invariant pattern recognition neural network and its optical architecture. Proc. Annual Conference of the Japan Society of Applied Physics, 1988. First "modern" backpropagation-trained 2-dimensional CNN, applied to character recognition.

[5] J. Schmidhuber (AI Blog, 2025). Who invented convolutional neural networks? https://t.co/chfcmk253b

[Matheorems @matheorems]

A function ℝᵘ→ℝᵛ is rarely linear—yet locally it always is.

The Jacobian packs every first partial into one matrix:

𝐉(𝐱)=[∂fᵢ/∂xⱼ] (v×u)

so f(𝐱+Δ𝐱)≈f(𝐱)+𝐉(𝐱)Δ𝐱.

This matrix drives gradient steps in deep learning, joint-to-end-effector maps in robotics, and volume scaling |det 𝐉| under coordinate change.
Local change, fully captured by derivatives.

[全日本台湾連合会（全台連）／All Japan Taiwanese Union（AJTU） @ajtu_info]

【事務局よりお知らせ】

本日、下記の画像通り「長崎市の台湾代表に対する不当な扱いに断固抗議する」と題した抗議文を発表致しました。

鈴木史朗市長より台湾代表及び台湾国民に対し謝罪を求める。

@Taiwan_in_Japan
@suzuki46genki

[Eric Daugherty @EricLDaugh]

🚨 WOW. This brave Christian migrant from Iran walked up and WENT BERSERK on the proposed Islamic Center in McKinney, TX — straight to the council's face

The whole building ERUPTED after his dire warning:

"I'm a Sharia law survivor from Iran."

"I'm TELLING YOU, this is a BAD idea and you're going to REGRET not listening to people like us who lived under Sharia law!"

"I'm here to tell you this is a DANGEROUS ideology you're allowing in your country. Every country that is Islamic now, it used to be a Christian country and we were soft Christians."

"And we allowed these people to come in, bring their Sharia law into our countries and slowly k*ll us off left and right!"

"Let me make it very clear to you. Christianity is a personal relationship with God...Islam is Sharia law. Religion and state, which is not even compatible with the American thing and when these people will lie to you, to manipulate you."

"Because whenever Islam is little, they will lie to you and tell you they come in peace. This is level one!"

"Level two is what's happening in UK right now, where you have two-tier policing, where you have the blasphemy laws, Islamophobia, racism, all this nonsense that they talk about."

"Any time you criticize Islam, they will use the race card, but every country has this disgusting ideology inside their country, including my own country, Iran, Russia, Islamophobia is another made up bullsh*t because they don't want you to criticize their death cult!"

"If you question that disgusting book, they're get k*lled over it, just like my friends were apostates imprisoned or dead right now in Iran!"

HE NAILED IT!!!

[Peter van Brick @petervanbrick]

@doctor_bru @grok 映画のタイトルは？

[Peter van Brick @petervanbrick]

@maaisecond 謙虚で素晴らしいです！

[Peter van Brick @petervanbrick]

@o_enkelados @Perfect_Insider Gemini に聞いたら、「超過」という言葉が対応するようです。例えば、10超過、10キロ超過、など。数学や日常ではそれほど使いませんね

[Peter van Brick @petervanbrick]

@rshanako 一生懸命授業をやる先生ほど、学生からの変なコメントで傷つくものだと思います。お気になさらないよう。

[Peter van Brick @petervanbrick]

@rshanako 授業評価アンケートで、無記名の自由記述はやめた方がいいです。私もこの仕事をして一年目の時実施しましたが、「○ね」のようなことを書かれました。学生からのハラスメントです

[Code Geek @codek_tv]

A Visualization of Stokes’ Theorem ✍️

[Skidddo @skiiishimm]

@heisHIM3694 There’s no such thing as a “funny” racial slur. Barco can dress it up as banter all he wants, but calling someone a black monkey is pure racism. Bellingham’s reaction was justified.

[Math Files @Math_files]

Mathematics is Not a Spectator Sport

[Peter van Brick @petervanbrick]

懐い

[YouSceneThis? @YouSceneThis]

Lindsay Wagner as Jaime Sommers in The Bionic Woman (1976–1978).