pinyu.ai
Writing is how I stop being shaped unconsciously by symbols and begin reshaping them deliberately.
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光会熄灭：马斯克为什么必须建造火星 ✦
一个少年在虚无中找到的答案，如何变成人类文明的备份计划——从存在危机、《基地》、罗马到大过滤器。
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我们活在模拟里吗：一篇论文给出的三选一
马斯克只讲了一半。Bostrom 的原文是一道算术题，它约束的不是现实，而是我们对人类未来的信念。
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How to Read Any Multimodal Architecture Tech
The single cut that explains modern AI diagrams.
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Private Replicas, Identical Updates Tech
A visual explanation of how torchrun, process groups, all_reduce, and PyTorch DDP keep separate worker processes on the same training step.
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Ulysses Sequence Parallelism: A Temporary Change of Layout Tech
Long-context attention works by splitting tokens most of the time, then splitting heads just for attention.
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A practical mental model for CUDA programming Tech
How to map work to threads, reason about memory, and write kernels that make sense
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Modern AI Is a Representation Update Machine Tech
Simple parts, repeated at scale, shaped by data.
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Agent Harness Engineering: The Missing Half of AI Agents Tech
Why better agents come from better systems around models, not just better models
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Your Diffusion Model Has Never Seen a Pixel Tech
What VAEs are really for, and why modern image and video generators still depend on them.
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FlashAttention, Intuitively Tech
Exact Attention Without the Giant Matrix
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How LLMs Actually Work: The Hidden State Is the Story Tech
A visual mental model of Transformers
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Backpropagation as Sensitivity Accounting Tech
The Programmer’s Intuition
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The Phantom Tensor: An Intuitive Guide to Tensor Parallelism in LLMs Tech
Why the massive intermediate tensor in a Transformer MLP never actually exists in your GPU memory.
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LLMs Are Closer to World Models Than Multimodal Models
Perception gives models more world. Language gives them a place to think.
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Why Transformer Blocks Are Built as Residual Updates Tech
A standard Transformer block often looks like this:
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Loss is the price of misplaced belief Tech
A cleaner intuition for cross-entropy in language models
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Power is Rented
Real influence lives in other people's expectations of your future.
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What Normalization Really Removes Tech
Shift, scale, and the unstable coordinate systems inside neural networks
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Ideas Need a Body
Why real understanding is not information transfer, but a temporary change in the person receiving it
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Personality is an attention system
Why MBTI feels compelling, why it is not enough, and what personality is actually doing before you even start thinking
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Success Is a Permission System
Why effort and talent still have to pass through status, signals, and self-protection before they become results
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Good Writing Saves the Reader’s Brain
The deeper lesson behind short sentences, active verbs, and ruthless editing is cognitive design: make the reader spend less energy reconstructing your idea.
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Writing Rewrites Reality
How writing helps us stop being unconsciously shaped by symbols
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Why Organizations Get Stupid
Smart people can see the problem. The organization may still refuse to let it become one.
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Why we need to make things happen ourselves
Meaning begins when time becomes consequence
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People Subscribe to a Promise
Audience growth is expectation training: the repeated confirmation of a clear promise.
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The theory of constraints
most improvement work is pointed at the wrong place
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The Real Meaning of Moving Fast
Speed is not hustle. It is the density of contact with reality.
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AI Makes Expression Cheap. Proof Becomes the Moat.
How AI shifts persuasion from polished expression to verifiable trust
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The Voice in Your Head Is Not the Problem
How Psychological Distance Turns Inner Chatter into Self-Coaching
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The Most Dangerous Place to Start a Business Is the Middle
How premium offers help early businesses survive, learn faster, and scale from strength