Posts
All the articles I've posted.
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Quant Study 00 — pandas Basics · Trend Following vs Mean Reversion · The 4 Backtest Biases · Fake Alpha
Starting a quant learning series. pandas Series/DataFrame, loc/iloc, the warm-up period (NaN), silent data corruption from adjusted close prices, trend following (MA, golden/dead cross) vs mean reversion, the 4 backtest biases (look-ahead, overfitting, unrealistic trading costs, survivorship bias), and why you need to look at a distribution instead of a single point to filter out fake alpha (B&H beat rate / median alpha / market exposure / walk-forward).
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The Day Claude Code Suddenly Stopped Working — the 529 Overloaded Error and the Existence of status.claude.com
I turned on Claude Code in the morning as usual, but agent calls kept failing with a 'server overloaded' error. A short troubleshooting log tracking down the cause through API Docs, a developer group chat, and status.claude.com — turned out to be a temporary overload on Anthropic's server side.
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LangGraph Study Log #2 — Extending State + Dynamic System Prompts + Chatbot (and the Truth Behind 'AI Remembers')
I extended State beyond just messages to include user name, tool call count, and session start time, then used that State to dynamically build the system prompt. Along the way, building a chatbot led me to the real revelation of the day: what 'memory' actually is.
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LangGraph Study Log #1 — My First Graph + Why State Confused Me
Starting LangGraph, one of the study candidates I had noted down. Building nodes, edges, conditional branches, and loops with StateGraph was more intuitive than expected, but the term 'State' didn't click for a while. I finally settled on it by comparing it to a game character's inventory and HP.