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Tarun 「道」systems & ai
「実験記録」 • FIELD NOTES & PUBLIC NOTEBOOK

Thoughts, systems & orthography.

Documenting everything in the open: daily learning logs across ML & languages, project devlogs, architectural breakdowns, and bite-sized TIL notes.

⚡ FEATURED SPOTLIGHT 「日本語 & 中文」 Jan 18, 2026 • 5 min read

Starting from Zero: Why I'm Learning Japanese and Mandarin Simultaneously

Exploring the cognitive synthesis of dual-orthography immersion, shared kanji/hanzi semantic anchors, and engineering a bidirectional spaced repetition engine for dual language fluency from day one.

日
RADICAL SYNERGIES: 日 (NICHI / RÌ)

Sun, day, everyday diligence. Shared identical stroke sequence across both writing systems anchoring 420+ downstream compounds.

Desk setup with Japanese kanji notebook and tablet
Dual-Engine Spaced Study

All Logs & Field Notes

6 items
Chronological feed (newest first)
Study Journal Feb 28, 2026

The 365-Day Japanese Journey: Day 1 Kickoff

Setting up the daily 90-minute routine, phonetic kana muscle memory, and configuring Anki decks powered by stroke-order mnemonics.

Target: JLPT N2
Mastering Hiragana + Katakana muscle memory
3 min read Read Note →
Daily TIL Feb 22, 2026

Daily TIL: LoRA Rank Trade-offs & FlashAttention Intuitions

Why scaling rank r from 8 to 64 yields diminishing returns on stylistic alignment, but dramatic spikes in memory overhead.

r=16, alpha=32: sweet spot for attention query-key matrices
4 min read Read Note →
What I'm Learning Feb 19, 2026

Chinese Tones Contour Intuition: Singing Pitch Analogy

Treating the four tones as musical vocal warm-up intervals: First (high steady soprano), Second (questioning rise), Third (low dip), Fourth (sharp command).

1: (55) ˉ 2: (35) ˊ 3: (214) ˇ 4: (51) ˋ
3 min read Read Note →
Project Devlog Feb 14, 2026

Building PolyglotLens: From Idea to Working Vision-OCR Model

An end-to-end devlog detailing dataset distillation for historical vertical Japanese scripts and dense handwritten Chinese characters.

OpenCV contouring & glyph bounding normalization
6 min read Read Note →
Project Devlog Feb 10, 2026

Architecting HanziFlow: Fast Local Radicals Storage with SQLite

Storing 214 Kangxi radicals, stroke decompositions, and audio waveforms offline in browser WASM threads.

Zero-latency local-first WASM SQLite storage
5 min read Read Note →
AI & Engineering Feb 04, 2026

Demystifying Small Language Models: What Actually Happens During Fine-Tuning

Peeling back the math of rank-decomposition matrices, low-rank adaptations, gradient flow across frozen weights, and testing local inferences with 1B-3B models.

PEFT gradient flow in 1B-3B parameter regimes
7 min read Read Note →