Manufacturing Engineer & Data Analyst with 18 years of experience, specializing in data analysis, open source contribution, and business automation. (製造業にて18年の経験を持つエンジニア。データ分析・OSS貢献・業務自動化を専門としています)
2026-06-01時点: 73.0
stackchan-lab — M5 Stack-chan Development Log (Active)
Official M5Stack Stack-chan (M5STACK-K151) moved off its stock cloud assistant onto a self-hosted stack on a Raspberry Pi 5 - 19 server-side tools · 11 device tools over MCP · sings 16 cheer songs · speaks while the model is still writing · stock firmware, unmodified
How the voice loop runs
| Stage | |
|---|---|
| Speech in | sherpa-onnx / ReazonSpeech, on the Pi |
| Reply | hosted 120B model, free tier |
| Speech out | Open JTalk, on the Pi (0.27s per sentence), shaped for a speaker that cannot reproduce bass |
| Tools | weather, FX, indices, crypto, NHK headlines, JMA quake / warning / typhoon, heat index, train delays, on-this-day, moon and sun, fuel surcharge, travel advisories, baseball scores and standings, roster notices, cheer-song lyrics, singing a cheer song |
| Device tools | camera, head angles, LED, volume, screen, battery - called through the same function-call array |
| Interrupting | the device sends no mic while it is playing, so the server stops the audio and listens at a silent point |
| Latency | the reply is spoken sentence by sentence as it streams, and only the utterance that just ended is sent to the recogniser |
What went wrong, and what it turned out to be
| Symptom | Cause |
|---|---|
Pairing failed as No devices found |
Factory firmware nine releases behind. OTA needs Wi-Fi, Wi-Fi setup needs pairing - USB was the only way in |
| Device kept talking to the stock server | A hand-appended NVS entry padded its key with 0xFF instead of 0x00: valid CRC, invisible to my own parser, permanently missed by ESP-IDF |
| OOM-killed at 7GB RSS, twice | A VAD that starts counting at speech never fires on an always-streaming mic |
| Speech played in slow motion | Not length - the same 30 morae read fine as nonsense but break in a real sentence, and one comma puts it right. The server times each synthesis and re-splits what came out slow |
| The tail of every reply dragged | Open JTalk pads ~0.58s of silence after each synthesis - 27-56% of a short reply was silence |
| Speech came out chopped mid-word | The model answered with a comma-less list, so the splitter fell back to counting characters - and its guard protected digits and Latin but not kanji compounds or a number and its unit |
| Asking the prompt to keep replies short | Cost tool calls, 7/9 to 1/9 on the same probe. Shape is enforced in code instead |
| Nothing could interrupt a long answer | The listening window was opened on an estimate of what the device still had buffered, and closed 0.5-1.1s before the device said it had started listening. It waits for that signal now |
| Questions came back as different sentences | The device sends its whole listening buffer - 18s of it around a one-word question - and all of that reached the recogniser. Trimming to the speech and levelling it halved the error rate |
| It sang the cheer songs, and they were unlistenable | Taken out twice. Both times my measurements passed and it still was not a tune, so the bar was wrong rather than the singing |
| The rhythm would not come back, whatever I changed | The wall was the ruler. Against a real recording, comparing sound to sound has a floor of 142-680ms: singing at the onsets of the recording itself, which cannot be wrong as rhythm, still reads that, and every difference I had been reading between methods sat inside it. Measured by times against times, with a random control beside it, the notes now land 20-60ms from the onsets against 55-105ms for random - and it sings |
| Conversation sounded quieter than the singing | Not level - band. The singing voice puts over 90% of its energy above 500Hz; the speaking voice puts 73-84% below it, where a speaker this small reproduces nothing. Matching the level in the band that is actually audible fixed what matching the overall level could not | | Songs from the game score came out with the wrong rhythm | Three faults at once: a beat line grazing a note split it in two, a note crossing a bar line was counted twice, and lyrics were fitted to the whole tune at once so one misread note moved which syllable is held. The score labels its own notes, so counting those against what was read settles each case |
Write-up, measurements and tests: stackchan-lab
M5Stack CoreS3 (ESP32-S3) / Raspberry Pi 5 / Python (aiohttp, WebSocket) / sherpa-onnx + ReazonSpeech / Open JTalk / MCP / Opus
rpi5-infra 🔒 (private, config record)
Configuration record for the Raspberry Pi 5 that hosts the robot's server, kept so the box can be rebuilt after an SD failure and so a change like opening a port leaves a trace.
What it records, and what it deliberately leaves out
| Recorded | firewall rules, systemd units, cron entries, listening ports, an inventory of what is actually running |
| Left out | secrets - unit files reference their EnvironmentFile without containing values, and credential files are excluded |
Raspberry Pi OS / systemd / ufw / cron / Tailscale
Minami Baseball OB — Alumni Association Site (In Production)
Full-stack web app for a high school baseball alumni association — 11 active users · 44 pages · 23 DB tables · 19 e2e tests · ¥0/mo running cost (156 files, ~18200 LOC). Technical Documentation
| PC (Light) | Game Results |
5-tier RBAC (Middleware + RLS), automated member pipeline (Form → GAS → Actions → Supabase), 681 match records (1955–present)
Architecture & features
- 5-tier RBAC (guest → admin): Next.js Middleware + Supabase RLS — authorization at route, row, and component level
- Automated member pipeline: Google Form → Apps Script → GitHub Actions auto-PR → Supabase role sync. Personal names never touch Git
- Custom CMS: 9 editor pages + 5 inline edit, soft delete (7-day trash + auto-purge), change history, audit logs
- 681 match records (1955–present): cross-source verification, generation-based grouping, per-game photo management
- UX: Unsaved warning, Web Share + LINE fallback, Calendar registration, ripple feedback, Suspense skeleton UI, weather forecast (Open-Meteo, 10 venues), automated game detection (2 sources → auto-PR)
- Security: RLS on all 22 tables (16 main + 6 history),
server-onlyadmin, CODEOWNERS, branch protection, secret scanning, cookie consent, 60-min session timeout - Silent-fail monitoring — built after a 1-month silent outage (a Form trigger silently lost its OAuth grant):
- Hourly health-check probes the full member-request + feedback pipeline (Vercel proxy / dispatch chain / GAS time trigger / gas-issue-form secret match / role-sync recency)
- Workflow-run failure + sync-roles liveness (cron-stall) detection auto-opens a tracking GitHub issue and auto-closes it on recovery
- Dual-channel alerts: GitHub Actions email + GAS Gmail
Next.js 15 / TypeScript 5.8 / Tailwind CSS 4 / Supabase (PostgreSQL + Auth + Storage) / Vercel / GitHub Actions / Google Apps Script / GA4
Yokohama Funnies — Amateur Baseball Team Site (In Production)
Companion site for an amateur baseball team, forked from Minami Baseball OB — 23-player roster · 48 pages · 31 DB tables · 18 e2e tests · ¥0/mo running cost (165 files, ~19600 LOC). Technical Documentation
5-tier RBAC (Middleware + RLS), PR-based member approval (Form → GAS → Actions auto-PR → merge → role sync), custom amateur-baseball stats schema (per-game batting / pitching / attendance) with manual-input + spreadsheet-migration ingestion
Architecture & features
- 5-tier RBAC (guest → admin): Next.js Middleware + Supabase RLS — authorization at route, row, and component level (Google OAuth)
- PR-based member approval (same topology as Minami): Google Form → Apps Script → Vercel proxy → GitHub App auto-creates an approval PR adding a per-member role file (
config/members/<uid>.yml); merging triggers a polling role-sync to Supabase + an approval email to the member — approve by merge. Personal data stays minimal in Git - Amateur-baseball stats schema:
players(jersey / bats / throws / is_guest / photo / comment), per-gamegame_player_batting(14 cols) +game_player_pitching,attendances(○/△/×); aggregated views + client-side season filter compute 打率 / 出塁率 / 長打率 / OPS / ERA / WHIP / K9 - Stat ingestion: spreadsheet migration + editor manual-input UI (
/edit/game-stats, scorebook image side-by-side + per-player grid); editors upload scorebook images straight from the result page - Custom CMS / UX: dedicated + inline editor pages, soft delete (7-day trash + auto-purge), change history, audit logs, public No. 06 ROSTER section (photo + jersey + role + comment) via
players_publicview, Open-Meteo weather forecast with WBGT heat-stress display - Security: Supabase RLS on all tables, anon-readable roster view with sensitive columns filtered, server-only admin, gitleaks secret scanning, notifications isolated on a separate public Actions repo
- Silent-fail monitoring:
- Hourly health-check probes every notification path (Vercel proxy / dispatch ack / GAS heartbeat / feedback webhook secret)
- Workflow-run failure + sync-roles liveness detection auto-opens/closes a GitHub issue, with email alerts on any silent failure
Next.js 15 / TypeScript 5.8 / Tailwind CSS 4 / Supabase / Vercel / GitHub Actions / Google Apps Script
| Japan Geohazard Monitor | Persian Gulf Ship Tracker |
| 31 geophysical data sources → ML earthquake prediction (walk-forward AUC ~0.80 via ConvLSTM, CSEP Molchan 0.981) + real-time monitoring dashboard | AIS vessel tracking across the Persian Gulf & Gulf of Oman with land mask filtering 🛑 Stopped — RPi5 SSD failure (2026-05-16). |
Real-time API / WebSocket → SQLite → FastAPI + Leaflet.js (dark theme) — All projects
Japan Geohazard Monitor — Earthquake prediction research
Data sources, evaluation and the Kumamoto InSAR result
- 85 features from 25+ sources — USGS, NASA Earthdata, INTERMAGNET, NMDB, NOAA, IOC
- Walk-forward evaluation — HistGBT + elastic-net + ConvLSTM, best walk-forward AUC ~0.80 (Kaggle T4)
- Open data & automation — features published as a public Hugging Face dataset, weekly CI pipeline on GitHub Actions
- Co-seismic InSAR — 2026 Kumamoto M7.1 measured from open Sentinel-1 on ASF HyP3: line-of-sight displacement −21.7 to +15.0 cm and a coherence-change damage proxy (method, figures and caveats)
| Project | Description | Demo |
|---|---|---|
| NPB Season Prediction | Bayesian ensemble (Marcel 35% + Stan/Ridge 40% + ML 25%) + Monte Carlo team simulation + 24 foreign player individual projections | Live |
| NPB 2021 Backtest | Could Bayesian model predict Yakult & Orix last→champion? 25 foreign players with FanGraphs data | Analysis |
| MLB Win Probability Engine | 3-engine ensemble WP (Normal + Empirical + LightGBM) + Gemini AI commentary | Live |
| Baseball MLOps Pipeline | Statcast MLOps: 5-model ensemble — weekly auto-retrain paused (BigQuery retired 2026-04, data layer being rebuilt on Hugging Face) | Live |
| MLB Data Pipeline | Shared data platform — FanGraphs + Savant + Statcast published as a public Hugging Face dataset, weekly auto-refresh via GitHub Actions | HF Dataset |
Prediction accuracy & details
| System | Key Metric | Articles |
|---|---|---|
| NPB 2026 | 8-yr backtest wOBA MAE .0498, 97% prob. of beating Marcel. 10K Monte Carlo sims | JP / EN |
| NPB 2021 Backtest | MAE 10.7W — Yakult & Orix last→champion driven by JP player breakouts, not foreign players | Repo |
| MLB WP Engine | 3-engine ensemble, 367K+ play states (2015–2024), inverse-Brier weighted + Isotonic calibration | Live |
| Baseball MLOps | Batter wOBA MAE .0287 (Marcel: .0326) / Pitcher xFIP MAE 0.483 (Marcel: 0.558) | Live |
Baseball Skeleton Analysis — 3D skeleton visualization from Driveline OpenBiomechanics C3D data
| Pitching Skeleton (3D C3D) | Hitting Skeleton (3D C3D) |
Trunk rotation range vs pitch speed: r=0.425 (strongest). Contributed bug fix PR #384 to ezc3d. Article (JP) / Article (EN)
Handwritten Scorebook OCR 🔒 (private R&D, active)
Amateur Baseball Scorebook Reader — reads handwritten Japanese paper scorebooks (紙スコアブック) from photos into structured at-bat data. 76% → 93% on the hardest mark class, evaluated on 29 hand-transcribed ground-truth sheets.
How it reads the sheets, and how it is evaluated
- No paid APIs, no cloud OCR — deterministic computer vision (OpenCV on a Raspberry Pi 5)
- Game-logic constraint solver — only accepts readings consistent with legal base-running; fused with template matching it lifted the hardest mark class from 76% to 93% pooled
- Honest, live evaluation — the ground-truth archive is complete and still growing (the latest game was transcribed the day it was played); every new sheet serves as a held-out generalization test before joining the pool — 27 consecutive held-out sheets so far, some read perfectly
- Real output — my team's 2026 season batting stats are compiled from this ground truth
Private repo (the method is the product) — public technical write-up: baseball-scorebook-ocr-docs (JP)
6 analyses covering Japanese MLB pitchers and Ohtani batting data.All analyses (6)
| Analysis | Key Finding | Article |
|---|---|---|
| Kikuchi Slider Revolution (2019-2025) | SL 17%→37% after Astros trade | Zenn / DEV.to / Kaggle |
| Senga Ghost Fork (2023-2025) | FO whiff rate 58%→39%, decline pre-injury | Zenn / DEV.to / Kaggle |
| Imanaga 2nd Year (2024-2025) | 3-pitch concentration (97%), 1st TTO xwOBA .505 | Zenn / DEV.to / Kaggle |
| Darvish Evolution (2021-2025) | SL/ST halved, CU became putaway pitch | Zenn / DEV.to / Kaggle |
| Ohtani Spray Chart | spraychart() one-liner vs matplotlib manual | Zenn |
| Ohtani Heatmap | Stadium drawing + hit density heatmap | Zenn |
(98 PRs / 53 Merged) across 46 repositories. See [oss-contributions](https://github.com/yasumorishima/oss-contributions) for full details.
PR highlights (click to expand)
| Repository | PR | Description |
|---|---|---|
| dfinity/icp-js-core | #1270 | Improve Candid decode error messages |
| line/line-bot-mcp-server | #369 | Add get_follower_ids tool |
| pyomeca/ezc3d | #384 | Fix __eq__ early return bug |
| codeforjapan/mapprint | #556 | Share buttons on the disaster print map |
| codeforjapan/mapprint | #564 | Deterministic list order on the printable map |
| codeforjapan/mapprint | #563 | 2026 Kumamoto earthquake paper map |
| codeforjapan/BirdXplorer | #281 | Statement timeouts for the Community Notes API |
| hotosm/openaerialmap | #289 | Stop the STAC ingester dropping the wrong record when an entry fails |
| apache/fineract-backoffice-ui | #321 | Translate the accounting screen titles and tooltips |
| daisy/MathCAT | #665 | Fix chemistry assertions that could never fail |
| PHPOffice/PHPPresentation | #897 | Fix PHP 8.4/8.5 static analysis by fixing 144 findings instead of ignoring them |
| project-inclusive/OpenFisca-Japan | #479 | Add the vocational training benefit for single-parent families to Japan's welfare rules engine |
| project-inclusive/OpenFisca-Japan | #480 | Add the housing security benefit to Japan's welfare rules engine |
| project-inclusive/OpenFisca-Japan | #481 | Add the welfare loan fund for single-parent families and widows to Japan's welfare rules engine |
| project-inclusive/OpenFisca-Japan | #482 | Add the school-cost assistance eligibility check to Japan's welfare rules engine |
| project-inclusive/OpenFisca-Japan | #483 | Add the higher-education tuition and entrance-fee reduction to Japan's welfare rules engine |
| optuna/optuna | — | Hyperparameter optimization framework |
| pandas-dev/pandas | — | Data analysis library |
| jldbc/pybaseball | #498-504 | Bug fixes & documentation |
team-mirai — Civic Tech OSS (26 PRs (14 Merged / 4 Open / 8 Closed))
Civic tech projects for political transparency & citizen participation in Japan. Next.js / TypeScript / Supabase / Vitest.
| Repository | Highlights |
|---|---|
| action-board | 48 unit tests, RPC tests, breadcrumb nav, cache fix + 5 more |
| mirai-gikai | Supabase CLI v2.106 seed permission fix, Safari/iOS ruby spacing fix |
| fact-checker | X API investigation + 5 PRs |
Notebooks Expert | 🥉 14 Bronze Notebook Medals
Active:
- ROGII Wellbore Geology Prediction — $50K, wellbore TVT regression (public LB 7.311, rank 1406/5063)
- SIGNATE AI Engineering Challenge — NTT Data, LLM / RAG / agentic retrieval over a messy corporate drive (¥1.2M prize pool, Jul–Aug 2026)
- SIGNATE NEDO Challenge — Baggage-Loading Optimization — 3D bin packing for airline ULD containers, hybrid offline+online packing agent (¥15M prize pool, Jul–Oct 2026)
Finished 2026: Playground Series S6E6 - Stellar Classification (macro-F1, private LB 0.95939) · NIR Moisture Prediction (SIGNATE, wood spectroscopy) · Stanford RNA 3D Folding 2 · BirdCLEF+ 2026
Bronze Medal Notebooks (14)
| Notebook | Topic |
|---|---|
| savant-extras Defense & Pitching Quality | Defense metrics & pitching quality (savant-extras) |
| MLB Statcast Spray Charts for WBC 2026 | WBC 2026 spray + pitch zone charts (baseball-field-viz) |
| March Machine Learning Mania 2026 | NCAA tournament prediction (LightGBM) |
| NFL Geometric Rules Baseline | Physics-based rules, No ML, RMSE 2.921 |
| CAFA 6 Baseline | Protein function prediction (PyTorch MLP) |
| Dataset | Description |
|---|---|
| 🥈 MLB Bat Tracking Leaderboard (2024-2025) | 452 batters, 19 swing metrics |
| 🥈 WBC 2026 Scouting | 306 players, 20 countries |
Other datasets (4)
| Dataset | Description |
|---|---|
| Baseball Savant Leaderboards (2024-2025) | 15 leaderboards, 2 seasons combined |
| Japanese MLB Players Statcast (2015-2025) | 34 Japanese MLB players, 174k pitches+hits |
| MLB Pitcher Arsenal Evolution (2020-2025) | 4,253 pitcher-seasons, 111 metrics |
| MLB Statcast + Bat Tracking (2024-2025) | Combined Statcast + bat tracking data |
DrivenData Competitions — Automated pipeline: GitHub Actions + GPU training + GPU→CPU fallback. Most recently competed in On Top of Pasketti (Children's ASR, $120K prize, Wav2Vec2 CTC; submission deadline 2026-04-06).
| App | Description | Link |
|---|---|---|
| MLB Bat Tracking Dashboard | Leaderboard, Player Comparison, Team Lineup Builder. Powered by savant-extras | Live |
| WBC 2026 Scouting Dashboard | 30 Statcast apps across 19 countries. Zone heatmaps, spray charts, pitch movement | Live |
| Daily Diary | Flutter mobile app, 10 languages, offline-first, biometric app lock, daily reminder, Android Auto Backup, AdMob | Google Play |
| Fire Tablet Google Play Helper | Detects Fire OS from the browser UA, then lists the four required APKs in install order with step gating and saved progress | Live |
WBC 2026 Scouting Dashboard details (30 apps)
30 Statcast scouting apps across 19 countries (batters + pitchers). Zone heatmaps, spray charts, pitch movement, LHP/RHP splits. Auto-fetched via GitHub Actions. → USA Batters / Japan Pitchers / All 30 apps
6 packages (click to expand)
| Package | Description |
|---|---|
| savant-extras | 17 Baseball Savant leaderboards + date range support. Complements pybaseball |
| baseball-field-viz | Statcast coordinate transform + field drawing + spray charts + pitch zone charts |
| kaggle-notebook-deploy | Deploy Kaggle Notebooks via git push + GitHub Actions |
| kaggle-wandb-sync | Sync W&B offline runs from Kaggle to W&B cloud |
| signate-deploy | SIGNATE competition workflow via GitHub Actions |
| signate-wandb-sync | Record SIGNATE scores to W&B runs |
| Project | Description |
|---|---|
| Kimaru | Tamper-evident scheduling polls, fully on-chain on the Internet Computer (Motoko + asset canister, 12 languages, no login) — Live |
| OpenClaw Twitter Bot | Raspberry Pi 5 + OpenClaw + Gemini API auto-tweet bot (stopped) — Article (JP) |
| alexa-rpi5 🔒 | RPi5 ↔ Fire TV Cube 操作 hub (Echo speaker 不要環境)。 cube wrapper + watchers + integrations、 機能詳細は repo README 参照 |
Past Projects
| Project | Description |
|---|---|
| GAS Calendar Tool | Batch calendar event registration with senior-friendly mobile UI |
| Dune Analytics | On-chain data analysis — JPYC Stablecoin Dashboard |
| selenium-to-playwright 🔒 | Playwright browser automation: 20+ scripts + night batch runner with auto GitHub Issues |
| Archived Projects | Selenium automation, business workflow tools, etc. |
| Category | Technologies |
|---|---|
| Data Analysis & ML | Python, pandas, scikit-learn, LightGBM, XGBoost, CatBoost, PyTorch, matplotlib, seaborn, DuckDB, W&B |
| Data Platform | Hugging Face Datasets (MLB / NPB / geohazard — public, auto-refreshed via GitHub Actions), SQLite, |
| Data Sources | Baseball Savant (Statcast), pybaseball, USGS, NASA Earthdata, AIS |
| Web & Dashboards | Streamlit, Next.js, TypeScript, Supabase, Vercel, shadcn/ui |
| Mobile App | Flutter, Dart, Hive, Google AdMob |
| Automation & DevOps | GitHub Actions, Google Apps Script, VBA, Power Query |
| Tools | Claude Code, Kaggle, Google Colab, Excel, Looker Studio |
| Manufacturing | Statistical Quality Control, Process Engineering |
- 2024 - Present: Quality Management @ Marubun Corporation (丸文株式会社)
- 2008 - 2024: Semiconductor Manufacturing Process Engineer (半導体製造プロセスエンジニア)
Stencil mask and manufacturing method thereof (ステンシルマスク及びその製造方法)
- Patent No: 6307851 (特許第6307851号)
- Role: Inventor (発明者)
- Assignee: Toppan Printing Co., Ltd. (凸版印刷株式会社)
- Link: Google Patents (JP6307851B2)
- Site: https://yasumorishima.github.io — tools and blog hosted on this domain
- Blog: DEV.to (EN) / Zenn (JP) / Quarto Blog (EN)
- Kaggle: https://www.kaggle.com/yasunorim
- Wantedly: https://www.wantedly.com/id/yasunori_morishima_b
- LinkedIn: https://www.linkedin.com/in/morishima-yasunori-b70229241