[G1-Sync] Manual knowledge update

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Antigravity Agent
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id: wiki-2026-0508-iteration
title: Iteration
category: 10_Wiki/Topics
status: needs_review
status: verified
canonical_id: self
aliases: [P-Reinforce-AUTO-ITER-001]
aliases: [Iterative Development, Loop, Iterate]
duplicate_of: none
source_trust_level: A
confidence_score: 0.96
tags: [auto-reinforced, iteration, loops, recursion, computer-science, repetitive-tasks]
confidence_score: 0.9
verification_status: applied
tags: [methodology, agile, python, control-flow, generators]
raw_sources: []
last_reinforced: 2026-04-20
last_reinforced: 2026-05-10
github_commit: pending
inferred_by: Claude Opus 4.7 (auto-normalize 2026-05-08)
tech_stack:
language: python
framework: general
---
# [[Iteration|Iteration]]
# Iteration
## 📌 한 줄 통찰 (The Karpathy Summary)
> "기능의 되풀이, 지능의 축적: 복잡한 작업을 단순한 작은 단계로 나누어 목표를 달성할 때까지 끈질기게 반복 실행함으로써, 단 한 번의 시도로는 불가능한 정교한 결과물을 빚어내는 컴퓨팅적 인내."
## 한 줄
> **"매 small step, 매 feedback, 매 adjust, 매 repeat"**. Iteration 매 dual concept — (1) programming control flow (`for`, `while`, generators) 와 (2) development methodology (small increments + feedback loop). 2026 LLM-assisted 시대 매 iteration 매 even tighter — 매 minute 매 cycle 가능.
## 📖 구조화된 지식 (Synthesized Content)
반복(Iteration)은 동일한 절차를 여러 번 되풀이하는 컴퓨터 과학과 사고의 기본 원리입니다.
## 매 핵심
1. **구현 방식**:
* **Loops**: 정해진 횟수(for)나 조건(while)이 만족될 때까지 코드 블록 실행.
* **Recursion**: 함수가 자기 자신을 호출하여 문제를 작게 쪼개어 해결.
* **Convergence**: 값을 조금씩 수정하며 정답에 수렴함 ([[Gradient-Descent|Gradient-Descent]]와 연결).
2. **왜 중요한가?**:
* 인간은 수백만 번의 반복에 지치지만, 컴퓨터는 지치지 않고 반복하여 압도적인 데이터 처리와 수치 해석을 수행하기 때문임. ([[Efficiency|Efficiency]]와 연결)
### 매 Programming iteration
- **Eager**: `for x in list` — 매 list 매 fully materialized.
- **Lazy**: generator, iterator — 매 on-demand pull.
- **Async**: `async for x in stream` — 매 I/O 의 overlap.
- **Parallel**: `joblib`, `multiprocessing.Pool.imap` — 매 CPU-bound iteration.
## ⚠️ 모순 및 업데이트 (Contradictions & Updates)
- **과거 데이터와의 충돌**: 과거에는 단순히 '횟수 반복 정책'에 그쳤으나, 현대 정책은 반복할 때마다 이전 결과를 학습에 반영하여 더 나아지는 '피드백 기반 반복 정책'으로 지능화됨(RL Update). ([[Feedback-Loops|Feedback-Loops]]와 연결)
- **정책 변화(RL Update)**: 거대 모델의 추론 정책에서 한 번에 답을 내기보다, 여러 번의 생각(Iteration)을 거쳐 정답을 다듬는 '가챠(Sampling)와 재시도 정책'이 성능의 핵심 지표가 됨.
### 매 Methodology iteration
- **Loop**: hypothesis → build → measure → learn.
- **Cadence**: daily (LLM-assisted), weekly (sprint), monthly (release).
- **Artifact per cycle**: shippable increment.
- **Feedback source**: tests, users, metrics, code review.
## 🔗 지식 연결 (Graph)
- [[Feedback-Loops|Feedback-Loops]], [[Gradient-Descent|Gradient-Descent]], [[Efficiency|Efficiency]], [[Incrementalism|Incrementalism]], [[Control-Theory|Control-Theory]]
- **Modern Tech/Tools**: For loops, Multi-pass [[Reasoning|Reasoning]], Iterative [[Refinement|Refinement]], Self-Correction loops.
---
### 매 응용
1. Data pipeline (process N rows lazily).
2. ML hyperparameter search (iteratively narrow).
3. Agile sprint (2-week cycle).
4. LLM agentic loop (think → act → observe → repeat).
## 🤖 LLM 활용 힌트 (How to Use This Knowledge)
## 💻 패턴
**언제 이 지식을 쓰는가:**
- *(TODO)*
### Pattern 1: Generator (lazy iteration)
```python
def read_jsonl(path: str):
"""매 1GB+ file 의 stream — 매 memory O(1)."""
import json
with open(path) as f:
for line in f:
yield json.loads(line)
**언제 쓰면 안 되는가:**
- *(TODO)*
for record in read_jsonl("events.jsonl"):
process(record)
```
## 🧪 검증 상태 (Validation)
### Pattern 2: Itertools combinators
```python
from itertools import islice, chain, groupby, accumulate
- **정보 상태:** needs_review
- **출처 신뢰도:** A
- **검토 이유:** *(P-Reinforce Phase 1 자동 정규화. 본문 검증 필요.)*
# 매 first 100 records 만
head = list(islice(read_jsonl("big.jsonl"), 100))
## 🧬 중복 검사 (Duplicate Check)
# 매 multiple sources 의 concat
combined = chain(read_jsonl("a.jsonl"), read_jsonl("b.jsonl"))
- **기존 유사 문서:** *(TODO: 인덱서 클러스터 리포트 참조)*
- **처리 방식:** UPDATE (자동 정규화)
- **처리 이유:** Phase 1 정규화 — 옛 템플릿/누락 필드 보강.
# 매 group by user
sorted_records = sorted(combined, key=lambda r: r["user_id"])
for user_id, group in groupby(sorted_records, key=lambda r: r["user_id"]):
handle_user(user_id, list(group))
```
## 🕓 변경 이력 (Changelog)
### Pattern 3: Async iteration (2026)
```python
import asyncio
import httpx
| 날짜 | 변경 내용 | 처리 방식 | 신뢰도 |
|------|-----------|-----------|--------|
| 2026-05-08 | P-Reinforce Phase 1 정규화 (frontmatter + 헤더 표준화) | UPDATE | A |
async def fetch_pages(urls: list[str]):
async with httpx.AsyncClient() as client:
async def fetch(url):
r = await client.get(url)
return url, r.text
for coro in asyncio.as_completed([fetch(u) for u in urls]):
yield await coro
async def main():
async for url, html in fetch_pages(URLS):
print(url, len(html))
```
### Pattern 4: Iterative refinement (algorithm)
```python
def newton_sqrt(n: float, tol: float = 1e-10, max_iter: int = 50) -> float:
x = n / 2
for _ in range(max_iter):
x_new = 0.5 * (x + n / x)
if abs(x_new - x) < tol:
return x_new
x = x_new
return x
```
### Pattern 5: LLM agentic loop (2026)
```python
from anthropic import Anthropic
client = Anthropic()
def agent_loop(task: str, max_iter: int = 10):
history = [{"role": "user", "content": task}]
for i in range(max_iter):
msg = client.messages.create(
model="claude-opus-4-7",
max_tokens=4000,
tools=TOOLS,
messages=history,
)
history.append({"role": "assistant", "content": msg.content})
if msg.stop_reason == "end_turn":
return msg
# tool_use → execute → observation → next iter
observations = execute_tools(msg.content)
history.append({"role": "user", "content": observations})
raise RuntimeError("매 max_iter 의 reach")
```
### Pattern 6: Sprint retrospective
```python
def retro(sprint_data: dict) -> dict:
return {
"what_worked": sprint_data["green_items"],
"what_didnt": sprint_data["red_items"],
"experiments_next": [
f"Try {hypothesis}" for hypothesis in sprint_data["new_ideas"]
],
"metrics_delta": {
k: sprint_data["after"][k] - sprint_data["before"][k]
for k in sprint_data["before"]
},
}
```
### Pattern 7: Bounded iteration with timeout
```python
import time
def iterate_with_budget(items, budget_sec: float):
start = time.time()
for item in items:
if time.time() - start > budget_sec:
print(f"매 budget 매 expire — {item} 의 stop")
return
yield process(item)
```
## 매 결정 기준
| 상황 | Approach |
|---|---|
| Large file processing | Generator (lazy). |
| Multiple I/O calls | Async iteration. |
| CPU-bound loop | `multiprocessing` 또는 vectorize. |
| Numerical convergence | While + tolerance check. |
| Product development | 2-week sprint + retrospective. |
| LLM agent | think-act-observe loop with max_iter cap. |
**기본값**: Programming 매 generator-first; methodology 매 1-week iteration with measurable hypothesis.
## 🔗 Graph
- 부모: [[Control-Flow]] · [[Agile]]
- 변형: [[Recursion]] · [[Async-Iteration]] · [[Parallel-Iteration]]
- 응용: [[Generator]] · [[Sprint]] · [[Agentic-Loop]] · [[Newton-Method]]
- Adjacent: [[Itertools]] · [[Coroutine]] · [[Lean-Startup]] · [[Build-Measure-Learn]]
## 🤖 LLM 활용
**언제**: Agentic systems (think-act-observe), iterative refinement of code via LLM feedback, sprint planning summaries.
**언제 X**: Single-shot generation, tasks where each iteration is 1+ hours of human work (cycle too slow).
## ❌ 안티패턴
- **Eager when lazy works**: `list(huge_generator)` — 매 OOM.
- **Unbounded loop**: no max_iter — 매 infinite loop bug.
- **No feedback in iteration**: 매 build without measure — methodology 매 broken.
- **Perfect first iteration**: 매 ship at 70% — feedback 의 wait.
## 🧪 검증 / 중복
- Verified: PEP 234 (iterators), Eric Ries "Lean Startup" (2011), "Continuous Delivery" (Humble & Farley).
- 신뢰도 A.
## 🕓 Changelog
| 날짜 | 변경 |
|---|---|
| 2026-05-08 | Phase 1 |
| 2026-05-10 | Manual cleanup — full content covering both programming and methodology iteration with LLM agentic loop |