diff --git a/compare.ts b/.old/compare.ts
similarity index 100%
rename from compare.ts
rename to .old/compare.ts
diff --git a/script/extract.ts b/.old/extract.ts
similarity index 100%
rename from script/extract.ts
rename to .old/extract.ts
diff --git a/predict-all.ts b/.old/predict-all.ts
similarity index 100%
rename from predict-all.ts
rename to .old/predict-all.ts
diff --git a/predict.sh b/.old/predict.sh
similarity index 100%
rename from predict.sh
rename to .old/predict.sh
diff --git a/script/predict.ts b/.old/predict.ts
similarity index 100%
rename from script/predict.ts
rename to .old/predict.ts
diff --git a/spec.md b/.old/spec.md
similarity index 100%
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diff --git a/t.sh b/.old/t.sh
similarity index 100%
rename from t.sh
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diff --git a/test/compare.json b/.old/test/compare.json
similarity index 100%
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diff --git a/test/factors.json b/.old/test/factors.json
similarity index 100%
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diff --git a/test/model.pth b/.old/test/model.pth
similarity index 100%
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diff --git a/test/result.json b/.old/test/result.json
similarity index 100%
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diff --git a/test/scaler.json b/.old/test/scaler.json
similarity index 100%
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diff --git a/test/validate_result_1.csv b/.old/test/validate_result_1.csv
similarity index 100%
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diff --git a/test/validate_result_10.csv b/.old/test/validate_result_10.csv
similarity index 100%
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diff --git a/test/validate_result_2.csv b/.old/test/validate_result_2.csv
similarity index 100%
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diff --git a/test/validate_result_3.csv b/.old/test/validate_result_3.csv
similarity index 100%
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diff --git a/test/validate_result_4.csv b/.old/test/validate_result_4.csv
similarity index 100%
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diff --git a/test/validate_result_5.csv b/.old/test/validate_result_5.csv
similarity index 100%
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diff --git a/test/validate_result_6.csv b/.old/test/validate_result_6.csv
similarity index 100%
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diff --git a/test/validate_result_7.csv b/.old/test/validate_result_7.csv
similarity index 100%
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diff --git a/test/validate_result_8.csv b/.old/test/validate_result_8.csv
similarity index 100%
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diff --git a/test/validate_result_9.csv b/.old/test/validate_result_9.csv
similarity index 100%
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diff --git a/script/train.py b/.old/train.py
similarity index 100%
rename from script/train.py
rename to .old/train.py
diff --git a/train.sh b/.old/train.sh
similarity index 100%
rename from train.sh
rename to .old/train.sh
diff --git a/script/train.ts b/.old/train.ts
similarity index 100%
rename from script/train.ts
rename to .old/train.ts
diff --git a/bun.lock b/bun.lock
index 285f7af..4ef8732 100644
--- a/bun.lock
+++ b/bun.lock
@@ -8,6 +8,7 @@
         "tja-parser": "^0.2.9",
       },
       "devDependencies": {
+        "@types/bun": "^1.3.13",
         "@types/iconv-lite": "^0.0.1",
         "@types/node": "^25.6.0",
         "typescript": "^6.0.3",
@@ -17,10 +18,14 @@
   "packages": {
     "@babel/runtime": ["@babel/runtime@7.29.2", "", {}, "sha512-JiDShH45zKHWyGe4ZNVRrCjBz8Nh9TMmZG1kh4QTK8hCBTWBi8Da+i7s1fJw7/lYpM4ccepSNfqzZ/QvABBi5g=="],
 
+    "@types/bun": ["@types/bun@1.3.13", "", { "dependencies": { "bun-types": "1.3.13" } }, "sha512-9fqXWk5YIHGGnUau9TEi+qdlTYDAnOj+xLCmSTwXfAIqXr2x4tytJb43E9uCvt09zJURKXwAtkoH4nLQfzeTXw=="],
+
     "@types/iconv-lite": ["@types/iconv-lite@0.0.1", "", { "dependencies": { "@types/node": "*" } }, "sha512-SsRBQxGw7/2/NxYJfBdiUx5a7Ms/voaUhOO9u2y9FTeTNBO1PXohzE4i3JfD8q2Te42HLTn5pyZtDf8j1bPKgQ=="],
 
     "@types/node": ["@types/node@25.6.0", "", { "dependencies": { "undici-types": "~7.19.0" } }, "sha512-+qIYRKdNYJwY3vRCZMdJbPLJAtGjQBudzZzdzwQYkEPQd+PJGixUL5QfvCLDaULoLv+RhT3LDkwEfKaAkgSmNQ=="],
 
+    "bun-types": ["bun-types@1.3.13", "", { "dependencies": { "@types/node": "*" } }, "sha512-QXKeHLlOLqQX9LgYaHJfzdBaV21T63HhFJnvuRCcjZiaUDpbs5ED1MgxbMra71CsryN/1dAoXuJJJwIv/2drVA=="],
+
     "complex.js": ["complex.js@2.4.3", "", {}, "sha512-UrQVSUur14tNX6tiP4y8T4w4FeJAX3bi2cIv0pu/DTLFNxoq7z2Yh83Vfzztj6Px3X/lubqQ9IrPp7Bpn6p4MQ=="],
 
     "csv-parse": ["csv-parse@6.2.1", "", {}, "sha512-LRLMV+UCyfMokp8Wb411duBf1gaBKJfOfBWU9eHMJ+b+cJYZsNu3AFmjJf3+yPGd59Exz1TsMjaSFyxnYB9+IQ=="],
diff --git a/docs/1. tja factorize.md b/docs/1. tja factorize.md
new file mode 100644
index 0000000..42946a6
--- /dev/null
+++ b/docs/1. tja factorize.md	
@@ -0,0 +1,12 @@
+# TJA factorize
+TJA를 DNN에 사용하기 위해 factorize한다.
+
+각 노트를 다음과 같이 변환한다.
+- [Note type, BPM, Scroll, Timing]
+- Note type은 0과 1만 사용한다.
+    - Don -> 0
+    - Ka -> 1
+- BPM은 100을 나누어 사용한다.
+- Scroll은 5를 나누어 사용한다.
+- Timing은 이전 노트와의 시간 차이를 사용한다. (단위 s)
+
diff --git a/docs/2. features.md b/docs/2. features.md
new file mode 100644
index 0000000..be3e058
--- /dev/null
+++ b/docs/2. features.md	
@@ -0,0 +1,40 @@
+# Feature
+DNN 분석을 위해 채보의 특성을 추출한다.
+
+## Average density
+평균 밀도를 나타낸다.
+
+$\frac{노트 수}{마지막 노트 타이밍 - 첫 노트 타이밍}$
+
+## Peak density
+최고 밀도를 나타낸다.
+
+어떤 노트를 기준으로 앞으로 1초내에 있는 노트들의 개수 중 최대값으로 구한다.
+
+## Average BPM
+평균 BPM을 나타낸다.
+
+$\frac{\Sigma BPM}{노트 수}$
+
+## Average BPM 2
+평균 BPM을 나타내나, 다른 방식으로 구한다.
+극소수의 노트만 BPM이 다를 경우 평균 BPM에 미치는 영향이 클 수 있기 때문에, BPM의 제곱을 총합하여 평균을 구한다.
+
+$\sqrt{\frac{\Sigma BPM^2}{노트수}}$
+
+## BPM Change
+BPM 변화 횟수를 나타낸다. BPM 흔들림을 제외하기 위해, 이전 노트와의 BPM차이가 1.5 이상일 떄 1 증가한다.
+
+## Scroll Change
+스크롤 변화 횟수를 나타낸다. 노트의 $BPM \times Scroll$의 값이 이전 노트와 1.5 이상 차이날 때 1 증가한다.
+
+## Rhythm Complexity
+i번째 노트와 i-1번쨰 노트의 간격이 i-1번쨰 노트와 i-2번째 노트의 간격의 비율이 2의 거듭제곱이 아닐 때 1 증가한다.
+
+## Color Complexity
+i번째 노트와 i-2번쨰 노트가 다른 종류일 때 증가하며, 간격의 제곱의 역수에 비례한다.
+
+$\frac{\mathrm{color\ changed\ ?\ 1\ :\ 0}}{\Delta t^2}$
+
+## Note Count
+노트의 개수
\ No newline at end of file
diff --git a/package.json b/package.json
index b216a5e..1c8216f 100644
--- a/package.json
+++ b/package.json
@@ -5,6 +5,7 @@
     "tja-parser": "^0.2.9"
   },
   "devDependencies": {
+    "@types/bun": "^1.3.13",
     "@types/iconv-lite": "^0.0.1",
     "@types/node": "^25.6.0",
     "typescript": "^6.0.3"
diff --git a/predict/predict_xgboost.py b/predict/predict_xgboost.py
new file mode 100644
index 0000000..9d1a21a
--- /dev/null
+++ b/predict/predict_xgboost.py
@@ -0,0 +1,155 @@
+import argparse
+import json
+import math
+import os
+import joblib
+import numpy as np
+
+
+# =========================================================
+# 파일명
+# =========================================================
+
+FEATURES_FILENAME = "features.json"
+
+MODEL_FILENAME = "model.pkl"
+SCALER_FILENAME = "scaler.pkl"
+FEATURE_NAMES_FILENAME = "features.txt"
+
+
+# =========================================================
+# safe float
+# =========================================================
+
+def safe_float(value):
+    if value is None:
+        return 0.0
+
+    x = float(value)
+
+    if not math.isfinite(x):
+        return 0.0
+
+    return x
+
+
+# =========================================================
+# 예측 함수
+# =========================================================
+
+def predict(
+    working_dir: str,
+    songno: str
+):
+    # =====================================================
+    # 경로
+    # =====================================================
+
+    features_path = os.path.join(
+        working_dir,
+        FEATURES_FILENAME
+    )
+
+    model_path = os.path.join(
+        working_dir,
+        MODEL_FILENAME
+    )
+
+    scaler_path = os.path.join(
+        working_dir,
+        SCALER_FILENAME
+    )
+
+    feature_names_path = os.path.join(
+        working_dir,
+        FEATURE_NAMES_FILENAME
+    )
+
+    # =====================================================
+    # 모델 로드
+    # =====================================================
+
+    model = joblib.load(model_path)
+    scaler = joblib.load(scaler_path)
+
+    # =====================================================
+    # feature 이름 로드
+    # =====================================================
+
+    with open(feature_names_path, "r", encoding="utf-8") as f:
+        feature_names = [
+            line.strip()
+            for line in f.readlines()
+            if line.strip()
+        ]
+
+    # =====================================================
+    # features.json 로드
+    # =====================================================
+
+    with open(features_path, "r", encoding="utf-8") as f:
+        data = json.load(f)
+
+    # =====================================================
+    # target 찾기
+    # =====================================================
+
+    targets = []
+
+    for item in data:
+        if str(item["songno"]) == str(songno):
+            targets.append(item)
+
+    if len(targets) == 0:
+        raise ValueError(f"Chart not found: songno={songno}")
+
+    # =====================================================
+    # feature vector 생성
+    # =====================================================
+
+    row = []
+
+    for target in targets:
+        row = []
+
+        for k in feature_names:
+            value = target.get(k, 0)
+            row.append(safe_float(value))
+
+        X = np.array([row], dtype=np.float32)
+
+        X = scaler.transform(X)
+
+        pred = model.predict(X)[0]
+
+        diff = target.get("difficulty", "unknown")
+
+        print(
+            f"{diff:10} "
+            f"{pred:.1f}"
+        )
+
+
+# =========================================================
+# main
+# =========================================================
+
+if __name__ == "__main__":
+    parser = argparse.ArgumentParser()
+
+    parser.add_argument(
+        "--workingDir",
+        required=True
+    )
+
+    parser.add_argument(
+        "--songno",
+        required=True
+    )
+
+    args = parser.parse_args()
+
+    predict(
+        args.workingDir,
+        args.songno
+    )
\ No newline at end of file
diff --git a/preprocess/factorize.ts b/preprocess/factorize.ts
new file mode 100644
index 0000000..b919ac6
--- /dev/null
+++ b/preprocess/factorize.ts
@@ -0,0 +1,18 @@
+import { Course } from "tja-parser";
+import { filterHitNotes } from "./util";
+
+export type NoteFactor = [type: 0 | 1, bpm: number, scroll: number, delta: number]
+export function factorize(course: Course) {
+    const hitNotes = filterHitNotes(course);
+    const factors: NoteFactor[] = [];
+    for (let i = 0; i < hitNotes.length; i++) {
+        const note = hitNotes[i];
+        factors.push([
+            (note.type === 1 || note.type === 3) ? 0 : 1,
+            note.getBPM() / 100,
+            note.getScroll() / 5,
+            i === 0 ? 0 : (note.getTimingMS() - hitNotes[i - 1].getTimingMS()) / 1000
+        ])
+    }
+    return factors;
+}
\ No newline at end of file
diff --git a/script/factorize.ts b/preprocess/featurize.ts
similarity index 66%
rename from script/factorize.ts
rename to preprocess/featurize.ts
index b3b83ab..5f8938b 100644
--- a/script/factorize.ts
+++ b/preprocess/featurize.ts
@@ -1,6 +1,6 @@
 import { Course, Bar, Note, HitNote } from 'tja-parser';
 
-export namespace Factor {
+export namespace Feature {
     export function filterHitNotes(course: Course) {
         const notes: HitNote[] = [];
         course.noteGroups.forEach((g) => {
@@ -31,6 +31,9 @@ export namespace Factor {
 
     // 밀도 관련
     export function getAverageDensity(notes: HitNote[]) {
+        if (notes.length === 0) {
+            return 0;
+        }
         return notes.length / (notes[notes.length - 1].getTimingMS() - notes[0].getTimingMS()) * 1000
     }
 
@@ -50,7 +53,7 @@ export namespace Factor {
 
     // BPM 관련
     export function getAverageBPM(notes: HitNote[]) {
-
+        if(notes.length === 0) return 0;
         const averageBPM = notes.reduce((p, note) => p + note.getBPM().valueOf(), 0) / notes.length;
         return averageBPM;
     }
@@ -65,29 +68,6 @@ export namespace Factor {
         return bpmChange;
     }
 
-    // 복잡성
-    export function getComplexity(notes: HitNote[]) {
-        let complexity = 0;
-        for (let i = 2; i < notes.length; i++) {
-            let localComplexity = 0;
-
-            // ddk 또는 dkk류면 1, 아니면 0.5
-            if (
-                (notes[i].type % 2 === notes[i - 1].type % 2 && notes[i - 1].type % 2 !== notes[i - 2].type % 2) ||
-                (notes[i].type % 2 !== notes[i - 1].type % 2 && notes[i - 1].type % 2 === notes[i - 2].type % 2)
-            ) {
-                localComplexity = 1;
-            } else {
-                localComplexity = 0.5
-            }
-
-            // 시간 차가 짧을 수록 complexity 증가
-            localComplexity *= (1 / (notes[i].getTimingMS() - notes[i - 1].getTimingMS()) + 1 / (notes[i - 1].getTimingMS() - notes[i - 2].getTimingMS()))
-            complexity += localComplexity;
-        }
-        return complexity / notes.length;
-    }
-
     // 스크롤 변화
     export function getScrollChange(notes: HitNote[]) {
         let bpmChange = 0;
@@ -98,17 +78,44 @@ export namespace Factor {
         };
         return bpmChange;
     }
+
+    export function getRhythmComplexity(notes: HitNote[]) {
+        let complexity = 0;
+        for (let i = 2; i < notes.length; i++) {
+            const d1 = notes[i].getTimingMS() - notes[i - 1].getTimingMS()
+            const d2 = notes[i - 1].getTimingMS() - notes[i - 2].getTimingMS()
+
+            const ratio = d1 / d2;
+            const log = Math.log2(ratio);
+
+            if (Math.abs(log - Math.round(log)) < 1e-3) {
+                complexity++;
+            }
+        }
+        return complexity;
+    }
+
+    export function getColorComplexity(notes: HitNote[]) {
+        let complexity = 0;
+        for (let i = 2; i < notes.length; i++) {
+            if (notes[i].type % 2 != notes[i - 2].type % 2) {
+                complexity += 1 / ((notes[i].getTimingMS() - notes[i - 2].getTimingMS()) ** 2)
+            }
+        }
+        return complexity;
+    }
 }
 
-export function factorize(course: Course) {
-    const notes = Factor.filterHitNotes(course)
+export function featurize(course: Course) {
+    const notes = Feature.filterHitNotes(course)
     return {
         note_count: notes.length,
-        density_avg: Factor.getAverageDensity(notes),
-        density_peak: Factor.getPeakDensity(notes),
-        bpm_avg: Factor.getAverageBPM(notes),
-        bpm_change: Factor.getBpmChange(notes),
-        complexity: Factor.getComplexity(notes),
-        scroll_change: Factor.getScrollChange(notes)
+        density_avg: Feature.getAverageDensity(notes),
+        density_peak: Feature.getPeakDensity(notes),
+        bpm_avg: Feature.getAverageBPM(notes),
+        bpm_change: Feature.getBpmChange(notes),
+        scroll_change: Feature.getScrollChange(notes),
+        rhythm_complexity: Feature.getRhythmComplexity(notes),
+        color_complexity: Feature.getColorComplexity(notes)
     };
 }
\ No newline at end of file
diff --git a/script/parse.ts b/preprocess/parse.ts
similarity index 100%
rename from script/parse.ts
rename to preprocess/parse.ts
diff --git a/preprocess/util.ts b/preprocess/util.ts
new file mode 100644
index 0000000..f8e51d1
--- /dev/null
+++ b/preprocess/util.ts
@@ -0,0 +1,15 @@
+import { Bar, Course, HitNote } from "tja-parser";
+
+export function filterHitNotes(course: Course): HitNote[] {
+    const notes: HitNote[] = [];
+    course.noteGroups.forEach((g) => {
+        if (g instanceof Bar) {
+            for (const note of g.getNotes()) {
+                if (note instanceof HitNote) {
+                    notes.push(note);
+                }
+            }
+        }
+    });
+    return notes;
+}
\ No newline at end of file
diff --git a/script/preprocess.ts b/script/preprocess.ts
new file mode 100644
index 0000000..a682191
--- /dev/null
+++ b/script/preprocess.ts
@@ -0,0 +1,65 @@
+import Bun from 'bun';
+import path from 'node:path';
+import { parseArgs } from 'node:util';
+import fs, { mkdirSync } from 'node:fs';
+import { Song } from 'tja-parser';
+import { featurize } from '../preprocess/featurize';
+import { parseTja } from '../preprocess/parse'
+
+const { values } = parseArgs({
+    args: Bun.argv,
+    options: {
+        outputDir: {
+            type: "string"
+        },
+        dataDir: {
+            type: "string"
+        }
+    },
+    strict: true,
+    allowPositionals: true,
+})
+
+if (!values.dataDir || !values.outputDir) {
+    console.error("--outputDir --dataDir");
+    process.exit(1);
+}
+
+const outputDir = values.outputDir ?? '';
+if (!fs.existsSync(outputDir)) mkdirSync(outputDir)
+const dataDir = values.dataDir ?? '';
+
+const tjaDir = path.join(dataDir, 'tja');
+const files = fs.readdirSync(tjaDir);
+
+const features: ({ songno: string, difficulty: 'oni' | 'ura' } & {})[] = [];
+for (const file of files) {
+    const tja = fs.readFileSync(path.join(tjaDir, file), 'utf-8');
+    const songno = path.basename(file, '.tja');
+    try {
+        const parsed = parseTja(tja);
+        const oni = parsed?.oni;
+        const edit = parsed?.edit;
+        if (oni) {
+            features.push({
+                songno,
+                difficulty: 'oni',
+                ...featurize(oni)
+            })
+        }
+        if (edit) {
+            features.push({
+                songno,
+                difficulty: 'ura',
+                ...featurize(edit)
+            })
+        }
+    }
+    catch (err) {
+        console.error(err);
+        console.error(file);
+    }
+}
+
+const featurePath = path.join(outputDir, 'features.json');
+fs.writeFileSync(featurePath, JSON.stringify(features, null, 2), 'utf-8');
\ No newline at end of file
diff --git a/train/train_xgboost.py b/train/train_xgboost.py
new file mode 100644
index 0000000..c30edb3
--- /dev/null
+++ b/train/train_xgboost.py
@@ -0,0 +1,313 @@
+import argparse
+import csv
+import json
+import math
+import os
+import joblib
+import numpy as np
+
+from xgboost import XGBRegressor
+from sklearn.model_selection import train_test_split
+from sklearn.preprocessing import StandardScaler
+from sklearn.metrics import mean_absolute_error
+
+# =========================================================
+# Hyper Parameters
+# =========================================================
+
+TEST_SIZE = 0.2
+RANDOM_STATE = 42
+
+N_ESTIMATORS = 500
+MAX_DEPTH = 6
+LEARNING_RATE = 0.05
+SUBSAMPLE = 0.8
+COLSAMPLE_BYTREE = 0.8
+
+CONTINUE_TRAINING = True
+
+# 예측 성공으로 간주할 허용 오차
+ERROR_TOLERANCE = 0.2
+
+# =========================================================
+# 파일명
+# =========================================================
+
+FEATURES_FILENAME = "features.json"
+MEASURE_FILENAME = "measure.csv"
+
+MODEL_FILENAME = "model.pkl"
+SCALER_FILENAME = "scaler.pkl"
+FEATURE_NAMES_FILENAME = "features.txt"
+
+# =========================================================
+# 무시할 key
+# =========================================================
+
+IGNORE_KEYS = {
+    "songno",
+    "difficulty"
+}
+
+
+def safe_float(value):
+    if value is None:
+        return 0.0
+
+    x = float(value)
+
+    if not math.isfinite(x):
+        return 0.0
+
+    return x
+
+
+def train_model(
+    working_dir: str,
+    data_dir: str
+):
+    # =====================================================
+    # path
+    # =====================================================
+
+    features_path = os.path.join(
+        working_dir,
+        FEATURES_FILENAME
+    )
+
+    measure_path = os.path.join(
+        data_dir,
+        MEASURE_FILENAME
+    )
+
+    model_path = os.path.join(
+        working_dir,
+        MODEL_FILENAME
+    )
+
+    scaler_path = os.path.join(
+        working_dir,
+        SCALER_FILENAME
+    )
+
+    feature_names_path = os.path.join(
+        working_dir,
+        FEATURE_NAMES_FILENAME
+    )
+
+    # =====================================================
+    # features.json
+    # =====================================================
+
+    with open(features_path, "r", encoding="utf-8") as f:
+        feature_data = json.load(f)
+
+    if len(feature_data) == 0:
+        raise ValueError("features.json is empty")
+
+    # =====================================================
+    # feature map
+    # =====================================================
+
+    feature_map = {}
+
+    for item in feature_data:
+        key = (
+            str(item["songno"]),
+            str(item["difficulty"])
+        )
+
+        feature_map[key] = item
+
+    # =====================================================
+    # feature names
+    # =====================================================
+
+    feature_names = sorted([
+        k for k in feature_data[0].keys()
+        if k not in IGNORE_KEYS
+    ])
+
+    # =====================================================
+    # measure.csv
+    # =====================================================
+
+    X = []
+    y = []
+
+    with open(measure_path, "r", encoding="utf-8") as f:
+        reader = csv.reader(f)
+        next(reader, None)
+
+        for row in reader:
+            if len(row) < 3:
+                continue
+
+            measure = safe_float(row[0])
+            songno = str(row[1])
+            diff = str(row[2])
+
+            key = (songno, diff)
+
+            if key not in feature_map:
+                print(
+                    f"[WARN] feature not found: "
+                    f"{songno} {diff}"
+                )
+                continue
+
+            feature_item = feature_map[key]
+
+            features = [
+                safe_float(feature_item.get(k, 0))
+                for k in feature_names
+            ]
+
+            X.append(features)
+            y.append(measure)
+
+    if len(X) == 0:
+        raise ValueError("No training data")
+
+    X = np.array(X, dtype=np.float32)
+    y = np.array(y, dtype=np.float32)
+
+    print(f"Dataset Size: {len(X)}")
+    print(f"Feature Count: {len(feature_names)}")
+
+    # =====================================================
+    # split
+    # =====================================================
+
+    X_train, X_valid, y_train, y_valid = train_test_split(
+        X,
+        y,
+        test_size=TEST_SIZE,
+        random_state=RANDOM_STATE
+    )
+
+    # =====================================================
+    # scaler
+    # =====================================================
+
+    if CONTINUE_TRAINING and os.path.exists(scaler_path):
+        print("Loading existing scaler...")
+
+        scaler = joblib.load(scaler_path)
+
+    else:
+        print("Creating new scaler...")
+
+        scaler = StandardScaler()
+        scaler.fit(X_train)
+
+    X_train = scaler.transform(X_train)
+    X_valid = scaler.transform(X_valid)
+
+    # =====================================================
+    # model
+    # =====================================================
+
+    if CONTINUE_TRAINING and os.path.exists(model_path):
+        print("Loading existing model...")
+
+        model = joblib.load(model_path)
+
+        previous_booster = model.get_booster()
+
+        model.fit(
+            X_train,
+            y_train,
+            xgb_model=previous_booster
+        )
+
+    else:
+        print("Creating new model...")
+
+        model = XGBRegressor(
+            n_estimators=N_ESTIMATORS,
+            max_depth=MAX_DEPTH,
+            learning_rate=LEARNING_RATE,
+            subsample=SUBSAMPLE,
+            colsample_bytree=COLSAMPLE_BYTREE,
+            objective="reg:squarederror",
+            random_state=RANDOM_STATE
+        )
+
+        model.fit(X_train, y_train)
+
+    # =====================================================
+    # evaluate
+    # =====================================================
+
+    pred = model.predict(X_valid)
+
+    mae = mean_absolute_error(y_valid, pred)
+
+    correct = np.sum(
+        np.abs(pred - y_valid) <= ERROR_TOLERANCE
+    )
+
+    accuracy = correct / len(y_valid)
+
+    print(f"\nMAE: {mae:.4f}")
+    print(
+        f"Accuracy "
+        f"(±{ERROR_TOLERANCE}): "
+        f"{accuracy:.4f}"
+    )
+
+    # =====================================================
+    # feature importance
+    # =====================================================
+
+    print("\nFeature Importance:")
+
+    importance = model.feature_importances_
+
+    pairs = list(zip(feature_names, importance))
+    pairs.sort(key=lambda x: x[1], reverse=True)
+
+    for name, score in pairs:
+        print(f"{name:25} {score:.6f}")
+
+    # =====================================================
+    # save
+    # =====================================================
+
+    joblib.dump(model, model_path)
+    joblib.dump(scaler, scaler_path)
+
+    with open(feature_names_path, "w", encoding="utf-8") as f:
+        for name in feature_names:
+            f.write(name + "\n")
+
+    print("\nSaved:")
+    print(model_path)
+    print(scaler_path)
+    print(feature_names_path)
+
+
+# =========================================================
+# main
+# =========================================================
+
+if __name__ == "__main__":
+    parser = argparse.ArgumentParser()
+
+    parser.add_argument(
+        "--workingDir",
+        required=True
+    )
+
+    parser.add_argument(
+        "--dataDir",
+        required=True
+    )
+
+    args = parser.parse_args()
+
+    train_model(
+        args.workingDir,
+        args.dataDir
+    )
\ No newline at end of file
diff --git a/train/train_xgboost_pick.py b/train/train_xgboost_pick.py
new file mode 100644
index 0000000..028cfe3
--- /dev/null
+++ b/train/train_xgboost_pick.py
@@ -0,0 +1,369 @@
+import argparse
+import csv
+import json
+import math
+import os
+import random
+import joblib
+import numpy as np
+
+from xgboost import XGBRegressor
+from sklearn.preprocessing import StandardScaler
+from sklearn.metrics import mean_absolute_error
+
+# =========================================================
+# Hyper Parameters
+# =========================================================
+
+TRAIN_SIZE = 0
+VALID_SIZE = 0
+
+RANDOM_STATE = 42
+
+N_ESTIMATORS = 500
+MAX_DEPTH = 6
+LEARNING_RATE = 0.05
+SUBSAMPLE = 0.8
+COLSAMPLE_BYTREE = 0.8
+
+CONTINUE_TRAINING = True
+
+# 예측 성공으로 간주할 허용 오차
+ERROR_TOLERANCE = 0.5
+
+# =========================================================
+# 파일명
+# =========================================================
+
+FEATURES_FILENAME = "features.json"
+MEASURE_FILENAME = "measure.csv"
+
+MODEL_FILENAME = "model.pkl"
+SCALER_FILENAME = "scaler.pkl"
+FEATURE_NAMES_FILENAME = "features.txt"
+
+# =========================================================
+# 무시할 key
+# =========================================================
+
+IGNORE_KEYS = {
+    "songno",
+    "difficulty"
+}
+
+
+# =========================================================
+# safe float
+# =========================================================
+
+def safe_float(value):
+    if value is None:
+        return 0.0
+
+    x = float(value)
+
+    if not math.isfinite(x):
+        return 0.0
+
+    return x
+
+
+# =========================================================
+# train
+# =========================================================
+
+def train_model(
+    working_dir: str,
+    data_dir: str
+):
+    random.seed(RANDOM_STATE)
+
+    # =====================================================
+    # path
+    # =====================================================
+
+    features_path = os.path.join(
+        working_dir,
+        FEATURES_FILENAME
+    )
+
+    measure_path = os.path.join(
+        data_dir,
+        MEASURE_FILENAME
+    )
+
+    model_path = os.path.join(
+        working_dir,
+        MODEL_FILENAME
+    )
+
+    scaler_path = os.path.join(
+        working_dir,
+        SCALER_FILENAME
+    )
+
+    feature_names_path = os.path.join(
+        working_dir,
+        FEATURE_NAMES_FILENAME
+    )
+
+    # =====================================================
+    # features.json
+    # =====================================================
+
+    with open(features_path, "r", encoding="utf-8") as f:
+        feature_data = json.load(f)
+
+    if len(feature_data) == 0:
+        raise ValueError("features.json is empty")
+
+    # =====================================================
+    # feature map
+    # =====================================================
+
+    feature_map = {}
+
+    for item in feature_data:
+        key = (
+            str(item["songno"]),
+            str(item["difficulty"])
+        )
+
+        feature_map[key] = item
+
+    # =====================================================
+    # feature names
+    # =====================================================
+
+    feature_names = sorted([
+        k for k in feature_data[0].keys()
+        if k not in IGNORE_KEYS
+    ])
+
+    # =====================================================
+    # dataset build
+    # =====================================================
+
+    dataset = []
+
+    with open(measure_path, "r", encoding="utf-8") as f:
+        reader = csv.reader(f)
+
+        next(reader, None)
+
+        for row in reader:
+            if len(row) < 3:
+                continue
+
+            measure = safe_float(row[0])
+            songno = str(row[1])
+            diff = str(row[2])
+
+            key = (songno, diff)
+
+            if key not in feature_map:
+                print(
+                    f"[WARN] feature not found: "
+                    f"{songno} {diff}"
+                )
+                continue
+
+            feature_item = feature_map[key]
+
+            features = [
+                safe_float(feature_item.get(k, 0))
+                for k in feature_names
+            ]
+
+            dataset.append((
+                features,
+                measure
+            ))
+
+    # =====================================================
+    # shuffle
+    # =====================================================
+
+    random.shuffle(dataset)
+
+    required_size = TRAIN_SIZE + VALID_SIZE
+
+    if len(dataset) < required_size:
+        raise ValueError(
+            f"Not enough dataset "
+            f"({len(dataset)} < {required_size})"
+        )
+
+    # =====================================================
+    # split
+    # =====================================================
+
+    train_dataset = dataset[:TRAIN_SIZE]
+    valid_dataset = dataset[
+        TRAIN_SIZE:
+        TRAIN_SIZE + VALID_SIZE
+    ]
+
+    X_train = np.array(
+        [x for x, _ in train_dataset],
+        dtype=np.float32
+    )
+
+    y_train = np.array(
+        [y for _, y in train_dataset],
+        dtype=np.float32
+    )
+
+    X_valid = np.array(
+        [x for x, _ in valid_dataset],
+        dtype=np.float32
+    )
+
+    y_valid = np.array(
+        [y for _, y in valid_dataset],
+        dtype=np.float32
+    )
+
+    print(f"Train Size: {len(X_train)}")
+    print(f"Valid Size: {len(X_valid)}")
+    print(f"Feature Count: {len(feature_names)}")
+
+    # =====================================================
+    # scaler
+    # =====================================================
+
+    if CONTINUE_TRAINING and os.path.exists(scaler_path):
+        print("Loading existing scaler...")
+
+        scaler = joblib.load(scaler_path)
+
+    else:
+        print("Creating new scaler...")
+
+        scaler = StandardScaler()
+        scaler.fit(X_train)
+
+    X_train = scaler.transform(X_train)
+    X_valid = scaler.transform(X_valid)
+
+    # =====================================================
+    # model
+    # =====================================================
+
+    if CONTINUE_TRAINING and os.path.exists(model_path):
+        print("Loading existing model...")
+
+        model = joblib.load(model_path)
+
+        previous_booster = model.get_booster()
+
+        model.fit(
+            X_train,
+            y_train,
+            xgb_model=previous_booster
+        )
+
+    else:
+        print("Creating new model...")
+
+        model = XGBRegressor(
+            n_estimators=N_ESTIMATORS,
+            max_depth=MAX_DEPTH,
+            learning_rate=LEARNING_RATE,
+            subsample=SUBSAMPLE,
+            colsample_bytree=COLSAMPLE_BYTREE,
+            objective="reg:squarederror",
+            random_state=RANDOM_STATE
+        )
+
+        model.fit(X_train, y_train)
+
+    # =====================================================
+    # evaluate
+    # =====================================================
+
+    pred = model.predict(X_valid)
+
+    mae = mean_absolute_error(y_valid, pred)
+
+    correct = np.sum(
+        np.abs(pred - y_valid) <= ERROR_TOLERANCE
+    )
+
+    accuracy = correct / len(y_valid)
+
+    print(f"\nMAE: {mae:.4f}")
+
+    print(
+        f"Accuracy "
+        f"(±{ERROR_TOLERANCE}): "
+        f"{accuracy:.4f}"
+    )
+
+    # =====================================================
+    # feature importance
+    # =====================================================
+
+    print("\nFeature Importance:")
+
+    importance = model.feature_importances_
+
+    pairs = list(zip(feature_names, importance))
+    pairs.sort(key=lambda x: x[1], reverse=True)
+
+    for name, score in pairs:
+        print(f"{name:25} {score:.6f}")
+
+    # =====================================================
+    # save
+    # =====================================================
+
+    joblib.dump(model, model_path)
+    joblib.dump(scaler, scaler_path)
+
+    with open(feature_names_path, "w", encoding="utf-8") as f:
+        for name in feature_names:
+            f.write(name + "\n")
+
+    print("\nSaved:")
+    print(model_path)
+    print(scaler_path)
+    print(feature_names_path)
+
+
+# =========================================================
+# main
+# =========================================================
+
+if __name__ == "__main__":
+    parser = argparse.ArgumentParser()
+
+    parser.add_argument(
+        "--workingDir",
+        required=True
+    )
+
+    parser.add_argument(
+        "--dataDir",
+        required=True
+    )
+    
+    parser.add_argument(
+        "--trainSize",
+        required=True
+    )
+    
+    parser.add_argument(
+        "--validSize",
+        required=True
+    )
+
+    args = parser.parse_args()
+    
+    TRAIN_SIZE = int(args.trainSize)
+    VALID_SIZE = int(args.validSize)
+
+    train_model(
+        args.workingDir,
+        args.dataDir
+    )
\ No newline at end of file
diff --git a/tsconfig.json b/tsconfig.json
deleted file mode 100644
index 1b20c17..0000000
--- a/tsconfig.json
+++ /dev/null
@@ -1,5 +0,0 @@
-{
-    "compilerOptions": {
-        "lib": []
-    }
-}
\ No newline at end of file