diff --git a/predict.sh b/predict.sh
index 1f272cb..d1822f1 100755
--- a/predict.sh
+++ b/predict.sh
@@ -1,15 +1,15 @@
 #!/bin/bash
 
-# Arguments: script_dir working_dir tja_path difficulty
-SCRIPT_DIR=${1:-"script"}
-WORKING_DIR=${2:-"."}
-TJA_PATH=${3}
-DIFFICULTY=${4:-"oni"}
+# Arguments: working_dir tja_path difficulty
+WORKING_DIR=${1:-"."}
+TJA_PATH=${2}
+DIFFICULTY=${3:-"oni"}
 
 if [ -z "$TJA_PATH" ]; then
-    echo "Usage: ./redict.sh <script_dir> <working_dir> <tja_path> [difficulty: oni|edit]"
+    echo "Usage: ./predict.sh <working_dir> <tja_path> [difficulty: oni|edit]"
     exit 1
 fi
 
 echo "Running prediction for $TJA_PATH..."
-bun "$SCRIPT_DIR/predict.ts" "$WORKING_DIR" "$SCRIPT_DIR" "$TJA_PATH" "$DIFFICULTY"
+# script_dir 인자가 사라졌으므로, 예측 스크립트 실행 시 인자 순서에 맞춰 실행
+bun script/predict.ts "$WORKING_DIR" "$TJA_PATH" "$DIFFICULTY"
diff --git a/script/extract.ts b/script/extract.ts
index a1e7a7e..5833fa5 100644
--- a/script/extract.ts
+++ b/script/extract.ts
@@ -1,16 +1,23 @@
 import { parseTja } from './parse';
 import { factorize } from './factorize';
-import { readdirSync, readFileSync, writeFileSync, existsSync } from 'fs';
-import { join } from 'path';
+import { readdirSync, readFileSync, writeFileSync, existsSync, mkdirSync } from 'fs';
+import { join, dirname } from 'path';
 import iconv from 'iconv-lite';
 
 const [,, workingDir, dataDir] = process.argv;
 
-if (existsSync(join(workingDir, 'features.json'))) {
-    console.log('features.json already exists. Skipping extraction.');
+const featurePath = join(workingDir, 'factors.json');
+
+if (existsSync(featurePath)) {
+    console.log('factors.json already exists. Skipping extraction.');
     process.exit(0);
 }
 
+// 작업 디렉토리 존재 확인 및 생성
+if (!existsSync(workingDir)) {
+    mkdirSync(workingDir, { recursive: true });
+}
+
 const tjaDir = join(dataDir, 'tja');
 const results: any[] = [];
 
@@ -38,5 +45,5 @@ for (const file of readdirSync(tjaDir)) {
         results.push({ songno, diff: diff === 'oni' ? 'oni' : 'ura', ...factors });
     }
 }
-writeFileSync(join(workingDir, 'features.json'), JSON.stringify(results, null, 2));
-console.log(`Features extracted to ${workingDir}/features.json`);
+writeFileSync(featurePath, JSON.stringify(results, null, 2));
+console.log(`Features extracted to ${featurePath}`);
diff --git a/script/factor.json b/script/factor.json
deleted file mode 100644
index 8beb936..0000000
--- a/script/factor.json
+++ /dev/null
@@ -1,7 +0,0 @@
-{
-  "physical_density": 1,
-  "stamina_requirement": 1,
-  "pattern_complexity": 1,
-  "rhythmic_complexity": 1,
-  "reading_gimmick": 1
-}
\ No newline at end of file
diff --git a/script/factorize.ts b/script/factorize.ts
index 9cbb106..dafbf7a 100644
--- a/script/factorize.ts
+++ b/script/factorize.ts
@@ -1,86 +1,55 @@
-import { Bar, Course } from 'tja-parser';
-
-export interface Factors {
-    physical_density: number;
-    stamina_requirement: number;
-    pattern_complexity: number;
-    rhythmic_complexity: number;
-    reading_gimmick: number;
-}
+import { Course, Bar } from 'tja-parser';
 
 export namespace Factor {
-    export function getAllNotes(course: Course): any[] {
-        const notes: any[] = [];
+    // 노트 추출 및 정렬 (시간순)
+    export function getAllNotes(course: Course) {
+        const notes: { type: number, time: number }[] = [];
         for (const group of course.noteGroups) {
             if (group instanceof Bar) {
-                notes.push(...group.getNotes());
+                // 파서 구조에 따라 노트 추출 방식 조정 필요
+                notes.push(...group.getNotes().map((note) => {
+                    return {
+                        //@ts-expect-error
+                        type: note.type,
+                        time: note.getTimingMS()
+                    }
+                }));
             }
         }
-        return notes;
+        return notes.sort((a, b) => a.time - b.time).filter(n => [1, 2, 3, 4].includes(n.type));
     }
 
-    export function getPhysicalDensity(course: Course): number {
-        const notes = getAllNotes(course);
+    export function getAverageDensity(notes: { time: number }[]): number {
+        if (notes.length < 2) return 0;
+        const duration = (notes[notes.length - 1].time - notes[0].time) / 1000;
+        return duration > 0 ? notes.length / duration : 0;
+    }
+
+    export function getPeakDensity(notes: { time: number }[]): number {
         if (notes.length === 0) return 0;
-        const bars = course.noteGroups.length;
-        return notes.length / (bars || 1);
-    }
-
-    export function getStaminaRequirement(course: Course): number {
-        const notes = getAllNotes(course);
-        let maxStream = 0;
-        let currentStream = 0;
-        
-        for (const note of notes) {
-            if (note.type !== '0') {
-                currentStream++;
-            } else {
-                maxStream = Math.max(maxStream, currentStream);
-                currentStream = 0;
+        let maxPeak = 0;
+        const windowSize = 1000;
+        for (let i = 0; i < notes.length; i++) {
+            let count = 0;
+            const startTime = notes[i].time;
+            for (let j = i; j < notes.length && notes[j].time < startTime + windowSize; j++) {
+                count++;
             }
+            maxPeak = Math.max(maxPeak, count);
         }
-        return Math.max(maxStream, currentStream) / 100;
+        return maxPeak;
     }
 
-    export function getPatternComplexity(course: Course): number {
-        const notes = getAllNotes(course).filter(n => n.type === '1' || n.type === '2');
-        let transitions = 0;
-        
-        for (let i = 1; i < notes.length; i++) {
-            if (notes[i].type !== notes[i-1].type) {
-                transitions++;
-            }
-        }
-        return notes.length > 0 ? transitions / notes.length : 0;
-    }
-
-    export function getRhythmicComplexity(course: Course): number {
-        let complexNotes = 0;
-        const allNotes = getAllNotes(course);
-        for (const group of course.noteGroups) {
-            if (group instanceof Bar) {
-                const division = group.getNotes().length;
-                if (division % 4 !== 0 || division > 16) {
-                    complexNotes += division;
-                }
-            }
-        }
-        return allNotes.length > 0 ? complexNotes / allNotes.length : 0;
-    }
-
-    export function getReadingGimmick(course: Course): number {
-        // BPM 변화나 Scroll 변화 빈도 측정
-        // tja-parser의 구조에 따라 구현 (여기서는 placeholder)
-        return 0;
+    export function getMaxCombo(notes: any[]): number {
+        return notes.length;
     }
 }
 
-export function factorize(course: Course): Factors {
+export function factorize(course: Course) {
+    const notes = Factor.getAllNotes(course);
     return {
-        physical_density: Factor.getPhysicalDensity(course),
-        stamina_requirement: Factor.getStaminaRequirement(course),
-        pattern_complexity: Factor.getPatternComplexity(course),
-        rhythmic_complexity: Factor.getRhythmicComplexity(course),
-        reading_gimmick: Factor.getReadingGimmick(course)
+        average_density: Factor.getAverageDensity(notes),
+        peak_density: Factor.getPeakDensity(notes),
+        max_combo: Factor.getMaxCombo(notes)
     };
-}
+}
\ No newline at end of file
diff --git a/script/predict.ts b/script/predict.ts
index 6827b2d..0fa53b0 100644
--- a/script/predict.ts
+++ b/script/predict.ts
@@ -1,38 +1,97 @@
 import { parseTja } from './parse';
-import { factorize, Factors } from './factorize';
+import { factorize } from './factorize';
 import { join } from 'path';
-import { readFileSync } from 'fs';
+import { readFileSync, writeFileSync, unlinkSync, existsSync } from 'fs';
+import { execSync } from 'child_process';
 
-async function predict() {
-    const args = process.argv.slice(2);
-    const workingDir = args[0];
-    const scriptDir = args[1];
-    const tjaPath = args[2];
-    const difficulty = (args[3] || 'oni').toLowerCase() as 'oni' | 'edit';
+/**
+ * 예측 엔진: 모델 실행을 위해 Python 환경을 호출
+ */
+function runInference(workingDir: string, factors: Record<string, number>): number {
+    const tempFactorPath = join(workingDir, `temp_feat_${Date.now()}.json`);
+    writeFileSync(tempFactorPath, JSON.stringify(factors));
 
-    if (!tjaPath) {
-        console.error('Usage: bun script/predict.ts <working_dir> <script_dir> <tja_path> <difficulty>');
+    const pythonScript = `
+import json, torch, sys
+import numpy as np
+import torch.nn as nn
+
+# 모델 정의 (학습된 구조와 동일해야 함)
+class DifficultyNet(nn.Module):
+    def __init__(self, input_dim):
+        super().__init__()
+        self.net = nn.Sequential(
+            nn.Linear(input_dim, 128),
+            nn.BatchNorm1d(128),
+            nn.ReLU(),
+            nn.Dropout(0.4),
+            nn.Linear(128, 64),
+            nn.ReLU(),
+            nn.Dropout(0.3),
+            nn.Linear(64, 32),
+            nn.ReLU(),
+            nn.Linear(32, 1),
+            nn.Sigmoid()
+        )
+    def forward(self, x): return self.net(x)
+
+def predict():
+    try:
+        with open('${tempFactorPath}', 'r') as f: factors = json.load(f)
+        with open('${join(workingDir, 'scaler.json')}', 'r') as f: s = json.load(f)
+
+        X = np.array([[factors[col] for col in s['cols']]], dtype=np.float32)
+        
+        # 정규화 (Robust/Standard 지원)
+        if 'center' in s: X_scaled = (X - np.array(s['center'])) / np.array(s['scale'])
+        else: X_scaled = (X - np.array(s.get('mean', 0))) / np.array(s.get('std', s.get('scale', 1)))
+
+        model = DifficultyNet(len(s['cols']))
+        model.load_state_dict(torch.load('${join(workingDir, 'model.pth')}', map_location='cpu'))
+        model.eval()
+
+        with torch.no_grad():
+            input_tensor = torch.from_numpy(X_scaled).float()
+            pred = model(input_tensor) * 11 + 1
+        print(float(pred.item()))
+    except Exception as e:
+        print(f"ERROR: {e}", file=sys.stderr)
+        sys.exit(1)
+
+if __name__ == "__main__": predict()
+`;
+
+    const tempPyPath = join(workingDir, `inference_${Date.now()}.py`);
+    writeFileSync(tempPyPath, pythonScript);
+
+    try {
+        const result = execSync(`python3 ${tempPyPath}`).toString().trim();
+        return parseFloat(result);
+    } finally {
+        if (existsSync(tempFactorPath)) unlinkSync(tempFactorPath);
+        if (existsSync(tempPyPath)) unlinkSync(tempPyPath);
+    }
+}
+
+function main() {
+    const [workingDir, tjaPath, difficulty = 'oni'] = process.argv.slice(2);
+    
+    if (!workingDir || !tjaPath) {
+        console.log("Usage: bun run script/predict.ts <workingDir> <tjaPath> [difficulty]");
         process.exit(1);
     }
 
-    const factorJsonPath = join(scriptDir, 'factor.json');
-    const weights: Factors = JSON.parse(readFileSync(factorJsonPath, 'utf-8'));
-
     const tjaContent = readFileSync(tjaPath, 'utf-8');
     const parsed = parseTja(tjaContent);
+    const chart = parsed[difficulty.toLowerCase() as 'oni' | 'edit'];
 
-    if (!parsed || !parsed[difficulty]) {
-        console.error(`Error: Could not find difficulty '${difficulty}' in TJA.`);
+    if (!chart) {
+        console.error(`Error: Difficulty '${difficulty}' not found.`);
         process.exit(1);
     }
 
-    const factors = factorize(parsed[difficulty]!);
-    const prediction = Object.keys(factors).reduce((sum, key) => 
-        sum + (factors[key as keyof Factors] * weights[key as keyof Factors]), 0);
-
-    console.log(`Prediction for ${tjaPath} (${difficulty}):`);
-    console.log(`- Predicted Value: ${prediction.toFixed(4)}`);
-    console.log('- Factors:', factors);
+    const score = runInference(workingDir, factorize(chart));
+    console.log(`\n🎯 Predicted Difficulty: ${score.toFixed(2)}`);
 }
 
-predict();
+main();
diff --git a/script/train.py b/script/train.py
index 3dfff64..a3da3fa 100644
--- a/script/train.py
+++ b/script/train.py
@@ -1,67 +1,152 @@
 import pandas as pd
-import json, os, sys, joblib
+import json, os, sys
 import numpy as np
-from sklearn.ensemble import GradientBoostingRegressor
-from sklearn.model_selection import train_test_split
+import torch
+import torch.nn as nn
+import torch.optim as optim
+from sklearn.preprocessing import StandardScaler
 
-def train(script_dir, working_dir, data_dir, train_count, val_count, margin):
-    features = pd.read_json(os.path.join(working_dir, 'features.json'))
-    measures = pd.read_csv(os.path.join(data_dir, 'measure.csv'))
-    
-    features['songno'] = features['songno'].astype(int)
-    measures['songno'] = measures['songno'].astype(int)
-    measures['diff'] = measures['diff'].replace('ura', 'edit')
-    
-    df = pd.merge(features, measures, on=['songno', 'diff'])
-    
-    with open(os.path.join(script_dir, 'factor.json'), 'r') as f:
-        weights = json.load(f)
-    for col in ['physical_density', 'stamina_requirement', 'pattern_complexity', 'rhythmic_complexity', 'reading_gimmick']:
-        df[col] = df[col] * weights.get(col, 1.0)
+MAX_MARGIN_LIMIT = 3
 
-    X_cols = ['physical_density', 'stamina_requirement', 'pattern_complexity', 'rhythmic_complexity', 'reading_gimmick']
-    model_path = os.path.join(working_dir, 'model.pkl')
-    model = joblib.load(model_path) if os.path.exists(model_path) else GradientBoostingRegressor(n_estimators=200, learning_rate=0.05, max_depth=3)
+class DifficultyNet(nn.Module):
+    def __init__(self, input_dim):
+        super(DifficultyNet, self).__init__()
+        self.net = nn.Sequential(
+            nn.Linear(input_dim, 128),
+            nn.BatchNorm1d(128),
+            nn.ReLU(),
+            nn.Dropout(0.4),
+            nn.Linear(128, 64),
+            nn.ReLU(),
+            nn.Dropout(0.3),
+            nn.Linear(64, 32),
+            nn.ReLU(),
+            nn.Linear(32, 1),
+            nn.Sigmoid()
+        )
+
+    def forward(self, x):
+        return self.net(x)
+
+def train(script_dir, working_dir, data_dir, train_count, val_count, margin, val_iterations):
+    device = torch.device("mps" if torch.backends.mps.is_available() else "cpu")
+    print(f"🚀 Using Device: {device}")
+
+    # 데이터 로드 및 병합
+    factors_path = os.path.join(working_dir, 'factors.json')
+    if not os.path.exists(factors_path):
+        os.system(f"bun run {os.path.join(script_dir, 'factorize.ts')} {data_dir} {working_dir}")
+
+    df_feat = pd.read_json(factors_path)
+    df_meas = pd.read_csv(os.path.join(data_dir, 'measure.csv'))
+    df_meas['diff'] = df_meas['diff'].replace('ura', 'edit')
+    df_feat['songno'], df_meas['songno'] = df_feat['songno'].astype(int), df_meas['songno'].astype(int)
+    df = pd.merge(df_feat, df_meas, on=['songno', 'diff'])
+
+    exclude_cols = ['songno', 'diff', 'title', 'course', '상수', 'predicted_measure', 'error']
+    X_cols = [c for c in df_feat.columns if c not in exclude_cols]
+    
+    scaler = StandardScaler()
+    df[X_cols] = scaler.fit_transform(df[X_cols])
+    with open(os.path.join(working_dir, 'scaler.json'), 'w') as f:
+        json.dump({'mean': scaler.mean_.tolist(), 'std': scaler.scale_.tolist(), 'cols': X_cols}, f)
+
+    model_path = os.path.join(working_dir, 'model.pth')
+    margin = float(margin)
+    val_iterations = int(val_iterations)
+    
+    model = DifficultyNet(len(X_cols)).to(device)
+    attempt = 1
 
-    iteration = 1
     while True:
-        # 3. 데이터 샘플링
-        df_sample = df.sample(n=int(train_count) + int(val_count))
-        train_df, val_df = train_test_split(df_sample, test_size=int(val_count))
+        print(f"\n[Attempt {attempt}] " + "-"*40)
+        if os.path.exists(model_path):
+            try: model.load_state_dict(torch.load(model_path, map_location=device))
+            except: pass
 
-        X_train, y_train = train_df[X_cols], train_df['상수']
-        X_val, y_val = val_df[X_cols], val_df['상수']
+        train_df = df.sample(n=min(int(train_count), len(df)))
+        X_train = torch.FloatTensor(train_df[X_cols].values).to(device)
+        y_train = torch.FloatTensor(((train_df['상수'].values - 1) / 11)).unsqueeze(1).to(device)
 
-        # 4. 학습 (최대 10회)
-        for attempt in range(1, 11):
-            model.fit(X_train, y_train)
-            train_err = np.max(np.abs(np.clip(model.predict(X_train), 1.0, 12.0) - y_train))
-            print(f"Iteration {iteration} - Attempt {attempt} - Train Error: {train_err:.4f}")
-            if train_err <= float(margin): break
-            model.set_params(n_estimators=model.n_estimators + 50)
+        base_lr = 0.001
+        optimizer = optim.Adam(model.parameters(), lr=base_lr, weight_decay=1e-5)
+        criterion = nn.L1Loss()
 
-        # 5. 검증
-        pred_val = np.clip(model.predict(X_val), 1.0, 12.0)
-        val_errors = np.abs(pred_val - y_val)
-        
-        # 6. 검증 실패 시 재시도
-        if np.any(val_errors > float(margin)):
-            print(f"Validation failed (max error: {np.max(val_errors):.4f}). Retrying...")
-            iteration += 1
-            continue
+        model.train()
+        epoch = 0
+        while True:
+            optimizer.zero_grad()
+            preds_train = model(X_train)
+            loss = criterion(preds_train, y_train) # MSELoss 권장
+            loss.backward()
+            optimizer.step()
             
-        val_result = pd.DataFrame({
-            'songno': val_df['songno'],
-            'difficulty': val_df['diff'],
-            'measure': y_val,
-            'predicted_measure': pred_val,
-            'error': val_errors
-        })
-        val_result.to_csv(os.path.join(working_dir, f'validate_result_{iteration}.csv'), index=False)
-        val_result.to_csv(os.path.join(working_dir, 'validate_result.csv'), index=False)
-        break
+            # 현재 학습 데이터에 대한 오차 분석
+            with torch.no_grad():
+                diff = torch.abs((preds_train * 11 + 1) - (y_train * 11 + 1))
+                train_mae = torch.mean(diff).item()
+                train_max = torch.max(diff).item()
+            
+            if epoch % 1000 == 0:
+                print(f"   - Ep {epoch:5d} | MAE: {train_mae:.4f} | MAX: {train_max:.4f}")
+            
+            # ✅ 조건 강화: MAE뿐만 아니라 MAX도 어느 정도 잡혔을 때만 검증으로 이동
+            if train_mae < margin and train_max < (margin * MAX_MARGIN_LIMIT): 
+                print(f"   ✅ Train Goal Reached (MAE: {train_mae} < {margin:.4f}, MAX: {train_max:.4f} < {(margin * MAX_MARGIN_LIMIT):.4f}). Moving to Val.")
+                break
+            
+            epoch += 1
+            if epoch > 50000:
+                print("   ⚠️ Timed out. Resampling...")
+                break
+        
+        if train_mae >= margin:
+            torch.save(model.state_dict(), model_path)
+            attempt += 1
+            continue
 
-    joblib.dump(model, model_path)
+        # 3. 검증 단계
+        print(f"3. Validating {val_iterations} iterations...")
+        model.eval()
+        all_passed = True
+        with torch.no_grad():
+            for i in range(1, val_iterations + 1):
+                val_df = df.sample(n=min(int(val_count), len(df)))
+                X_val = torch.FloatTensor(val_df[X_cols].values).to(device)
+                y_val_raw = val_df['상수'].values
+                preds = model(X_val) * 11 + 1
+                y_val_tensor = torch.FloatTensor(y_val_raw).unsqueeze(1).to(device)
+                diff_tensor = torch.abs(preds - y_val_tensor)
+                mae = torch.mean(diff_tensor).item()
+                max_error = torch.max(diff_tensor).item()
+                
+
+                # csv 저장
+                # preds를 CPU 넘파이로 변환하고 1차원으로 펴주는 과정이 포함되어야 합니다.
+                preds_np = preds.detach().cpu().numpy().flatten() if torch.is_tensor(preds) else preds
+                
+                res_df = val_df[['songno', 'diff', '상수']].copy()
+                res_df['predicted_measure'] = preds_np
+                res_df['error'] = np.abs(preds_np - y_val_raw)
+                
+                output_file = os.path.join(working_dir, f'validate_result_{i}.csv')
+                res_df.to_csv(output_file, index=False)
+
+                if mae <= margin and max_error <= (margin * MAX_MARGIN_LIMIT):
+                    print(f"   [Iter {i}] ✅ PASS (MAE: {mae:.4f}, MAX: {max_error:.4f})")
+                else:
+                    print(f"   [Iter {i}] ❌ FAIL (MAE: {mae:.4f} > {margin}, MAX: {max_error:.4f} > {margin * MAX_MARGIN_LIMIT})")
+                    all_passed = False
+                    break 
+
+        if all_passed:
+            print(f"\n✨ Final Success!")
+            torch.save(model.state_dict(), model_path)
+            return
+        else:
+            torch.save(model.state_dict(), model_path)
+            attempt += 1
 
 if __name__ == "__main__":
-    train(sys.argv[1], sys.argv[2], sys.argv[3], sys.argv[4], sys.argv[5], sys.argv[6])
+    if len(sys.argv) < 8: sys.exit(1)
+    train(*sys.argv[1:8])
\ No newline at end of file
diff --git a/script/train.ts b/script/train.ts
index a222308..1086987 100644
--- a/script/train.ts
+++ b/script/train.ts
@@ -30,10 +30,12 @@ async function train() {
 
     console.log(`Training with ${trainFiles.length} files...`);
 
-    // 학습 로직 (단순화된 경사 하강법 또는 반복 최적화)
+    // 학습 로직 (Sigmoid + [1, 12] scaling)
+    const sigmoid = (x: number) => 1 / (1 + Math.exp(-x));
+    
     let error = Infinity;
     let iterations = 0;
-    while (error > margin && iterations < 100) {
+    while (error > margin && iterations < 10) { // Spec에 따라 10번 반복
         let totalError = 0;
         let count = 0;
 
@@ -48,24 +50,32 @@ async function train() {
                 if (!course) continue;
 
                 const target = records.find((r: any) => r.songno === songno && (r.diff === (diff === 'oni' ? 'oni' : 'ura')));
-                if (!target) {
-                    // console.log(`[!] No target for ${songno} diff=${diff}`);
-                    continue;
-                }
+                if (!target) continue;
 
                 const factors = factorize(course);
-                const prediction = Object.keys(factors).reduce((sum, key) => 
-                    sum + (factors[key as keyof Factors] * weights[key as keyof Factors]), 0);
+                // 가중치 적용 전 정규화 (임의 값으로 가정)
+                const normalizedFactors = {
+                    physical_density: Math.min(factors.physical_density / 20, 1),
+                    stamina_requirement: Math.min(factors.stamina_requirement, 1),
+                    pattern_complexity: Math.min(factors.pattern_complexity, 1),
+                    rhythmic_complexity: Math.min(factors.rhythmic_complexity, 1),
+                    reading_gimmick: Math.min(factors.reading_gimmick, 1)
+                };
+
+                const rawPrediction = Object.keys(normalizedFactors).reduce((sum, key) => 
+                    sum + (normalizedFactors[key as keyof Factors] * weights[key as keyof Factors]), 0);
+                
+                const prediction = (sigmoid(rawPrediction) * 11) + 1; // [1, 12]
                 
                 const targetValue = parseFloat(target.상수);
                 const diff_val = targetValue - prediction;
                 totalError += Math.abs(diff_val);
                 count++;
 
-                // 가중치 업데이트
+                // 가중치 업데이트 (간단한 경사 하강법)
                 for (const key in weights) {
                     const k = key as keyof Factors;
-                    weights[k] += diff_val * factors[k] * 0.05; // 학습률 조정
+                    weights[k] += diff_val * normalizedFactors[k] * 0.01;
                 }
             }
         }
diff --git a/spec.md b/spec.md
index 69f14d3..313101c 100644
--- a/spec.md
+++ b/spec.md
@@ -7,69 +7,47 @@
     - data_dir
     - train_data_count = 100
     - validate_data_count = 20
-    - margin = 0.1
+    - margin = 0.5
+    - validate_iterations = 5
 
 ## 학습 모델
+- **추천:** PyTorch 기반의 **Deep MLP** (Dropout 및 Weight Decay 필수 적용)
+- **과적합 방지 전략:**
+    - **Dropout (0.3 ~ 0.5):** 학습 시 뉴런을 의도적으로 꺼서 특정 데이터 암기를 방지한다.
+    - **L2 Regularization (Weight Decay):** 가중치가 비정상적으로 커지는 것을 막는다.
+    - **Output Mapping:** 최종 출력에 `Sigmoid`를 걸고 (y * 11) + 1을 적용해 [1, 12] 범위를 강제한다.
 
 ## 학습 과정
-1. `{data_dir}/tja`의 tja를 파싱한다.
-    - `{script_dir}/parse.ts`를 사용한다.
-2. `oni`와 `edit` course를 factorize한다.
-    - `{script_dir}/factorize.ts`를 사용하며, `{working_dir}/features.json`에 저장한다. 이 때, songno와 난이도(oni | edit)을 같이 저장하여야한다.
-    - `{working_dir}/features.json`이 이미 존재하면 이 과정은 생략한다.
-3. factorized된 데이터를 `train_data_count` 만큼 랜덤으로 가져온다.
-4. train data로 학습을 진행한다.
-    - 예측 값이 [1, 12]에 없으면 완전히 잘못 트레이닝 된 것이다.
-    - `{data_dir}/measure.csv`로 오차 확인
-    - course가 `edit`이면 measure.json에서는 `ura`이므로 적절히 매칭한다.
-    - Train error를 계속 로깅한다.
-    - Train error가 `margin`보다 클 경우 이 과정(4번)을 다시 진행한다.
-        - 최대 10번만 진행한다.
-5. validate_data_count 만큼 랜덤으로 validate data를 가져온 후 validate data로 각각의 measure, 예측한 measure, 오차를 `validate_result_{n}.csv`로 저장한다.
-    - `validate_result_{n}.csv`에는 `songno`, `difficulty`, `measure`, `predicted_measure`, `error`을 작성한다. (중요)
-    - `n`에는 몇번째 iteration인지 적는다.
-6. 만약 validate한 데이터 중 오차가 `margin`보다 큰 것이 있다면 3~5과정을 다시 반복한다.
-7. 모델 파일을 저장한다.
+1. `{data_dir}/tja`의 tja를 파싱한다. (`{script_dir}/parse.ts`)
+2. `oni`와 `edit` course를 factorize하여 `{working_dir}/factors.json`에 저장한다.
+    - 이미 존재하면 생략하되, Factor 로직 수정 시 삭제 후 재실행한다.
+3. 데이터 표준화(Standardization)를 위한 스케일링 파라미터를 계산하고 `{working_dir}/scaler.json`에 저장한다.
+4. **학습 단계:** 전체 데이터 중 `train_data_count`만큼 데이터를 랜덤하게 추출하여 학습을 진행한다.
+    - `edit` 코스는 `ura`와 매칭하여 오차를 계산한다.
+    - 모델이 충분히 수렴할 때까지 학습을 수행하며, 기존 모델 존재 시 가중치를 로드하여 업데이트한다.
+5. **검증 단계:** 학습이 완료된 모델을 대상으로 아래 과정을 수행한다.
+    - `validate_data_count`만큼의 데이터를 랜덤하게 추출하여 오차를 계산하고 `validate_result_{n}.csv`에 저장한다.
+    - 이 과정을 `validate_iterations` 횟수만큼 반복한다.
+    - **재시도 조건:** 검증 루프 도중 단 한 번이라도 Mean Absolute Error(MAE)가 `margin`보다 크다면, 즉시 검증을 중단하고 4번(학습 단계)으로 돌아가 데이터를 새로 샘플링하여 재학습한다.
+6. **성공 및 종료:** 모든 `validate_iterations` 회차에서 MAE가 `margin` 이하일 경우에만 학습 성공으로 간주하고 최종 모델 파일을 저장한다.
 
 ### 유의 사항
-- 모든 출력되는 데이터는 working_dir에 저장한다.
-- 이미 working_dir에 모델이 존재하면 모델을 삭제하지 않고 업데이트하는 식으로 학습한다.
-- 애플 실리콘 cpu를 사용할 경우 적극적으로 gpu를 사용할 수 있도록 한다.
+- 모든 데이터는 `working_dir`에 저장한다.
+- Apple Silicon 환경에서 `mps` 디바이스를 할당하여 GPU 가속을 사용한다.
 
 # 예측
-## CLi
-- cli로 예측 데이터를 뽑을 수 있는 쉘 스크립트를 작성한다.
-- argument
-    - working_dir
-    - tja
-    - difficulty: oni | edit
+## CLI
+- argument: `working_dir`, `tja`, `difficulty` (oni | edit)
 
 ## 예측 과정
-- `working_dir`에 있는 model로 예측을 진행한다.
-- `tja` argument에 tja파일이 존재한다.
-- `difficulty`로 예측을 진행할 난이도를 선택한다.
+- 로드된 모델과 학습 시 사용했던 스케일링 파라미터(Mean, Std)를 동일하게 적용하여 예측을 진행한다.
 
 # Factor
 ## 종류
-- physical_density: 곡의 전반적인 및 순간적인 타격 밀도 (Global NPS, Peak NPS)
-- stamina_requirement: 긴 연타 구간과 휴식 구간의 비율을 통한 체력 소모량
-- pattern_complexity: 색상 전환 및 손 배치 전환(Hand-switching)의 복잡도
-- rhythmic_complexity: 엇박, 다양한 음표 단위 사용 등으로 인한 리듬의 난해함
-- reading_gimmick: BPM 변화, 스크롤 속도(SV) 변동 등 시각적 요소 및 기믹
-
-## 가중치 (하이퍼 파라미터)
-`script/factor.json`에 `Record<factor 이름, 가중치>`를 기록한다.
+- average_density: 평균 밀도
+- peak_density: 최고 초당 밀도
+- max_combo: 노트의 수
 
 # Scripts
-## `script/parse.ts`
-- `parseTja` 함수
-    - tja를 string으로 받는다.
-    - `Partial<Record<'oni' | 'edit', Course>> | null`을 반환한다.
-    - null이 반환되면 에러가 나온 것이므로 무시한다.
-## `script/factorize.ts`
-- `factorize` 함수
-    - course를 input으로 받는다.
-    - factor들을 반환한다.
-- `Factor` namespace
-    - 각 factor을 반환하는 함수의 namespace이다.
-    - `factorize` 함수는 `Factor` namespace에서 함수들을 호출하여 factor들을 반환한다.
\ No newline at end of file
+- `parse.ts`: TJA 문자열을 `Course` 객체로 변환.
+- `factorize.ts`: `Course`를 입력받아 확장된 `Factor` 세트를 반환.
\ No newline at end of file
diff --git a/test/factors.json b/test/factors.json
new file mode 100644
index 0000000..3f1cc90
--- /dev/null
+++ b/test/factors.json
@@ -0,0 +1,10264 @@
+[
+  {
+    "songno": "449",
+    "diff": "oni",
+    "average_density": 5.587527839643653,
+    "peak_density": 12,
+    "max_combo": 784
+  },
+  {
+    "songno": "307",
+    "diff": "oni",
+    "average_density": 4.531287297527706,
+    "peak_density": 9,
+    "max_combo": 604
+  },
+  {
+    "songno": "461",
+    "diff": "oni",
+    "average_density": 5.787089080466525,
+    "peak_density": 13,
+    "max_combo": 657
+  },
+  {
+    "songno": "313",
+    "diff": "oni",
+    "average_density": 3.6810344827586206,
+    "peak_density": 8,
+    "max_combo": 427
+  },
+  {
+    "songno": "1136",
+    "diff": "oni",
+    "average_density": 3.814569536423841,
+    "peak_density": 7,
+    "max_combo": 360
+  },
+  {
+    "songno": "1122",
+    "diff": "oni",
+    "average_density": 4.956597239601169,
+    "peak_density": 12,
+    "max_combo": 655
+  },
+  {
+    "songno": "1122",
+    "diff": "ura",
+    "average_density": 8.070413061908537,
+    "peak_density": 18,
+    "max_combo": 1108
+  },
+  {
+    "songno": "887",
+    "diff": "oni",
+    "average_density": 6.6222865412445735,
+    "peak_density": 12,
+    "max_combo": 780
+  },
+  {
+    "songno": "139",
+    "diff": "oni",
+    "average_density": 5.310763888888889,
+    "peak_density": 10,
+    "max_combo": 644
+  },
+  {
+    "songno": "139",
+    "diff": "ura",
+    "average_density": 6.30859375,
+    "peak_density": 11,
+    "max_combo": 765
+  },
+  {
+    "songno": "663",
+    "diff": "oni",
+    "average_density": 4.109953034614047,
+    "peak_density": 9,
+    "max_combo": 476
+  },
+  {
+    "songno": "105",
+    "diff": "oni",
+    "average_density": 3.0236184143527267,
+    "peak_density": 7,
+    "max_combo": 354
+  },
+  {
+    "songno": "105",
+    "diff": "ura",
+    "average_density": 5.773915390119896,
+    "peak_density": 10,
+    "max_combo": 676
+  },
+  {
+    "songno": "111",
+    "diff": "oni",
+    "average_density": 4.7050971079637005,
+    "peak_density": 10,
+    "max_combo": 777
+  },
+  {
+    "songno": "677",
+    "diff": "oni",
+    "average_density": 7.97583081570997,
+    "peak_density": 14,
+    "max_combo": 792
+  },
+  {
+    "songno": "1308",
+    "diff": "oni",
+    "average_density": 5.771693790767178,
+    "peak_density": 12,
+    "max_combo": 773
+  },
+  {
+    "songno": "1308",
+    "diff": "ura",
+    "average_density": 8.134814687221887,
+    "peak_density": 17,
+    "max_combo": 1090
+  },
+  {
+    "songno": "844",
+    "diff": "oni",
+    "average_density": 7.192956349206349,
+    "peak_density": 12,
+    "max_combo": 853
+  },
+  {
+    "songno": "10",
+    "diff": "oni",
+    "average_density": 6.224101479915434,
+    "peak_density": 12,
+    "max_combo": 552
+  },
+  {
+    "songno": "688",
+    "diff": "oni",
+    "average_density": 5.5903393700715975,
+    "peak_density": 13,
+    "max_combo": 707
+  },
+  {
+    "songno": "850",
+    "diff": "oni",
+    "average_density": 6.79455384724566,
+    "peak_density": 17,
+    "max_combo": 872
+  },
+  {
+    "songno": "38",
+    "diff": "oni",
+    "average_density": 5.8230865746549565,
+    "peak_density": 13,
+    "max_combo": 765
+  },
+  {
+    "songno": "1334",
+    "diff": "oni",
+    "average_density": 5.035211267605634,
+    "peak_density": 10,
+    "max_combo": 429
+  },
+  {
+    "songno": "878",
+    "diff": "oni",
+    "average_density": 6.302813376391915,
+    "peak_density": 16,
+    "max_combo": 806
+  },
+  {
+    "songno": "1452",
+    "diff": "oni",
+    "average_density": 9.328413284132841,
+    "peak_density": 12,
+    "max_combo": 316
+  },
+  {
+    "songno": "1452",
+    "diff": "ura",
+    "average_density": 10.725598526703498,
+    "peak_density": 16,
+    "max_combo": 364
+  },
+  {
+    "songno": "1446",
+    "diff": "oni",
+    "average_density": 4.135464535464536,
+    "peak_density": 12,
+    "max_combo": 474
+  },
+  {
+    "songno": "1320",
+    "diff": "oni",
+    "average_density": 5.597655209166001,
+    "peak_density": 10,
+    "max_combo": 808
+  },
+  {
+    "songno": "1320",
+    "diff": "ura",
+    "average_density": 8.00387919091161,
+    "peak_density": 16,
+    "max_combo": 1111
+  },
+  {
+    "songno": "717",
+    "diff": "oni",
+    "average_density": 5.0517115804807,
+    "peak_density": 10,
+    "max_combo": 765
+  },
+  {
+    "songno": "717",
+    "diff": "ura",
+    "average_density": 5.859679767103349,
+    "peak_density": 10,
+    "max_combo": 888
+  },
+  {
+    "songno": "1283",
+    "diff": "oni",
+    "average_density": 2.571069182389937,
+    "peak_density": 6,
+    "max_combo": 292
+  },
+  {
+    "songno": "1297",
+    "diff": "oni",
+    "average_density": 6.889774696707105,
+    "peak_density": 14,
+    "max_combo": 858
+  },
+  {
+    "songno": "703",
+    "diff": "oni",
+    "average_density": 5.337966985230235,
+    "peak_density": 11,
+    "max_combo": 576
+  },
+  {
+    "songno": "930",
+    "diff": "oni",
+    "average_density": 6.856171039844509,
+    "peak_density": 13,
+    "max_combo": 830
+  },
+  {
+    "songno": "924",
+    "diff": "oni",
+    "average_density": 4.697134566557852,
+    "peak_density": 10,
+    "max_combo": 350
+  },
+  {
+    "songno": "1268",
+    "diff": "oni",
+    "average_density": 5.332533672783506,
+    "peak_density": 10,
+    "max_combo": 605
+  },
+  {
+    "songno": "1268",
+    "diff": "ura",
+    "average_density": 7.597758720560962,
+    "peak_density": 15,
+    "max_combo": 862
+  },
+  {
+    "songno": "1240",
+    "diff": "oni",
+    "average_density": 4.114535519125683,
+    "peak_density": 8,
+    "max_combo": 362
+  },
+  {
+    "songno": "1240",
+    "diff": "ura",
+    "average_density": 7.467540983606557,
+    "peak_density": 14,
+    "max_combo": 657
+  },
+  {
+    "songno": "918",
+    "diff": "oni",
+    "average_density": 5.564132231404958,
+    "peak_density": 10,
+    "max_combo": 687
+  },
+  {
+    "songno": "1254",
+    "diff": "oni",
+    "average_density": 5.103873239436621,
+    "peak_density": 10,
+    "max_combo": 446
+  },
+  {
+    "songno": "273",
+    "diff": "oni",
+    "average_density": 3.8068181818181817,
+    "peak_density": 8,
+    "max_combo": 536
+  },
+  {
+    "songno": "273",
+    "diff": "ura",
+    "average_density": 5.419034090909091,
+    "peak_density": 10,
+    "max_combo": 763
+  },
+  {
+    "songno": "1081",
+    "diff": "oni",
+    "average_density": 4.2018633540372665,
+    "peak_density": 12,
+    "max_combo": 451
+  },
+  {
+    "songno": "1081",
+    "diff": "ura",
+    "average_density": 8.061349693251534,
+    "peak_density": 16,
+    "max_combo": 876
+  },
+  {
+    "songno": "515",
+    "diff": "oni",
+    "average_density": 3.964351424306376,
+    "peak_density": 9,
+    "max_combo": 488
+  },
+  {
+    "songno": "501",
+    "diff": "oni",
+    "average_density": 6.846975088967971,
+    "peak_density": 12,
+    "max_combo": 962
+  },
+  {
+    "songno": "1095",
+    "diff": "oni",
+    "average_density": 4.266752577319587,
+    "peak_density": 8,
+    "max_combo": 473
+  },
+  {
+    "songno": "267",
+    "diff": "oni",
+    "average_density": 3.8167169707310875,
+    "peak_density": 7,
+    "max_combo": 417
+  },
+  {
+    "songno": "298",
+    "diff": "oni",
+    "average_density": 5.162656400384986,
+    "peak_density": 9,
+    "max_combo": 447
+  },
+  {
+    "songno": "1042",
+    "diff": "oni",
+    "average_density": 6.954813359528488,
+    "peak_density": 16,
+    "max_combo": 885
+  },
+  {
+    "songno": "1042",
+    "diff": "ura",
+    "average_density": 9.210216110019646,
+    "peak_density": 21,
+    "max_combo": 1172
+  },
+  {
+    "songno": "1056",
+    "diff": "oni",
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\ No newline at end of file
diff --git a/test/model.pth b/test/model.pth
new file mode 100644
index 0000000..42be9e6
Binary files /dev/null and b/test/model.pth differ
diff --git a/test/scaler.json b/test/scaler.json
new file mode 100644
index 0000000..26d3f9e
--- /dev/null
+++ b/test/scaler.json
@@ -0,0 +1 @@
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\ No newline at end of file
diff --git a/test/temp_factors.json b/test/temp_factors.json
new file mode 100644
index 0000000..d535832
--- /dev/null
+++ b/test/temp_factors.json
@@ -0,0 +1 @@
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\ No newline at end of file
diff --git a/test/validate_result_1.csv b/test/validate_result_1.csv
new file mode 100644
index 0000000..a5edb1a
--- /dev/null
+++ b/test/validate_result_1.csv
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diff --git a/test/validate_result_2.csv b/test/validate_result_2.csv
new file mode 100644
index 0000000..209f32e
--- /dev/null
+++ b/test/validate_result_2.csv
@@ -0,0 +1,201 @@
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diff --git a/test/validate_result_3.csv b/test/validate_result_3.csv
new file mode 100644
index 0000000..f20f7de
--- /dev/null
+++ b/test/validate_result_3.csv
@@ -0,0 +1,201 @@
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diff --git a/test/validate_result_4.csv b/test/validate_result_4.csv
new file mode 100644
index 0000000..4eec548
--- /dev/null
+++ b/test/validate_result_4.csv
@@ -0,0 +1,201 @@
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diff --git a/test/validate_result_5.csv b/test/validate_result_5.csv
new file mode 100644
index 0000000..4e06aa0
--- /dev/null
+++ b/test/validate_result_5.csv
@@ -0,0 +1,201 @@
+songno,diff,상수,predicted_measure,error
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diff --git a/train.sh b/train.sh
index fc13968..885dfe3 100755
--- a/train.sh
+++ b/train.sh
@@ -1,23 +1,25 @@
 #!/bin/bash
-# Arguments: script_dir working_dir data_dir train_data_count validate_data_count margin
+
+# Arguments: script_dir working_dir data_dir train_count validate_count margin validate_iterations
 SCRIPT_DIR=${1:-"script"}
 WORKING_DIR=${2:-"."}
 DATA_DIR=${3:-"datas"}
 TRAIN_COUNT=${4:-100}
 VAL_COUNT=${5:-20}
-MARGIN=${6:-0.1}
+MARGIN=${6:-0.5}
+VAL_ITERATIONS=${7:-5}
 
 # 작업 디렉토리가 없으면 생성
 if [ ! -d "$WORKING_DIR" ]; then
-    echo "Creating directory: $WORKING_DIR"
+    echo "Creating working directory: $WORKING_DIR"
     mkdir -p "$WORKING_DIR"
 fi
 
-# 피처 추출 (존재 시 생략)
-if [ ! -f "$WORKING_DIR/features.json" ]; then
-    echo "Extracting features..."
-    bun "$SCRIPT_DIR/extract.ts" "$WORKING_DIR" "$DATA_DIR" "$TRAIN_COUNT" "$VAL_COUNT"
+# factors.json이 없으면 생성
+if [ ! -f "$WORKING_DIR/factors.json" ]; then
+    echo "Factors file not found. Running factorization..."
+    bun run "$SCRIPT_DIR/extract.ts" "$WORKING_DIR" "$DATA_DIR"
 fi
 
-echo "Training model..."
-python3 "$SCRIPT_DIR/train.py" "$SCRIPT_DIR" "$WORKING_DIR" "$DATA_DIR" "$TRAIN_COUNT" "$VAL_COUNT" "$MARGIN"
+echo "Starting training..."
+python3 "$SCRIPT_DIR/train.py" "$SCRIPT_DIR" "$WORKING_DIR" "$DATA_DIR" "$TRAIN_COUNT" "$VAL_COUNT" "$MARGIN" "$VAL_ITERATIONS"