🚀 CHIẾN LƯỢC V2: TOÀN DIỆN ĐẠT >95%
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Clean data: (652, 24, 16, 16), 7 classes

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CNN + TTA (Test-Time Augmentation)
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  Ep 1 Loss=1.6500 TTA-Acc=0.1450 🌟
  Ep 2 Loss=1.4633 TTA-Acc=0.3511 🌟
  Ep 3 Loss=1.3316 TTA-Acc=0.6336 🌟
  Ep 4 Loss=1.2101 TTA-Acc=0.7252 🌟
  Ep 6 Loss=1.2056 TTA-Acc=0.8015 🌟
  Ep 13 Loss=1.1216 TTA-Acc=0.8244 🌟
  Ep 23 Loss=0.9355 TTA-Acc=0.8321 🌟
  Ep 30 Loss=0.9346 TTA-Acc=0.8092 (pat=7)
  Ep 60 Loss=0.9658 TTA-Acc=0.7634 (pat=37)
  Ep 69 Loss=0.8988 TTA-Acc=0.8397 🌟
  Ep 74 Loss=0.9159 TTA-Acc=0.8550 🌟
  Ep 90 Loss=0.8761 TTA-Acc=0.8168 (pat=16)
  Ep 120 Loss=0.9473 TTA-Acc=0.8092 (pat=46)
  Ep 139 Loss=0.9317 TTA-Acc=0.8626 🌟
  Ep 150 Loss=0.7716 TTA-Acc=0.8397 (pat=11)
  Ep 175 Loss=0.7432 TTA-Acc=0.8702 🌟
  Ep 180 Loss=0.8290 TTA-Acc=0.8702 (pat=5)
  Ep 210 Loss=0.8060 TTA-Acc=0.8626 (pat=35)
  Ep 240 Loss=0.6980 TTA-Acc=0.8473 (pat=65)
  Early stop ep 255
  ✅ CNN+TTA best: 0.8702

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RICH FEATURES V2 + ENSEMBLE
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Extracted 1713 features per sample
  XGB: 0.7557
  LGBM: 0.7634
  ET: 0.7481
  RF: 0.7557
  Voting: 0.7634

  5-Fold CV:
    Fold 1: 0.7557
    Fold 2: 0.7939
    Fold 3: 0.7769
    Fold 4: 0.8308
    Fold 5: 0.8000
  CV: 0.7915 ± 0.0249

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HYBRID V2: CNN embed + Rich features + XGBoost
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Extracted 1713 features per sample
  Combined: (652, 2097)
  ✅ Hybrid V2: 0.8244
  CV: 0.9142 ± 0.0194

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📊 KẾT QUẢ TỔNG HỢP V2
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  ✅ Hybrid CV: 0.9142
  📈 CNN+TTA: 0.8702
  📈 Hybrid V2: 0.8244
  📈 Ens CV: 0.7915
  📈 Ens_LGBM: 0.7634
  📈 Ens_Vote: 0.7634
  📈 Ens_XGB: 0.7557
  📈 Ens_RF: 0.7557
  📈 Ens_ET: 0.7481

🏆 BEST: Hybrid CV = 0.9142
