Architecture,Model 1 baseline,Model 2,Model 3,Model 4,Model 5 1. Embedding Layer,✓,✓,✓,✓,✓ 2. LSTM Layer (150 units),✓,✓ (150 units),Bidirectional (150 units),"Bidirectional (250 units, return_sequences=True)", 3. Dropout (0.1),✓,✓,✓,✓,✓ 4. LSTM Layer (100 units),,✓ (100 units),,Bidirectional (150 units), 5. Dropout (0.1) - 2nd occurrence,,✓,,✓, 6. GRU Layer (150 units),,,,,✓ (150 units) 7. Dense Layer,✓,✓,✓,✓,✓