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Fine-tune FLAN-T5-base (about 250M parameters) on the training dialogues: learning rate about 3e-4 (T5 likes higher rates than BERT), 3 epochs, batch 8–16, evaluate ROUGE on validation each epoch with generation switched on. Use a GPU; mixed precision bf16 if available. Keep the best checkpoint.
Builds on: 3.5 Fine-tune the Transformer