from datasets import load_dataset
from transformers import TrainingArguments
from span_marker import SpanMarkerModel, Trainer


def main() -> None:
    # Load the dataset, ensure "tokens" and "ner_tags" columns, and get a list of labels
    train_dataset = load_dataset("P3ps/Cross_ner", split="train")
    test_dataset = load_dataset("P3ps/Cross_ner", split="test")
    labels = train_dataset.features["ner_tags"].feature.names

    # Initialize a SpanMarker model using a pretrained BERT-style encoder
    model_name = "bert-base-uncased"
    model = SpanMarkerModel.from_pretrained(
        model_name,
        labels=labels,
        # SpanMarker hyperparameters:
        model_max_length=256,
        marker_max_length=128,
        entity_max_length=8,
    )

    # Prepare the 🤗 transformers training arguments
    args = TrainingArguments(
        output_dir=f"models/span_marker_bert_base_uncased_cross_ner",
        run_name=f"bbu_cross_ner",
        # Training Hyperparameters:
        learning_rate=5e-5,
        per_device_train_batch_size=32,
        per_device_eval_batch_size=32,
        num_train_epochs=3,
        weight_decay=0.01,
        warmup_ratio=0.1,
        bf16=True,  # Replace `bf16` with `fp16` if your hardware can't use bf16.
        # Other Training parameters
        logging_first_step=True,
        logging_steps=50,
        evaluation_strategy="steps",
        save_strategy="steps",
        eval_steps=200,
        save_total_limit=2,
        dataloader_num_workers=2,
    )

    # Initialize the trainer using our model, training args & dataset, and train
    trainer = Trainer(
        model=model,
        args=args,
        train_dataset=train_dataset,
        eval_dataset=test_dataset,
    )
    trainer.train()
    trainer.save_model(f"models/span_marker_bert_base_uncased_cross_ner/checkpoint-final")

    # Compute & save the metrics on the test set
    metrics = trainer.evaluate(test_dataset, metric_key_prefix="test")
    trainer.save_metrics("test", metrics)
    trainer.create_model_card()


if __name__ == "__main__":
    main()