app.py

from datasets import load_dataset
from transformers import AutoTokenizer, AutoModelForSeq2SeqLM, TrainingArguments, Trainer, DataCollatorForSeq2Seq

# Load dataset
data = load_dataset("json", data_files="expanded_dataset_570.json", split='train')
data = data.train_test_split(test_size=0.1, seed=42)

# Load model/tokenizer
model_id = "google/flan-t5-base"
tokenizer = AutoTokenizer.from_pretrained(model_id)
model = AutoModelForSeq2SeqLM.from_pretrained(model_id)

# Format
def format(example):
    prompt = f"### Instruction:\n{example['instruction']}\n\n### Input:\n{example['input']}\n\n### Response:\n"
    inputs = tokenizer(prompt, padding="max_length", truncation=True, max_length=512)
    targets = tokenizer(example["output"], padding="max_length", truncation=True, max_length=128)
    inputs["labels"] = targets["input_ids"]
    return inputs

tokenized_data = data.map(format)

# Training config
args = TrainingArguments(
    output_dir="./results",
    per_device_train_batch_size=2,
    learning_rate=2e-5,
    num_train_epochs=5,
    warmup_steps=50,
    lr_scheduler_type="linear",
    logging_steps=10,
    evaluation_strategy="steps",
    eval_steps=100,
    save_total_limit=2,
    report_to="none"
)

collator = DataCollatorForSeq2Seq(tokenizer, model=model)

trainer = Trainer(
    model=model,
    args=args,
    train_dataset=tokenized_data["train"],
    eval_dataset=tokenized_data["test"],
    data_collator=collator,
)

trainer.train()

# Push to Hugging Face Hub
model.push_to_hub("your-username/flan-t5-chatbot")
tokenizer.push_to_hub("your-username/flan-t5-chatbot")