Example Training Script

This page provides a full working example of using the Transformer Lab Client for fine-tuning a language model. The example demonstrates the entire workflow from initialization to model saving, with proper progress reporting and error handling.

Overview

This example demonstrates how to:

1. Initialize a Transformer Lab client and register a training job
2. Load and process a dataset for language model fine-tuning
3. Configure and train a model using Hugging Face Transformers
4. Report progress and metrics to Transformer Lab
5. Handle errors and completion properly

Prerequisites

• transformerlab-client
• transformers
• datasets
• torch
• A running Transformer Lab server

Complete Example Script

Below is the complete example script for fine-tuning a small language model on instruction data:

import os
from datetime import datetime
from pprint import pprint

from datasets import load_dataset
from transformerlab_client.callbacks.hf_callback import TLabProgressCallback
from transformerlab_client.client import TransformerLabClient
from transformers import (
    AutoModelForCausalLM,
    AutoTokenizer,
    DataCollatorForLanguageModeling,
    Trainer,
    TrainingArguments,
)


def train():
    """Main training function that runs locally but reports to TransformerLab"""

    # Training configuration
    training_config = {
        "experiment_name": "alpha",
        "model_name": "HuggingFaceTB/SmolLM-135M-Instruct",
        "dataset": "Trelis/touch-rugby-rules",
        "template_name": "full-demo",
        "output_dir": "./output",
        "log_to_wandb": False,
        "_config": {
            "dataset_name": "Trelis/touch-rugby-rules",
            "lr": 2e-5,
            "num_train_epochs": 1,
            "batch_size": 8,
            "gradient_accumulation_steps": 1,
            "warmup_ratio": 0.03,
            "weight_decay": 0.01,
            "max_seq_length": 512,
        },
    }

    # Initialize TransformerLab client
    tlab_client = TransformerLabClient()
    job_id = tlab_client.start(training_config)

    # Create output directory if it doesn't exist
    os.makedirs(training_config["output_dir"], exist_ok=True)

    try:
        # Log start time
        start_time = datetime.now()
        tlab_client.log_info(f"Training started at {start_time}")

        # Load the dataset
        tlab_client.log_info("Loading dataset...")
        dataset = load_dataset(training_config["dataset"])
        tlab_client.log_info(f"Loaded dataset with {len(dataset['train'])} training examples")

        # Report progress to TransformerLab
        tlab_client.report_progress(10, {"status": "dataset_loaded"})

        # Load tokenizer and model
        tlab_client.log_info(f"Loading model: {training_config['model_name']}")
        tokenizer = AutoTokenizer.from_pretrained(training_config["model_name"])
        model = AutoModelForCausalLM.from_pretrained(
            training_config["model_name"],
            device_map="auto",
        )

        # Configure tokenizer
        if not tokenizer.pad_token_id:
            tokenizer.pad_token = tokenizer.eos_token

        # Report progress
        tlab_client.report_progress(20, {"status": "model_loaded"})

        # Process dataset
        def format_instruction(example):
            """Format instruction and response using template"""
            instruction = example["prompt"]
            response = example["completion"]

            # Simple Llama-3 instruction template
            if training_config["template_name"] == "llama3instruct":
                formatted = f"<|begin_of_text|><|prompt|>{instruction}<|response|>{response}<|end_of_text|>"
            else:
                # Default simple template
                formatted = f"Instruction: {instruction}\n\nResponse: {response}"

            return {"formatted_text": formatted}

        tokenized_dataset = dataset.map(format_instruction)

        # Tokenize dataset
        def tokenize_function(examples):
            return tokenizer(
                examples["formatted_text"],
                padding="max_length",
                truncation=True,
                max_length=training_config["_config"]["max_seq_length"],
                return_tensors="pt",
            )

        processed_dataset = tokenized_dataset.map(
            tokenize_function, batched=True, remove_columns=tokenized_dataset["train"].column_names
        )

        # Report progress
        tlab_client.report_progress(30, {"status": "dataset_processed"})

        # Setup training arguments
        training_args = TrainingArguments(
            output_dir=os.path.join(training_config["output_dir"], f"job_{job_id}"),
            learning_rate=training_config["_config"]["lr"],
            num_train_epochs=training_config["_config"]["num_train_epochs"],
            per_device_train_batch_size=training_config["_config"]["batch_size"],
            gradient_accumulation_steps=training_config["_config"]["gradient_accumulation_steps"],
            warmup_ratio=training_config["_config"]["warmup_ratio"],
            weight_decay=training_config["_config"]["weight_decay"],
            logging_steps=20,
            save_steps=500,
            save_total_limit=2,
            report_to=[],  # We'll handle reporting to TransformerLab ourselves
        )

        # Setup trainer
        trainer = Trainer(
            model=model,
            args=training_args,
            train_dataset=processed_dataset["train"],
            data_collator=DataCollatorForLanguageModeling(tokenizer=tokenizer, mlm=False),
            callbacks=[TLabProgressCallback(tlab_client)],
        )

        # Train the model
        tlab_client.log_info("Starting training...")
        trainer.train()

        # Save the final model
        tlab_client.log_info("Saving model...")
        trainer.save_model(os.path.join(training_config["output_dir"], f"final_model_{job_id}"))
        tokenizer.save_pretrained(os.path.join(training_config["output_dir"], f"final_model_{job_id}"))
        tlab_client.log_info("Saving model in Transformer Lab")
        tlab_client.save_model(os.path.join(training_config["output_dir"], f"final_model_{job_id}"))

        # Calculate training time
        end_time = datetime.now()
        training_duration = end_time - start_time
        tlab_client.log_info(f"Training completed in {training_duration}")

        # Complete the job in TransformerLab
        tlab_client.complete()

        return {
            "status": "success",
            "job_id": job_id,
            "duration": str(training_duration),
            "output_dir": os.path.join(training_config["output_dir"], f"final_model_{job_id}"),
        }

    except KeyboardInterrupt:
        tlab_client.log_warning("Training interrupted by user or remotely")
        tlab_client.stop("Training stopped by user or remotely")
        return {"status": "stopped", "job_id": job_id}

    except Exception as e:
        tlab_client.log_error(f"Training failed: {str(e)}")
        import traceback

        traceback.print_exc()
        tlab_client.stop(f"Training failed: {str(e)}")
        return {"status": "error", "job_id": job_id, "error": str(e)}


if __name__ == "__main__":
    result = train()
    pprint(result)

Explanation

Let's break down the key components of this example:

1. Training Configuration

The script starts by defining a configuration dictionary with all the necessary parameters for training:

training_config = {
    "experiment_name": "alpha",
    "model_name": "HuggingFaceTB/SmolLM-135M-Instruct",
    "dataset": "Trelis/touch-rugby-rules",
    "template_name": "full-demo",
    "output_dir": "./output",
    "log_to_wandb": False,
    "_config": {
        "dataset_name": "Trelis/touch-rugby-rules",
        "lr": 2e-5,
        "num_train_epochs": 1,
        "batch_size": 8,
        "gradient_accumulation_steps": 1,
        "warmup_ratio": 0.03,
        "weight_decay": 0.01,
        "max_seq_length": 512,
    },
}

This configuration contains:

• Basic experiment information (name, model, dataset)
• Output directory for saving results
• Training hyperparameters in the _config nested dictionary

2. Client Initialization

The script initializes the TransformerLab client and registers a new training job:

tlab_client = TransformerLabClient()
job_id = tlab_client.start(training_config)

The start() method registers the job with Transformer Lab and returns a unique job ID.

3. Progress Reporting

Throughout the script, progress is reported at key milestones:

# Manual progress reporting at key points
tlab_client.report_progress(10, {"status": "dataset_loaded"})
tlab_client.report_progress(20, {"status": "model_loaded"})
tlab_client.report_progress(30, {"status": "dataset_processed"})

Progress values are percentages (0-100) and can include additional metrics as a dictionary.

4. Logging

The client provides various logging methods to keep track of events:

tlab_client.log_info("Loading dataset...")
tlab_client.log_info(f"Loaded dataset with {len(dataset['train'])} training examples")

These logs appear both in the console and in the Transformer Lab interface.

5. Callback Integration

The script uses the TLabProgressCallback to automatically report progress during training:

trainer = Trainer(
    model=model,
    args=training_args,
    train_dataset=processed_dataset["train"],
    data_collator=DataCollatorForLanguageModeling(tokenizer=tokenizer, mlm=False),
    callbacks=[TLabProgressCallback(tlab_client)],  # Add the callback here
)

This callback automatically updates progress based on the training steps without requiring manual progress calls during the training loop.

6. Error Handling

The script includes comprehensive error handling to ensure that TransformerLab is properly updated if an error occurs:

except KeyboardInterrupt:
    tlab_client.log_warning("Training interrupted by user or remotely")
    tlab_client.stop("Training stopped by user or remotely")
    return {"status": "stopped", "job_id": job_id}

except Exception as e:
    tlab_client.log_error(f"Training failed: {str(e)}")
    import traceback

    traceback.print_exc()
    tlab_client.stop(f"Training failed: {str(e)}")
    return {"status": "error", "job_id": job_id, "error": str(e)}

This ensures that the job is properly marked as stopped or failed in Transformer Lab if something goes wrong.

7. Completion and Model Saving

When training completes successfully, the model is saved and the job is marked as complete:

# Save the model locally
trainer.save_model(os.path.join(training_config["output_dir"], f"final_model_{job_id}"))
tokenizer.save_pretrained(os.path.join(training_config["output_dir"], f"final_model_{job_id}"))

# Notify Transformer Lab about the saved model
tlab_client.save_model(os.path.join(training_config["output_dir"], f"final_model_{job_id}"))

# Mark job as complete
tlab_client.complete()

Running the Example

To run this example:

1. Make sure Transformer Lab is running
2. Install the required packages:

   pip install transformerlab-client transformers datasets torch
3. Save the script to a file (e.g., train_with_tlab.py)
4. Run the script:

   python train_with_tlab.py

You can monitor the progress in the Transformer Lab interface, where you'll see real-time updates of progress, metrics, and logs.

Additional Tips

• Template Customization: Modify the format_instruction function to use different chat templates for other models
• Dataset Customization: Replace load_dataset() with your own dataset loading logic if needed
• Configuration: Customize the training_config dictionary to suit your specific needs
• Error Handling: Add more specific error handling for your use case

This example serves as a starting point that you can adapt for your own model training workflows.