PodcastsLatent Space: The AI Engineer Podcast — Practitioners talking LLMs, CodeGen, Agents, Multimodality, AI UX, GPU Infra and all things Software 3.0How to train your own Large Multimodal Model — with Hugo Laurençon & Leo Tronchon of HuggingFace M4

How to train your own Large Multimodal Model — with Hugo Laurençon & Leo Tronchon of HuggingFace M4
Latent Space: The AI Engineer Podcast — Practitioners talking LLMs, CodeGen, Agents, Multimodality, AI UX, GPU Infra and all things Software 3.0Fri Jan 19 2024
Creation of Idefix Multimodal Model:
- Hugo and Leo from Hugging Face meticulously developed the Idefix multimodal model, aiming to replicate DeepMind's Flamingo model with 80 billion parameters while keeping it open-source.
- The team spent significant time refining the data pipeline by cleaning HTML codes, selecting essential nodes, deduplicating data, and ensuring high-quality text and images in the Obelix dataset.
- Initial phases involved exploring various approaches for around one month before committing two months to tasks like downloading images, processing scripts, and curating high-quality data for training.
Importance of Dataset Quality and Processing:
- Thorough curation was vital to maintain quality metrics such as perplexity evaluations and ensure alignment between image-text pairs within datasets.
- Quantitative measurement using perplexity scores helped assess dataset quality by calculating probabilities of document sequences normalized by length compared against CIFAR for text quality evaluation.
- Cleaning raw HTML tags manually was crucial to establish robust datasets suitable for effective training of multimodal models.
Challenges Faced During Training:
- Instabilities during training necessitated frequent checkpoints every 250 steps and occasional restarts due to early issues encountered during the process.
- Overcoming instability challenges required implementing techniques like query key layer norms that significantly aided in stabilizing the large Idefix model during training.
Potential of Synthetic Data in Multimodality:
- Synthetic data augmentation methods showed promise in enhancing performance with less data through generating synthetic captions or visual element-aligned augmentations.
- Leveraging synthetic data for foundation multimodal model training demonstrated potential for improving capabilities without extensive original data requirements.
Future Directions and Considerations:
- Exploring open-source augmented datasets can offer valuable resources for further advancing efficiency in multimodal model training processes.
- Continued research into optimizing data pipelines is critical for driving advancements in multimodal AI applications while addressing challenges related to modality alignment accuracy.
Training Large Multimodal Models:
- Addressing model instability in training large multimodal models involves normalizing queries and keys to prevent performance issues.
- Regularization techniques are crucial when parameters become too large, necessitating identification of problematic parameters for regularization.
- Debugging instabilities is challenging due to various factors like data quality, model size, and hyperparameters affecting the model's behavior.
Challenges with Model Instabilities:
- Hallucinations in multimodal models lead to incorrect outputs such as misinterpreting object attributes or environments in images.
- Categorizing hallucinations helps target missing data or fine-tuning needs for improved model performance.
- Evaluating hallucinations against closed-source models remains qualitative due to limitations in current evaluation benchmarks.
- Reinforcement learning with human feedback could enhance the model's understanding of uncertainty and address hallucination issues effectively.
Importance of Open Source Multimodal Models:
- Open source multimodal models serve as a foundational backbone for tasks requiring an understanding of visual and text data across various applications.
- These models offer better capabilities for robotics, medicine, image recognition, and everyday scenarios compared to text-only models.
- Future advancements may include incorporating video inputs but face challenges related to compute intensity and dataset complexities.