MOON3.0: Reasoning-aware Multimodal Representation Learning for E-commerce Product Understanding

TL;DR

MOON3.0 is a reasoning-aware multimodal model designed for detailed product understanding in e-commerce, leveraging novel modules and learning strategies to improve fine-grained attribute modeling.

Contribution

It introduces MOON3.0, the first reasoning-aware MLLM for product representation, with modules for adaptive fusion, autonomous reasoning, and detail preservation.

Findings

Achieves state-of-the-art zero-shot performance on multiple datasets.

Effectively models fine-grained product attributes.

Outperforms existing models in product understanding tasks.

Abstract

With the rapid growth of e-commerce, exploring general representations rather than task-specific ones has attracted increasing attention. Although recent multimodal large language models (MLLMs) have driven significant progress in product understanding, they are typically employed as feature extractors that implicitly encode product information into global embeddings, thereby limiting their ability to capture fine-grained attributes. Therefore, we argue that leveraging the reasoning capabilities of MLLMs to explicitly model fine-grained product attributes holds significant potential. Nevertheless, achieving this goal remains non-trivial due to several key challenges: (i) long-context reasoning tends to dilute the model's attention to salient information in the raw input; (ii) supervised fine-tuning (SFT) primarily encourages rigid imitation, limiting the exploration of effective reasoning strategies; and (iii) fine-grained details are progressively attenuated during forward propagation. To address these issues, we propose MOON3.0, the first reasoning-aware MLLM-based model for product representation learning. Our method (1) employs a multi-head modality fusion module to adaptively integrate raw signals; (2) incorporates a joint contrastive and reinforcement learning framework to autonomously explore more effective reasoning strategies; and (3) introduces a fine-grained residual enhancement module to progressively preserve local details throughout the network. Additionally, we release a large-scale multimodal e-commerce benchmark MBE3.0. Experimentally, our model demonstrates state-of-the-art zero-shot performance across various downstream tasks on both our benchmark and public datasets.