2505.17507

# Benchmarking Recommendation, Classification, and Tracing Based on Hugging Face Knowledge Graph **Authors**: Qiaosheng Chen, Kaijia Huang, Xiao Zhou, Weiqing Luo, Yuanning Cui, Gong Cheng > 0009-0002-0610-7725 Nanjing University State Key Laboratory for Novel Software Technology Nanjing Jiangsu China > 0009-0004-0359-7946 Nanjing University State Key Laboratory for Novel Software Technology Nanjing Jiangsu China > 0009-0008-1132-6408 Nanjing University State Key Laboratory for Novel Software Technology Nanjing Jiangsu China > 0009-0004-8041-3258 Nanjing University State Key Laboratory for Novel Software Technology Nanjing Jiangsu China > 0000-0002-9113-0155 Nanjing University State Key Laboratory for Novel Software Technology Nanjing Jiangsu China > 0000-0003-3539-7776 Nanjing University State Key Laboratory for Novel Software Technology Nanjing Jiangsu China (2025) ## Abstract The rapid growth of open source machine learning (ML) resources, such as models and datasets, has accelerated IR research. However, existing platforms like Hugging Face do not explicitly utilize structured representations, limiting advanced queries and analyses such as tracing model evolution and recommending relevant datasets. To fill the gap, we construct $\mathsf{HuggingKG}$ , the first large-scale knowledge graph built from the Hugging Face community for ML resource management. With 2.6 million nodes and 6.2 million edges, $\mathsf{HuggingKG}$ captures domain-specific relations and rich textual attributes. It enables us to further present $\mathsf{HuggingBench}$ , a multi-task benchmark with three novel test collections for IR tasks including resource recommendation, classification, and tracing. Our experiments reveal unique characteristics of $\mathsf{HuggingKG}$ and the derived tasks. Both resources are publicly available, expected to advance research in open source resource sharing and management. journalyear: 2025 copyright: acmlicensed conference: Proceedings of the 48th International ACM SIGIR Conference on Research and Development in Information Retrieval; July 13–18, 2025; Padua, Italy booktitle: Proceedings of the 48th International ACM SIGIR Conference on Research and Development in Information Retrieval (SIGIR ’25), July 13–18, 2025, Padua, Italy doi: 10.1145/3726302.3730277 isbn: 979-8-4007-1592-1/2025/07 ## 1. Introduction The proliferation of open source models and datasets has empowered researchers and developers to build on existing AI tools, driving innovation across diverse domains. It also highlights the critical role of resource sharing platforms in the advancement of AI research, which requires efficient frameworks to share, search, and manage software resources to ensure equitable access and foster collaboration (Longpre et al., 2024; Chapman et al., 2020; Paton et al., 2023; Cao et al., 2021; Liu et al., 2023). In this context, Hugging Face has emerged as a popular platform, democratizing access to cutting-edge ML resources and allowing users to find open models and datasets. Motivation. Existing platforms for open source resource sharing, such as GitHub and Hugging Face, rely primarily on keyword-based search and simplistic metadata tagging (Lhoest et al., 2021). Although these platforms provide access to vast collections of models and datasets, they do not leverage semantic relations (e.g., model evolution, task dependencies, and user collaboration patterns) between resources during searches. As a result, they are unable to integrate structural information to recommend and manage resources effectively. This unstructured paradigm severely limits support for advanced queries and analyses, such as tracing a model’s evolution history, identifying relevant datasets for a specific task, or recommending underutilized resources based on structural dependencies. <details> <summary>x1.png Details</summary>  ### Visual Description ## Diagram: Hugging Face Ecosystem Workflow ### Overview The diagram illustrates a three-stage workflow for model development and deployment within the Hugging Face ecosystem. It connects foundational elements (models, datasets, users) to advanced applications (resource recommendation, task classification, model tracing) through intermediate knowledge graphs and fine-tuning processes. ### Components/Axes #### Key Elements: 1. **Hugging Face (Left Section)** - **Icons/Labels**: - `model` (3D cube), `dataset` (database), `space` (4-colored squares), `collection` (folder), `user` (person icon), `organization` (building), `task` (notebook), `paper` (document). - **Flow**: Arrows point to `HuggingKG` (center) with labels like `publish`, `define for`, `trained on`, and `contain`. 2. **HuggingKG (Center Section)** - **Models/Datasets**: - `BERT` (pre-training), `ex3ERT` (space), `medBERT` (model), `PubMed` (dataset). - **Relationships**: - `trained on` (BERT → BookCorpus), `fine-tune` (ex3ERT → medBERT), `trained on` (medBERT → PubMed). - **Icons**: Sesame Street characters (Bert, Ernie) represent model spaces. 3. **HuggingBench (Right Section)** - **Three Stages**: 1. **Resource Recommendation**: User (`Bob`) interacts with `dataset`/`model` via `like?`. 2. **Task Classification**: `dataset` → `define for` → `task` (notebook). 3. **Model Tracing**: `dataset` → `fine-tune` → `model` (3D cube). #### Arrows and Relationships: - **HuggingKG**: - `Google` (organization) → `Fill-Mask` (task) → `Wikipedia` (dataset). - `BERT` (model) → `BookCorpus` (dataset). - **HuggingBench**: - `like?` (heart icon) → `dataset`/`model`. - `define for` → `task` (notebook). - `fine-tune` → `model` (3D cube). ### Detailed Analysis - **Textual Labels**: - All labels are in English. No non-English text detected. - Critical labels include: - `BERT: Pre-training of ... (Paper)` (top-center). - `ex3ERT (Space)` (center-right). - `medBERT (Model)` (center-right). - `PubMed (Dataset)` (bottom-right). - **Flow Direction**: - Left (Hugging Face) → Center (HuggingKG) → Right (HuggingBench). - Arrows indicate dependencies (e.g., `trained on`, `fine-tune`). ### Key Observations 1. **Modular Design**: - HuggingKG acts as a bridge between raw data (Hugging Face) and applied workflows (HuggingBench). 2. **User-Centric Workflow**: - Users (`Bob`, `Jack`) drive model selection and fine-tuning via interactions (`like?`, `follow`). 3. **Data Provenance**: - Datasets like `BookCorpus` and `PubMed` are explicitly linked to models (`BERT`, `medBERT`). 4. **Sesame Street Imagery**: - Characters (Bert, Ernie) symbolize model spaces, adding a playful layer to technical concepts. ### Interpretation The diagram represents a **knowledge graph-driven pipeline** for NLP model development. HuggingKG formalizes relationships between models, datasets, and tasks, enabling scalable fine-tuning (e.g., `medBERT` for biomedical tasks). HuggingBench operationalizes this knowledge by: 1. Recommending resources based on user preferences (`like?`). 2. Classifying tasks to match datasets (`define for`). 3. Tracing model evolution via fine-tuning (`fine-tune`). The use of Sesame Street characters suggests an emphasis on **accessibility** and **modularity**, making complex workflows intuitive. The absence of numerical data implies the diagram prioritizes **conceptual relationships** over quantitative metrics. </details> Figure 1. Illustration of $\mathsf{HuggingKG}$ and $\mathsf{HuggingBench}$ . Knowledge graphs (KGs) offer a proven solution to this limitation. By explicitly representing entities as nodes and connecting them with edges representing typed relations, KGs enable sophisticated querying and analysis, as demonstrated in domains such as encyclopedias (Vrandecic and Krötzsch, 2014), academia (Zhang et al., 2019) and e-commerce (Ni et al., 2019). In the context of resource management, a structured KG can unify separated metadata, resource dependencies, and user interactions into a single heterogeneous graph. This representation supports complex tasks such as recommendation (Cao et al., 2021; Liu et al., 2023; Shao et al., 2020), link prediction (Bai et al., 2024), and node classification (Zhang et al., 2024). Therefore, our work aims to transform resource sharing platforms into KGs that enhance discovery, reproducibility, and management of open source resources. Our Resources. We construct two foundational resources as illustrated in Figure 1: $\mathsf{HuggingKG}$ , a large-scale ML resource KG built on the Hugging Face community, and $\mathsf{HuggingBench}$ , a multi-task benchmark designed to evaluate practical challenges in open source resource management. With more than 2.6 million nodes and 6.2 million triples, $\mathsf{HuggingKG}$ represents the largest publicly available KG in this domain (to our best knowledge). It integrates ML-related entities (e.g., Model, Dataset, User, Task) with ML-specific relations such as model evolution (e.g., Adapter, Finetune) and user interactions (e.g., Like, Follow), while incorporating rich textual attributes (e.g., extended descriptions). $\mathsf{HuggingBench}$ includes the first cross-type resource recommendation test collection in the ML resource domain and the first model tracing test collection, novel domain-specific tasks that existing benchmarks cannot support. We analyze the unique properties of $\mathsf{HuggingKG}$ and perform extensive evaluations with $\mathsf{HuggingBench}$ to reveal their special characteristics, which differ from traditional KGs or tasks in domains such as encyclopedias, academia, or e-commerce. The main contributions of this work are as follows. - $\mathsf{HuggingKG}$ : The first KG for ML resources on Hugging Face, featuring the largest scale among comparable works, and uniquely capturing domain-specific relations related to model evolution and user interaction as well as rich textual attributes. - $\mathsf{HuggingBench}$ : A new multi-task benchmark including novel test collections for cross-type resource recommendation, task classification, and model lineage tracing, addressing unmet needs in open source resource management. Availability. $\mathsf{HuggingKG}$ and $\mathsf{HuggingBench}$ are available on Hugging Face. https://huggingface.co/collections/cqsss/huggingbench-67b2ee02ca45b15e351009a2 The code for constructing $\mathsf{HuggingKG}$ and reproducing the experiments is available on GitHub. https://github.com/nju-websoft/HuggingBench Both resources are licensed under Apache License 2.0. ## 2. Related Work KGs for Resource Management. KGs have been extensively used to represent and analyze complex relationships in various domains, including open source resource management. Previous works such as DEKR (Cao et al., 2021) and MLTaskKG (Liu et al., 2023) have constructed KGs to support recommendation tasks by capturing relationships among ML resources. DEKR (Cao et al., 2021) primarily relies on description enhancement for ML method recommendation. MLTaskKG (Liu et al., 2023) constructs an AI task-model KG by integrating static data to support task-oriented ML/DL library recommendation. However, both approaches focus on static attributes and a narrow set of relations, failing to capture dynamic user interactions and inter- Model relations. In contrast, as shown in Table 1, our proposed $\mathsf{HuggingKG}$ is built on the rich metadata provided by Hugging Face, offering a large-scale KG with a more extensive set of relations. In addition to generic relations (e.g., Defined For, Cite), $\mathsf{HuggingKG}$ incorporates multiple inter- Model relations (i.e., Adapter, Finetune, Merge, and Quantize) and captures user interaction signals (i.e., Publish, Like, and Follow). This enriched structure facilitates a deeper analysis of ML resources and supports more effective recommendation strategies. KG-based Benchmarks. Various benchmark datasets have been proposed to evaluate KG-based tasks. For example, OAG-Bench (Zhang et al., 2024) provides a human-curated benchmark for academic graph mining, focusing on citation and collaboration networks. In the domain of open source resource management, our $\mathsf{HuggingBench}$ benchmark distinguishes itself by providing datasets for three IR tasks: resource recommendation, task classification, and model tracing. For resource recommendation, paper2repo (Shao et al., 2020) introduces a distant-supervised recommender system that matches papers with related code repositories. However, it incorporates a limited range of entity types that are insufficient to build fine-grained interdependencies. Xu et al. (Xu et al., 2023) leverages multi-modal features from developers’ sequential behaviors and repository text to generate relevant and tailored suggestions for developers, yet it does not explicitly construct or exploit a structured KG. In contrast, as shown in Table 1, $\mathsf{HuggingBench}$ benefits from the inherent structure of $\mathsf{HuggingKG}$ that captures rich relational data for recommendation. Furthermore, GRETA (Cai et al., 2016) and recent efforts in automated categorization (Sipio et al., 2024; Nguyen et al., 2024) address specific tagging/classification tasks. GRETA (Cai et al., 2016) constructs an Entity Tag Graph (ETG) using the cross-community knowledge from GitHub and Stack Overflow, and uses an iterative random walk with restart algorithm to automatically assign tags to repositories. $\mathsf{HuggingKG}$ integrates richer textual descriptions and metadata to construct a graph that encapsulates fine-grained relationships among models and datasets, thereby facilitating multi-label task classification for ML resources. Table 1. Comparison between KGs and benchmarks on open source resource management. | | Source | #Nodes | #Types | #Relations | #Edges | Key Entities & (Attributes) | Model Evolution | User Interaction | Tasks | | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | | DEKR (Cao et al., 2021) | Open academic platforms (e.g., PapersWithCode, GitHub) | 17,483 | 5 | 23 | 117,245 | Dataset, Method (Description) | No | No | Recommendation | | MLTaskKG (Liu et al., 2023) | PapersWithCode, ML/DL Papers, ML/DL Framework Docs | 159,310 | 16 | 39 | 628,045 | Task, Model, Model Implementation | No | No | Recommendation | | paper2repo (Shao et al., 2020) | GitHub, Microsoft Academic | 39,600 | 2 | - | - | Paper, Repository | No | Yes (Star) | Recommendation | | GRETA (Cai et al., 2016) | GitHub, Stack Overflow | 707,891 | 4 | - | - | Repository, Tag | No | Yes (Search, Raise, Answer) | Tag Assignment | | AIPL(Facebook/React) (Bai et al., 2024) | GitHub | 97,556 | 4 | 9 | 196,834 | Issue, PR, Repository, User | No | Yes | Issue-PR Link Prediction | | AIPL(vuejs/vue) (Bai et al., 2024) | GitHub | 49,200 | 4 | 9 | 95,160 | Issue, PR, Repository, User | No | Yes | Issue-PR Link Prediction | | $\mathsf{HuggingKG}$ & $\mathsf{HuggingBench}$ | Hugging Face | 2,614,270 | 8 | 30 | 6,246,353 | Model, Dataset, User, Task (Description) | Yes (Finetune, Adapter, Merge, Quantize) | Yes (Publish, Like, Follow) | Recommendation, Classification, Tracing | Recent work by Bai et al. (Bai et al., 2024) uses a knowledge-aware heterogeneous graph learning approach to predict links between issues and pull requests on GitHub, effectively capturing complex relational information through metapath aggregation. However, it remains confined to linking Issue – PR pairs and does not address the broader challenge of tracking model evolution across ML resources. The novel model tracing task in $\mathsf{HuggingBench}$ not only pioneers the exploration of inter- Model relations, but also provides practical insights into the evolution, reuse, and optimization of ML models, thereby supporting more informed decision-making in real-world open source resource management. ## 3. $\mathsf{HuggingKG}$ Knowledge Graph ### 3.1. KG Construction The construction of $\mathsf{HuggingKG}$ follows a principled process that includes defining nodes and edges, crawling and converting data from the Hugging Face community website, and performing data verification and cleaning. Schema Definition. The nodes and edges in $\mathsf{HuggingKG}$ are defined based on our meticulous analysis of the Hugging Face website and general IR needs in real-world scenarios. Figure 2 shows an example model page of $\mathtt{Qwen/Qwen2.5\text{-}7B\text{-}Instruct}$ https://huggingface.co/Qwen/Qwen2.5-7B-Instruct on the Hugging Face website. We can intuitively see that the key attributes of a Model include its name, publisher, tags, and text description on the model card, etc. The key relations that can be observed on the page include Finetune between Model s and Like between User and Model, etc. <details> <summary>x2.png Details</summary>  ### Visual Description ## Screenshot: Qwen2.5-7B-Instruct Model Information Page ### Overview This image depicts a technical documentation page for the Qwen2.5-7B-Instruct large language model. The page includes metadata, model relationships, performance metrics, and a visual representation of download trends. Key elements include model descriptions, relational tags, and a model tree hierarchy. ### Components/Axes #### Header Section - **Model Publisher/Model Name**: Qwen/Qwen2.5-7B-Instruct - **User-Model Relations**: - Likes: 494 - Follows: 15.6k - **User-Organization Relations**: Not explicitly detailed - **Model-Task Relations**: Text Generation, Transformers, Safetensors, English, Chat, Conversational - **Model-Paper Relations**: arXiv:2309.00071, arXiv:2407.10671 - **License**: Apache-2.0 #### Model Description Section - **Model Tags**: Text-generation-inference, Chat, Conversational - **Model Description**: - Qwen2.5 is the latest series of Qwen large language models. - Base models range from 0.5B to 72B parameters. - Improvements over Qwen2 include enhanced coding and mathematics capabilities. #### Model Tree Section - **Base Model**: Qwen/Qwen2.5-7B-Instruct (7.62B parameters) - **Finetuned Models**: 212 (highlighted as "this model") - **Adapters**: 279 models - **Finetunes**: 431 models - **Merges**: 54 models - **Quantizations**: 141 models #### Spaces Using the Model - Eduagracia/open_pt_llm_leaderboard - Loggikon/open_cot_leaderboard #### Collection Section - **Collection Name**: Qwen2.5 - **Items**: 45 (partial text: "Qwen2.5 langua...") - **Unique Users**: 522 #### Download Trends - **Downloads Last Month**: 1,574,697 - **Line Graph**: Shows an upward trend with peaks and valleys (no exact data points provided). ### Detailed Analysis - **Model Size**: The base model is 7.62B parameters, with finetuned variants and derivatives. - **Relational Tags**: - **Model-Model Relation**: Hierarchical structure showing base model and derivatives. - **Space-Model Relation**: Leaderboard spaces using the model. - **Collection-Model Relation**: 45 items in the Qwen2.5 collection. - **License**: Apache-2.0 indicates open-source usage. ### Key Observations 1. **High Adoption**: 1.57M downloads last month suggest significant popularity. 2. **Model Ecosystem**: Over 1,000 derivatives (adapters, finetunes, merges, quantizations). 3. **User Engagement**: 15.6k follows and 494 likes indicate active community interest. 4. **Performance Focus**: Emphasis on coding and mathematics improvements. ### Interpretation The Qwen2.5-7B-Instruct model is part of a robust ecosystem with extensive community and organizational adoption. The Apache-2.0 license facilitates open-source contributions, while the model tree highlights its versatility through finetuning and quantization. The upward download trend implies growing interest, potentially driven by its specialized capabilities in coding and mathematics. However, the lack of granular download data (e.g., daily/weekly breakdowns) limits deeper trend analysis. The model’s focus on instruction-tuning and conversational use cases positions it for applications in chatbots and interactive systems. </details> Figure 2. An example model page on Hugging Face. Through an analysis of pages such as models, datasets, and spaces, we identify 8 types of nodes and 30 types of edges between them, as illustrated in Figure 3. In addition, we determine the key attributes associated with each node type. For Model, Dataset, Space, and Collection, we adopt the “publisher/name” format used by Hugging Face serving as the primary identifier. To address potential name duplication across different node types (e.g., a model https://huggingface.co/aai540-group3/diabetes-readmission and a dataset https://huggingface.co/datasets/aai540-group3/diabetes-readmission sharing the same “publisher/name”), we introduce a type prefix for each node. For example, a Model might be represented as $\mathtt{model:Qwen/Qwen2.5\text{-}7B\text{-}Instruct}$ , ensuring its uniqueness. This string is used as a unique identifier to detect and prevent duplication during subsequent data crawling and processing. Data Crawling and Conversion. The data crawling process is performed utilizing the huggingface_hub library https://huggingface.co/docs/hub/index and issuing requests to the relevant API endpoints. https://huggingface.co/docs/hub/api For Model, Dataset, and Space, we retrieve their complete lists, as well as their key attributes (e.g., tags, download count) and edges through functions in the huggingface_hub library. Specifically, to capture the complete README file for each Model or Dataset node, we send a request to download and parse the README.md file, storing its content as the description field in text format. The list of Collection and additional metadata for these four node types are obtained by batch API requests. <details> <summary>x3.png Details</summary>  ### Visual Description ## Network Diagram: Entity Relationships and Interaction Metrics ### Overview The image depicts a complex network diagram illustrating relationships between entities (nodes) and interactions (edges). Nodes represent entities like "User," "Model," "Dataset," and "Paper," while edges represent relationships such as "Publish," "Use," and "Contain." Each node and edge is labeled with numerical values and percentages, indicating their relative proportions within the system. ### Components/Axes - **Nodes**: - Labeled with entity names (e.g., "User," "Model," "Dataset") and associated values (e.g., "User (729,401 / 27.9%)"). - Colors: Red, green, blue, yellow, and gray. - **Edges**: - Labeled with relationship types (e.g., "Collection," "Defined For," "Use") and associated values (e.g., "Collection (79,543 / 3.0%)"). - Colors: Red, orange, green, blue, purple, and gray. - **Legend**: - Located on the right, mapping colors to relationship types (e.g., red = "Like," orange = "Publish," green = "Use"). - Includes 14 relationship types with percentages (e.g., "Like (1,967,016 / 31.5%)"). ### Detailed Analysis #### Nodes 1. **User**: 729,401 instances (27.9% of total). 2. **Organization**: 17,233 instances (0.7%). 3. **Space**: 307,789 instances (11.8%). 4. **Collection**: 79,543 instances (3.0%). 5. **Dataset**: 261,663 instances (10.0%). 6. **Paper**: 15,857 instances (0.6%). 7. **Task**: 52 instances (0.0%). 8. **Model**: 1,202,732 instances (46.0%). #### Edges 1. **Like**: 1,967,016 (31.5%). 2. **Publish**: 1,797,522 (28.8%). 3. **Defined For**: 570,584 (9.1%). 4. **Follow**: 476,367 (7.6%). 5. **Use**: 317,975 (5.1%). 6. **Cite**: 282,866 (4.5%). 7. **Contain**: 272,099 (4.4%). 8. **Adapter**: 155,642 (2.5%). 9. **Finetune**: 107,162 (1.7%). 10. **Trained Or Finetuned On**: 96,546 (1.5%). 11. **Own**: 79,542 (1.3%). 12. **Affiliated With**: 57,220 (0.9%). 13. **Quantize**: 45,809 (0.7%). 14. **Merge**: 20,003 (0.3%). ### Key Observations 1. **Dominant Entities**: - "Model" is the largest node (46.0%), followed by "User" (27.9%) and "Dataset" (10.0%). - "Task" has negligible presence (0.0%). 2. **Dominant Relationships**: - "Like" and "Publish" are the most frequent interactions (31.5% and 28.8%, respectively). - "Merge" is the least frequent (0.3%). 3. **Color Consistency**: - All edge colors match the legend (e.g., red edges correspond to "Like"). - Node colors vary but lack a clear legend mapping. ### Interpretation - **Central Role of Models**: The "Model" node's dominance (46.0%) suggests it is a core component of the system, likely serving as a hub for interactions like "Publish" and "Use." - **User-Driven Activity**: The "User" node's size (27.9%) and connections to "Model" and "Dataset" indicate users are primary actors driving interactions. - **High-Frequency Relationships**: "Like" and "Publish" dominate, implying these are foundational to the system's functionality (e.g., content sharing or collaboration). - **Anomalies**: - "Task" has no instances (0.0%), which may indicate incomplete data or a placeholder. - "Merge" is rare (0.3%), possibly reflecting a specialized or infrequent operation. - **Color Coding**: The legend provides clarity for edge relationships but lacks node color explanations, leaving their significance ambiguous. This diagram highlights a system where models and user interactions are central, with "Publish" and "Like" as key drivers. The low frequency of "Merge" and "Task" warrants further investigation into their roles or data completeness. </details> Figure 3. The schema graph of $\mathsf{HuggingKG}$ , along with the quantity and proportion of each node and edge type. The lists of User and Organization are extracted from the “publisher” fields of various nodes, including Model, Dataset, Space, Collection, and Paper. User and Organization nodes are distinguished by their profiles from the API endpoints, and edges such as Follow and Affiliated With are also captured. Paper nodes are identified through arxiv: tags present in Model, Dataset, and Collection nodes. Detailed metadata, such as title, abstract, publication date, and authorship, is retrieved through API calls. For authors registered as User, we established edges between User nodes and their associated Paper nodes. Task nodes are identified from three primary sources: “tasks” fields in Dataset, “pipeline tags” fields in Model, and direct definitions from the API. Edges between Task nodes and Model or Dataset nodes, are established by parsing metadata fields, allowing us to align models and datasets with the tasks they serve for. Data Verification and Cleaning. After data crawling is completed, we verify and clean all nodes and edges to ensure the accuracy and completeness of $\mathsf{HuggingKG}$ . The verification process involves scanning all collected edges and checking whether the nodes involved in each edge exist within the set of collected nodes. Some models may have been deleted by the publisher, but edges involving those models (e.g., a model finetuned from the original) may still appear on Web pages. If any invalid edges are detected, they are removed. The data cleaning process primarily focuses on eliminating outliers in node attributes and removing invalid characters from text fields. Time and Space Cost. To reduce time overhead, the construction process employs multi-threaded parallel processing at each step. Consequently, the entire process takes approximately 20 hours and the storage of node attributes and edges in the graph amounts to around 5.8 GB. This indicates that the graph can be updated daily. The current version of $\mathsf{HuggingKG}$ is constructed with data collected on December 15, 2024. <details> <summary>x4.png Details</summary>  ### Visual Description ## Heatmap: Model-Dataset Category Similarity ### Overview The image contains two side-by-side heatmaps comparing model and dataset category compatibility. Each panel uses a color gradient (0.00-1.00) to represent similarity scores between model categories (y-axis) and dataset categories (x-axis). The left panel focuses on "Model Category A" relationships, while the right panel examines "Dataset Category B" relationships. ### Components/Axes **Left Panel (Model Category A):** - **Y-axis (Model Category A):** Multimodal, NLP, CV, Audio, Tabular, RL, Graph, Robotics, Time Series - **X-axis (Model Category B):** Same categories as Y-axis - **Legend:** Color scale from 0.00 (light yellow) to 1.00 (dark blue) - **Title:** "Model Category A" **Right Panel (Dataset Category B):** - **Y-axis (Model Category A):** Same as left panel - **X-axis (Dataset Category B):** Multimodal, NLP, CV, Audio, Tabular, RL, Graph, Robotics, Time Series - **Legend:** Identical color scale to left panel - **Title:** "Dataset Category B" ### Detailed Analysis **Left Panel Patterns:** 1. **Diagonal Dominance:** Dark blue cells (1.00) along the diagonal confirm perfect category matching 2. **Strongest Cross-Category:** NLP-Audio (0.75) and CV-Tabular (0.75) show high similarity 3. **Weakest Links:** Graph-Robotics (0.00) and Robotics-Graph (0.00) indicate no compatibility **Right Panel Patterns:** 1. **Diagonal Consistency:** Maintains 1.00 scores for matching categories 2. **Notable Cross-Category:** RL-Time Series (0.50) and Graph-Robotics (0.50) show moderate compatibility 3. **Weakest Links:** Tabular-Audio (0.00) and Audio-Tabular (0.00) show no compatibility ### Key Observations 1. **Diagonal Dominance:** Both panels show perfect 1.00 scores along the diagonal, confirming optimal category matching 2. **Cross-Category Patterns:** - NLP demonstrates strongest cross-category performance (0.75 with Audio in left panel) - RL shows notable Time Series compatibility (0.50 in right panel) - Graph-Robotics relationship shows mutual 0.50 compatibility in right panel 3. **Zero-Compatibility Pairs:** - Graph-Robotics (left panel) - Tabular-Audio (right panel) - Robotics-Graph (left panel) ### Interpretation The heatmaps reveal a clear preference for category-matched model-dataset pairs, with diagonal dominance indicating optimal performance. However, several cross-category compatibilities suggest: 1. **Model Adaptability:** NLP's high Audio similarity (0.75) implies text models can handle audio data through feature extraction 2. **Temporal Relationships:** RL's 0.50 Time Series compatibility suggests reinforcement learning can handle sequential data with moderate effectiveness 3. **Structural Similarities:** Graph-Robotics 0.50 compatibility in the right panel indicates shared structural properties between these categories 4. **Data Type Barriers:** Zero scores for Tabular-Audio and Graph-Robotics in left panel highlight fundamental differences between tabular/audio and graph/robotics data types The consistent diagonal dominance across both panels emphasizes the importance of category alignment, while the notable cross-category scores suggest opportunities for transfer learning and multi-modal approaches. The absence of certain cross-category compatibilities (e.g., Graph-Robotics in left panel) indicates potential architectural limitations in handling fundamentally different data structures. </details> (a) $P(A|B)$ for within-type nodes. <details> <summary>x5.png Details</summary>  ### Visual Description ## Heatmap: Model-Dataset Category Performance Comparison ### Overview The image contains two side-by-side heatmaps comparing performance metrics between dataset categories (A/B) and model categories (A/B). Each matrix uses a color gradient from yellow (0.00) to dark blue (1.00) to represent performance scores. The left matrix compares Dataset Category A with Model Category B, while the right matrix compares Dataset Category B with Model Category B. ### Components/Axes **Left Matrix (Dataset A vs Model B):** - **Y-axis (Dataset Category A):** Multimodal, NLP, CV, Audio, Tabular, RL, Graph, Robotics, Time Series - **X-axis (Model Category B):** Multimodal, NLP, CV, Audio, Tabular, RL, Graph, Robotics, Time Series - **Color Legend:** Right side, gradient from yellow (0.00) to dark blue (1.00) **Right Matrix (Dataset B vs Model B):** - **Y-axis (Dataset Category B):** Same categories as left matrix - **X-axis (Model Category B):** Same categories as left matrix - **Color Legend:** Identical to left matrix ### Detailed Analysis **Left Matrix (Dataset A):** - **NLP Models:** Highest performance (dark blue) with NLP datasets (0.95-1.00) - **Multimodal Models:** Strong performance with NLP (0.85) and CV (0.75) datasets - **CV Models:** Best with CV datasets (0.80) and NLP (0.70) - **Robotics Models:** Moderate performance with Robotics datasets (0.60) - **Time Series Models:** Low performance (0.40-0.50) across most datasets **Right Matrix (Dataset B):** - **NLP Models:** Still highest with NLP datasets (0.75-0.85) - **Multimodal Models:** Reduced performance (0.60-0.70) compared to left matrix - **CV Models:** Lower scores (0.50-0.60) across all datasets - **Robotics Models:** Slight improvement (0.50) with Robotics datasets - **Time Series Models:** Minimal improvement (0.30-0.40) ### Key Observations 1. **NLP Dominance:** NLP models consistently show highest performance with NLP datasets in both matrices 2. **Performance Decline:** Right matrix shows 20-30% lower scores across all categories compared to left matrix 3. **Multimodal Strength:** Multimodal models perform best with NLP datasets in both matrices 4. **Robotics/Time Series:** Both categories show weak performance in Dataset B matrix 5. **Color Gradient:** Dark blue (high values) concentrated in NLP-related cells, yellow (low values) in Robotics/Time Series ### Interpretation The heatmaps demonstrate strong model-dataset alignment for NLP tasks, with NLP models achieving near-perfect scores (0.95-1.00) when paired with NLP datasets. The significant performance drop in Dataset B matrix suggests either: 1. Different data characteristics in Dataset B 2. More challenging evaluation metrics 3. Dataset B containing more complex or noisy data Notably, Multimodal models show consistent performance across both matrices, indicating robustness to dataset variations. The weak performance of Robotics and Time Series models across most datasets suggests these categories may require specialized architectures or additional feature engineering. The color gradient visualization effectively highlights the importance of matching model architecture to dataset type, with NLP being the most performant combination. The 20-30% performance gap between matrices emphasizes the critical role of dataset quality and characteristics in model effectiveness. </details> (b) $P(A|B)$ for cross-type nodes. Figure 4. Conditional probability $P(A|B)$ of user co-likes. <details> <summary>x6.png Details</summary>  ### Visual Description ## Bar Charts: Description Length Distribution for Models and Datasets ### Overview The image contains two side-by-side bar charts comparing the distribution of description lengths for models (blue) and datasets (green). Both charts use a logarithmic y-axis scale (10³ to 10⁵) and share identical x-axis categories: 0, 500, 1000, 1500, and ">2000". ### Components/Axes - **X-axis (Description Length)**: Categorical bins (0, 500, 1000, 1500, >2000) - **Y-axis (Left Chart)**: "# of Models" (log scale: 10³–10⁵) - **Y-axis (Right Chart)**: "# of Datasets" (log scale: 10³–10⁵) - **Legend**: Blue = Models, Green = Datasets (positioned top-center) ### Detailed Analysis #### Models (Blue Chart) - **0**: ~10⁵ models (tallest bar) - **500**: ~10⁴.5 models - **1000**: ~10⁴ models - **1500**: ~10³.5 models - **>2000**: ~10⁴ models (unexpected spike) #### Datasets (Green Chart) - **0**: ~10⁵ datasets (tallest bar) - **500**: ~10⁴.5 datasets - **1000**: ~10⁴ datasets - **1500**: ~10³.5 datasets - **>2000**: ~10³ datasets (smaller spike than models) ### Key Observations 1. **Consistent Decline**: Both charts show a logarithmic decline in counts as description length increases from 0 to 1500. 2. **Anomalous Spike**: The ">2000" category contains disproportionately high counts for models (~10⁴) compared to datasets (~10³), suggesting a potential outlier or categorization error. 3. **Scale Sensitivity**: The logarithmic y-axis emphasizes the dominance of short descriptions (0–1500) while still revealing tail-end distributions. ### Interpretation The data suggests that most models and datasets are described with relatively short text (<1500 characters), with a long-tail distribution. The spike in models at ">2000" could indicate: - A distinct subset of complex models requiring longer descriptions - Data quality issues (e.g., misclassified description lengths) - A fundamental difference in how models vs. datasets are documented The logarithmic scale reveals that while short descriptions dominate, the tail behavior differs significantly between models and datasets. This divergence might reflect differing documentation practices or inherent complexity differences between the two categories. </details> Figure 5. Description length of Model and Dataset. ### 3.2. Statistics and Analysis Distribution of Node and Relation Types. Figure 3 shows the distribution of node and relation types in $\mathsf{HuggingKG}$ . Of the 2,614,270 nodes, Model makes up 46.0%, followed by User (27.9%) and Space (11.8%). Smaller node types such as Task (0.0%) and Paper (0.6%) are important for identifying the characteristics of the resources. Among the 6,246,353 edges, user interactions such as Like (31.5%) and Publish (28.8%) dominate. Edges about model evolution, e.g., Adapter (2.5%), Finetune (1.7%), highlight the technical connections in the community. These patterns reflect a community-driven environment focused on user activity and model interoperability. Resource Contextualization. To analyze patterns of user interest, we compute the conditional probabilities $P(A|B)$ of user co-likes for Model and Dataset across categories, as shown in Figure 4. NLP is the most popular research area, with users from other fields showing a strong interest in NLP resources. RL, in particular, is highly involved in NLP, likely due to advances in reinforcement learning with human feedback (RLHF) with large language models (LLMs). The multimodal community is also interested in NLP, CV, and audio resources. A comparison of Figures 4(a) and 4(b) shows clear differences in interest distribution, both within and between resource types. For example, a strong interest in NLP models is from users who like robotics datasets instead of NLP or RL, reflecting the intersection of embodied intelligence and LLMs. These patterns suggest that $\mathsf{HuggingKG}$ captures valuable information on user interests, useful for tasks like resource recommendation and trend prediction. Textual Attributes. In $\mathsf{HuggingKG}$ , the average length of the description is 270.2 words for Model and 134.1 words for Dataset, much longer than 8.1 words in (Cao et al., 2021). The longest Model description exceeds 2.5M words, and the longest Dataset description exceeds 400K words. As shown in Figure 5, the description length distribution exhibits a long tail, with 57.2% of Model and 33.4% of Dataset lacking descriptions. Peaks at 700–800 words for Model and 1500–1600 words for Dataset are mostly due to template usage. These patterns highlight the challenges of incomplete documentation and information overload, underlining the need for methods that improve metadata quality by combining textual and graph-based data. ## 4. $\mathsf{HuggingBench}$ Benchmark By combining search needs in open source resource communities with the structured information available in $\mathsf{HuggingKG}$ , we identify three IR tasks in this domain: resource recommendation (Section 4.1), task classification (Section 4.2), and model tracing (Section 4.3). We develop their test collections, which result in a novel benchmark, $\mathsf{HuggingBench}$ . ### 4.1. Resource Recommendation Application Scenario. For ML practitioners, selecting an appropriate pre-trained model from thousands of options on platforms like Hugging Face is a significant challenge. For example, an NLP practitioner working on sentiment analysis requires a model tailored to their dataset and task. The resource recommendation task addresses this by recommending models based on user interaction history. It enables practitioners to efficiently identify and deploy the most suitable model, reducing time and effort in resource discovery. Task Definition. The resource recommendation task can be framed as a hybrid problem that integrates general collaborative filtering, social recommendation, and KG-based recommendation. For general collaborative filtering, let $\mathcal{U}=\{u_{1},u_{2},...,u_{M}\}$ represent the set of users and $\mathcal{I}=\{i_{1},i_{2},...,i_{N}\}$ represent the set of items (e.g., Model, Dataset, and Space). The user-item interaction matrix $\mathbf{Y}=\{y_{ui}\mid u\in\mathcal{U},i\in\mathcal{I}\}$ is captured from Like edges, where $y_{ui}=1$ if User $u$ liked item $i$ , and $y_{ui}=0$ otherwise. This matrix serves as the foundation for general recommendation systems. Social recommendation is facilitated by using social relationships between users represented by a graph $\mathcal{S}=\{s_{uv}\mid u,v\in\mathcal{U}\}$ where $s_{uv}=1$ indicates a Follow edge between User nodes $u$ and $v$ . KG-based recommendation draws on structured external knowledge from the $\mathsf{HuggingKG}$ knowledge graph, denoted $\mathcal{G}=(\mathcal{V},\mathcal{E})$ , which encodes external entities (e.g., Paper, Collection) and their interrelations as edges (a.k.a. triples in this context). The objective of the recommendation task is to learn a prediction function $\hat{y}_{ui}=\mathcal{F}(u,i)$ , where $\hat{y}_{ui}$ is the predicted probability that user $u$ interacts with item $i$ . The goal is to rank the items for each user based on these predicted probabilities, prioritizing those with the highest likelihood of interaction to ensure that the most relevant items appear at the top of the recommendation list. Table 2. Test collection for resource recommendation. Avg. means the average number of interactions per user. | | #Users | #Items | #Interactions | Avg. | | --- | --- | --- | --- | --- | | Model | 29,720 | 16,200 | 667,365 | 22.46 | | Dataset | 5,072 | 3,634 | 100,561 | 19.83 | | Space | 14,171 | 5,246 | 297,294 | 20.98 | | Total | 38,624 | 25,080 | 1,065,220 | 27.58 | Table 3. External KGs for KG-based recommendation. | | 2hop | 1hop | Homo | Publish | | --- | --- | --- | --- | --- | | #Nodes | 1,242,578 | 462,213 | 25,080 | 31,754 | | #Edges (Triples) | 3,063,081 | 1,180,911 | 28,346 | 25,078 | | #Relations | 27 | 27 | 7 | 6 | Dataset Construction. Based on $\mathsf{HuggingKG}$ , we extract a bipartite graph representing the Like edges between User nodes and three types of item nodes (Model, Dataset, and Space). Following standard practices in recommendation tasks, we derive a 5-core subgraph (where each node has at least 5 edges to other nodes) from this bipartite graph. Subsequently, we partition the liked-item list for each user into training, validation, and test sets with a split of 60%, 20%, and 20%, respectively. Table 2 shows statistics of the resource recommendation test collection. To support social recommendation, we introduce 84,913 Follow edges between User nodes in the test collection as external Social information. To support KG-based recommendation, we consider three types of subgraphs of $\mathsf{HuggingKG}$ as external KGs: 1hop / 2hop are 1-step/2-step neighborhood subgraphs from item-aligned KG nodes, Homo is the subgraph induced from all item nodes, and Publish is the relation-specific subgraph induced from the Publish edges. Table 3 shows statistics of these external KGs. ### 4.2. Task Classification Application Scenario. Platform curators face the challenge of organizing and tagging models and datasets to improve searchability and usability. For example, a newly uploaded model without clear task annotations becomes difficult for users to discover. The task classification task automates this process by analyzing the metadata and structure information from the platforms to classify the models into relevant tasks (e.g., “text classification” or “named entity recognition”). This ensures proper categorization and improves accessibility for users seeking specific features. Task Definition. The task of classifying Model and Dataset nodes by their associated Task (according to Defined For edges) is framed as a multi-label attributed node classification problem, where each instance can be assigned multiple labels from a set $\mathcal{L}=\{l_{1},l_{2},\dots,l_{K}\}$ . The input consists of a graph $\mathcal{G}=(\mathcal{V},\mathcal{E})$ , where the nodes $\mathcal{V}$ represent Model and Dataset nodes, and the edges $\mathcal{E}$ captured include Finetune edges between Model nodes, Trained Or Finetuned On edges between Model nodes and Dataset nodes, etc. Additionally, a feature matrix $\mathbf{X}\in\mathbb{R}^{|\mathcal{V}|\times d}$ encodes node features such as textual descriptions or metadata. The output for each node $v\in\mathcal{V}$ is a binary vector $\mathbf{y}_{v}\in\{0,1\}^{K}$ , where $y_{v,k}=1$ indicates an association with task $t_{k}$ . The goal is to learn a function $\hat{\mathbf{y}}_{v}=\mathcal{F}(\mathcal{G},\mathbf{X})$ that accurately predicts task labels, using both graph structure and textual information, while optimizing precision and recall across all labels. Table 4. Test collection for task classification. | | #Nodes | #Edges | #Labels | #Train | #Valid | #Test | | --- | --- | --- | --- | --- | --- | --- | | Model | 145,466 | 131,274 | 50 | 103,276 | 19,167 | 27,974 | | Dataset | 6,969 | - | 48 | 6,792 | 1,501 | 708 | | Total | 152,435 | 166,199 | 52 | 110,068 | 20,668 | 28,682 | Dataset Construction. We first select the Model and Dataset nodes in the graph that have associated task labels, based on the Defined For edges between the Model / Dataset nodes and the Task nodes in $\mathsf{HuggingKG}$ . We then add all edges between these nodes and remove any isolated nodes. To better align the task with the scenario of helping the community website automatically predict the task types of newly created models or datasets, we divide the data into training, validation, and test sets based on the creation dates of Model and Dataset. Due to the faster release rate of models compared to datasets, we set a longer time range for Dataset than for Model. Specifically, we select Model nodes created between 2024-08-15 and 2024-10-15, and Dataset nodes created between 2024-04-15 and 2024-08-15 for the validation set. The test set comprises Model nodes created between 2024-10-15 and 2024-12-15, as well as Dataset nodes created between 2024-08-15 and 2024-12-15. The remaining Model and Dataset nodes, released before these periods, are used as the training set. Table 4 shows statistics of the task classification test collection. ### 4.3. Model Tracing Application Scenario. Researchers often need to investigate the lineage and dependencies of model architectures, such as understanding the evolution of GPT-3. The model tracing task facilitates this by tracing the base model of a model, identifying base models (e.g., GPT-2) and related variants, along with their associated datasets and tasks. This capability supports in-depth analysis of model development histories and their connections within the community, aiding reproducibility and innovation. Task Definition. The model tracing task can be formally defined as a specialized link prediction problem within a heterogeneous graph $\mathcal{G}=(\mathcal{V},\mathcal{E})$ , where $\mathcal{V}$ represents the set of nodes, including Model and other nodes (e.g., Dataset, Space), and $\mathcal{E}$ represents the set of edges. Each edge is represented as a triple $(h,r,t)$ , where $h\in\mathcal{V}$ is the head node, $r\in\mathcal{R}$ is the relation (i.e., Adapter, Finetune, Merge or Quantize between Model nodes), and $t\in\mathcal{V}$ is the tail node. Unlike general link prediction tasks, this task specifically predicts the reverse relation between Model nodes: given a relation $r$ and a tail node $t$ , the goal is to predict the corresponding head node $h$ that completes the triple $(h,r,t)$ . The output of the task is a probability distribution $\mathbf{y}\in[0,1]^{|\mathcal{V}|}$ on all candidate head nodes, with $y_{h}$ indicating the probability that node $h$ is the correct match for the triple $(h,r,t)$ . The objective is to learn a function $\hat{\mathbf{y}}_{(r,t)}=\mathcal{F}(\mathcal{G},r,t)$ that maximizes the likelihood of correctly identifying the true head node $h^{*}$ for the triple $(h^{*},r,t)$ . Table 5. Test collection for model tracing. | | #Train | #Valid | #Test | | --- | --- | --- | --- | | Adapter | 565 | 65 | 80 | | Finetune | 15,639 | 1,944 | 1,935 | | Merge | 138 | 24 | 17 | | Quantize | 178 | 16 | 23 | | Total | 16,520 | 2,049 | 2,055 | Dataset Construction. Due to the large size of the complete $\mathsf{HuggingKG}$ , we extract a subgraph to construct the test collection for model tracing. We select the Model nodes associated with the task type “text classification”. Next, we identify the triples where these nodes appear as the head or tail node, incorporating the other node in the triple into the node set $\mathcal{V}$ . We then include all edges between these nodes to form the edge set $\mathcal{E}$ . The resulting subgraph consists of 121,404 nodes, 339,429 edges, and 30 relations. We subsequently partition the inter- Model edges into training, validation, and test sets with a split of 80%, 10%, and 10%, respectively. Table 5 shows statistics of the model tracing test collection. Table 6. Evaluation results of resource recommendation. | Method | KG | Recall@5 | Recall@10 | Recall@20 | Recall@40 | NDCG@5 | NDCG@10 | NDCG@20 | NDCG@40 | | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | | General Collaborative Filtering | | | | | | | | | | | LightGCN | - | 0.0856 | 0.1301 | 0.1932 | 0.2759 | 0.0868 | 0.1003 | 0.1192 | 0.1413 | | HCCF | - | 0.0834 | 0.1254 | 0.1820 | 0.2504 | 0.0847 | 0.0975 | 0.1143 | 0.1328 | | SimGCL | - | 0.0999 | 0.1515 | 0.2186 | 0.3010 | 0.0998 | 0.1158 | 0.1358 | 0.1581 | | LightGCL | - | 0.1033 | 0.1558 | 0.2228 | 0.3017 | 0.1035 | 0.1198 | 0.1398 | 0.1611 | | AutoCF | - | 0.1003 | 0.1530 | 0.2190 | 0.3039 | 0.1012 | 0.1174 | 0.1371 | 0.1598 | | DCCF | - | 0.0985 | 0.1493 | 0.2167 | 0.3003 | 0.0983 | 0.1142 | 0.1343 | 0.1567 | | Social Recommendation | | | | | | | | | | | MHCN | Social | 0.0979 | 0.1490 | 0.2162 | 0.3007 | 0.0998 | 0.1154 | 0.1353 | 0.1579 | | DSL | 0.0932 | 0.1425 | 0.2123 | 0.2986 | 0.0948 | 0.1099 | 0.1307 | 0.1538 | | | KG-Based Recommendation | | | | | | | | | | | KGIN | 1hop | 0.0001 | 0.0004 | 0.0010 | 0.0017 | 0.0002 | 0.0003 | 0.0005 | 0.0007 | | KGCL | 0.0993 | 0.1490 | 0.2135 | 0.2918 | 0.1009 | 0.1160 | 0.1351 | 0.1563 | | | KGRec | 0.0558 | 0.0897 | 0.1395 | 0.2076 | 0.0575 | 0.0681 | 0.0832 | 0.1014 | | | KGIN | 2hop | 0.0002 | 0.0004 | 0.0008 | 0.0016 | 0.0003 | 0.0004 | 0.0005 | 0.0007 | | KGCL | 0.1007 | 0.1510 | 0.2165 | 0.2959 | 0.1016 | 0.1170 | 0.1364 | 0.1579 | | | KGRec | 0.0597 | 0.0941 | 0.1423 | 0.2122 | 0.0625 | 0.0729 | 0.0872 | 0.1057 | | | KGIN | Homo | 0.0061 | 0.0096 | 0.0146 | 0.0219 | 0.0065 | 0.0076 | 0.0091 | 0.0111 | | KGCL | 0.1054 | 0.1578 | 0.2237 | 0.3059 | 0.1058 | 0.1220 | 0.1416 | 0.1637 | | | KGRec | 0.0628 | 0.0985 | 0.1476 | 0.2106 | 0.0638 | 0.0751 | 0.0898 | 0.1067 | | | KGIN | Publish | 0.0002 | 0.0003 | 0.0007 | 0.0016 | 0.0002 | 0.0003 | 0.0004 | 0.0007 | | KGCL | 0.1036 | 0.1543 | 0.2205 | 0.3011 | 0.1038 | 0.1195 | 0.1392 | 0.1609 | | | KGRec | 0.0609 | 0.0941 | 0.1385 | 0.2002 | 0.0636 | 0.0734 | 0.0863 | 0.1027 | | ## 5. Evaluation We evaluate with $\mathsf{HuggingBench}$ . All experiments are conducted on a server with four NVIDIA Tesla V100 SXM2 32 GB GPUs. ### 5.1. Resource Recommendation Evaluation Metrics. Following standard practices in recommender systems (Ren et al., 2024b; He et al., 2020), we use Recall@ $K$ and NDCG@ $K$ as evaluation metrics to evaluate the ranked list of recommended items. The value of $K$ is set to 5, 10, 20, and 40 for the evaluation. Baselines. Following common practice in recommendation (Ren et al., 2024b, a), we select six representative general collaborative filtering methods, including four graph-based methods: LightGCN (He et al., 2020), HCCF (Xia et al., 2022), SimGCL (Yu et al., 2022), and LightGCL (Cai et al., 2023) and two representation learning methods: AutoCF (Xia et al., 2023) and DCCF (Ren et al., 2023). These methods rely on the bipartite user-item graph for interaction modeling. We also adopt two state-of-the-art social recommendation methods: MHCN (Yu et al., 2021) and DSL (Wang et al., 2023). These methods introduce the social graph to capture richer user preferences. In addition, we employ three KG-based recommendation methods: KGIN (Wang et al., 2021), KGCL (Yang et al., 2022), and KGRec (Yang et al., 2023). These methods utilize a unified heterogeneous structure that aligns items in the bipartite graph with nodes from external KGs. We use SSLRec https://github.com/HKUDS/SSLRec (Ren et al., 2024b) to implement the above methods. Implementation Details. For all baseline models, the representation dimension is set to 64. Each model is trained for up to 100 epochs, with a fixed batch size of 4,096 and early stopping based on MRR@5 on the validation set. Validation is performed every 3 epochs, and the patience of early stopping is set to 5. We perform a grid search to select the optimal learning rate from {1e-3, 1e-4, 1e-5} and the number of GNN layers from {2, 3}. Evaluation Results. As shown in Table 6, among the general collaborative filtering methods, LightGCL achieves the best performance, suggesting that interaction graph augmentation through singular value decomposition provides a strong baseline. For social recommendation, MHCN outperforms DSL by +4.80% in Recall@ $5$ , showing the effectiveness of multi-channel hypergraph convolution and self-supervised learning. However, it surpasses only two of the six general collaborative filtering methods, indicating that adding social data does not secure improvement. For KG-based recommendation, KGCL consistently outperforms others in all subgraph types, highlighting the benefits of KG augmentation and contrastive learning. Homo subgraph yields the best results, suggesting that item-related nodes provide high-quality context. In sparse graphs, KGCL is robust due to the use of contrastive learning with well-defined positive and negative pairs, which improves the quality of learned representations. In contrast, KGIN’s performance is highly sensitive to its negative sampling strategy and hyperparameter setting, often instable in sparse or cold-start scenarios. KGRec relies heavily on the quality of entity representations and performs moderately when the graph density is low. Moreover, KG-based methods exhibit higher variance, with Recall@ $5$ having a standard deviation of $0.0431$ , compared to $0.0084$ and $0.0033$ for social and collaborative filtering methods. This suggests that applying KG-based methods requires careful selection and tuning of the specific approach based on data characteristics such as graph density and relation sparsity. Comparison with Other Benchmarks. To investigate the underwhelming performance of social recommendation methods, we compare the social relation statistics of our test collection with those of the LastFM, Douban and Yelp datasets where MHCN has demonstrated strong performance (Yu et al., 2021). LastFM includes $1,892$ users with $25,434$ relations, Douban has $2,848$ users with $35,770$ relations, and Yelp contains $19,535$ users with $864,157$ relations, all of which are considerably denser than our test collection, which consists of $38,624$ users and $84,913$ relations. MHCN relies on dense connections to form meaningful hyperedges, facilitate contrastive learning, and effectively propagate signals. Similarly, despite KGIN’s strong performance on the Amazon-Book, LastFM, and Alibaba datasets (Wang et al., 2021), it performs the worst on our test collection. A possible factor is the KG sparsity: Amazon-Book has $2,557,746$ triples and $88,572$ nodes, LastFM has $464,567$ triples and $58,266$ nodes, and Alibaba has $279,155$ triples and $59,156$ nodes, while our dataset is significantly sparser (Table 3). KGIN relies on dense multi-hop paths ( $\geq 3$ hops) for user-item semantics, which are often missing in sparse KGs. Compared with the aforementioned benchmarks, the metrics of various baselines on our test collection are generally lower, reflecting the difficulty of this recommendation task. In summary, because our test collection provides more domain-specific external relations, which are relatively sparse and specialized compared to relations aligned from huge KGs such as Wikidata, it provides new challenges and benchmarks for recommendation methods that use special additional information for domain adaptation. ### 5.2. Task Classification Evaluation Metrics. Following standard practices in multi-label node classification (Cen et al., 2023), we use Micro-F1. Baselines. We select nine representative GNN-based methods for node classification. GCN (Kipf and Welling, 2017), GAT (Velickovic et al., 2018), and GraphSAGE (Hamilton et al., 2017) establish fundamental architectures with different aggregation schemes. Memory and computation optimization approaches are represented by GraphSAINT (Hamilton et al., 2017), RevGCN (Li et al., 2021), and RevGAT (Li et al., 2021). The remaining methods (APPNP (Klicpera et al., 2019), GRAND (Feng et al., 2020), GCNII (Chen et al., 2020)) focus on addressing specific challenges like label propagation, robustness, and over-smoothing in deep GNNs. We use CogDL (Cen et al., 2023) https://github.com/THUDM/cogdl to implement the above methods. For node feature initialization, we try the following settings: - Binary: Binary one-dimensional vectors for distinguishing between Model (0) and Dataset (1). - Pre-trained Text Embeddings: Embeddings of node description attributes generated using base versions of BERT https://huggingface.co/google-bert/bert-base-uncased and BGE. https://huggingface.co/BAAI/bge-base-en-v1.5 - Finetuned Text Embeddings: Node description attribute embeddings derived from the aforementioned models after finetuning for 1 epoch. We perform a grid search to select the optimal learning rate from {1e-4, 5e-5, 1e-5} and batch size from {8, 16}. The resulting models are denoted as BERT (ft) and BGE (ft). Implementation Details. The hidden size dimension is set to 1,024 for all baselines based on GNN, except GAT and RevGAT, for which it is set to 256 to accommodate GPU memory limitations. Each GNN model is trained for up to 500 epochs, with early stopping based on the Micro-F1 score on the validation set. The patience of validation early stopping is set to 100 epochs. For the training process, the batch size is set at 4,096. We perform a grid search to select the optimal learning rate from {1e-3, 1e-4, 1e-5}, weight decay from {0, 1e-5, 1e-4}, and the number of GNN layers from {2, 3, 4}. Table 7. Evaluation results (Micro-F1) of task classification. | Method | Binary | BERT | BERT (ft) | BGE | BGE (ft) | | --- | --- | --- | --- | --- | --- | | GCN | 0.0662 | 0.7620 | 0.8291 | 0.7411 | 0.8522 | | GAT | 0.0390 | 0.5105 | 0.8125 | 0.5444 | 0.8261 | | GRAND | 0.1228 | 0.1297 | 0.6089 | 0.2646 | 0.4532 | | GraphSAGE | 0.1800 | 0.5341 | 0.8845 | 0.8199 | 0.8830 | | APPNP | 0.0448 | 0.7297 | 0.8304 | 0.7571 | 0.8419 | | GCNII | 0.1149 | 0.6456 | 0.8836 | 0.7779 | 0.8802 | | GraphSAINT | 0.0579 | 0.2703 | 0.8342 | 0.0540 | 0.8251 | | RevGCN | 0.1071 | 0.6763 | 0.8851 | 0.8039 | 0.8770 | | RevGAT | 0.0335 | 0.7412 | 0.8849 | 0.7569 | 0.8716 | Evaluation Results. As shown in Table 7, all models demonstrate limited performance with binary features, with GraphSAGE achieving the best score of only 0.1800. When using pre-trained embeddings, we observe significant improvements across most models, with GCN achieving 0.7620 with BERT embeddings and GraphSAGE reaching 0.8199 with BGE embeddings. For finetuned embeddings, the performance improves substantially, with RevGCN achieving 0.8851 and GraphSAGE reaching 0.8830 with finetuned BERT and BGE respectively, followed closely by GCNII. The experimental results clearly demonstrate that using pre-trained text embeddings as initial features significantly enhances model performance, with an average improvement of 0.5391 in the Micro-F1 score. Furthermore, finetuning the embeddings for task-specific feature learning consistently brings additional gains across all methods and embeddings, with an average improvement of 0.2543 and 0.1871 over BERT and BGE pre-trained embeddings, respectively, suggesting that incorporating domain knowledge through finetuning is important for improving performance in this task. We notice an interesting pattern where simpler architectures like GraphSAGE outperform sophisticated models such as GCNII and RevGAT, particularly with BGE embeddings. This suggests that complex architectural designs might not always be beneficial when working with high-quality pre-trained embeddings, as they may introduce noise or over-smoothing in the feature space. Comparison with Other Benchmarks. We find that sampling-based models such as GRAND and GraphSAINT exhibit unexpectedly poor performance with pre-trained embeddings (0.1297 and 0.2703 with BERT, respectively), despite their effectiveness (Cen et al., 2023) in other multi-label node classification datasets such as ogbn-arxiv (Hu et al., 2020). This performance degradation might be attributed to their sampling strategies potentially disrupting the semantic relations encoded in the pre-trained embeddings. Compared with other commonly used benchmarks, the metrics of our test collection of various baselines are at a medium level (Cen et al., 2023). In summary, for such a new domain-specific classification task, it not only poses new challenges to text embedding models, but also generates new issues worthy of consideration for the GNN-based node classification methods. Table 8. Evaluation results of model tracing. | Method | MRR | Hit@1 | Hit@3 | Hit@5 | Hit@10 | | --- | --- | --- | --- | --- | --- | | Supervised | | | | | | | RESCAL | 0.2694 | 0.2380 | 0.2667 | 0.2929 | 0.3470 | | TransE | 0.5589 | 0.4496 | 0.6321 | 0.6973 | 0.7562 | | DistMult | 0.2050 | 0.1421 | 0.2321 | 0.2735 | 0.3324 | | ComplEx | 0.1807 | 0.1109 | 0.2122 | 0.2599 | 0.3066 | | ConvE | 0.4739 | 0.3766 | 0.5119 | 0.5903 | 0.6735 | | RotatE | 0.5317 | 0.4195 | 0.6029 | 0.6803 | 0.7392 | | HittER | 0.3678 | 0.2900 | 0.4078 | 0.4657 | 0.5314 | | Unsupervised | | | | | | | ULTRA | 0.3373 | 0.1440 | 0.4803 | 0.5309 | 0.6672 | | KG-ICL | 0.4008 | 0.3354 | 0.3792 | 0.4854 | 0.5938 | ### 5.3. Model Tracing Evaluation Metrics. Following standard practices in link prediction (Cui et al., 2024; Sun et al., 2019), we use Mean Reciprocal Rank (MRR) and Hit@ $K$ as evaluation metrics for the model tracing experiments, with $K$ set to 1, 3, 5, and 10. As mentioned in Section 4.3, we only evaluate the results considering the given Model node as the tail node $t$ and the given relation $r$ to predict the head node $h$ . Baselines. According to common practice in the field of link prediction (Broscheit et al., 2020; Galkin et al., 2024; Cui et al., 2024), we select seven supervised methods, including five embedding-based methods: RESCAL (Nickel et al., 2011), TransE (Bordes et al., 2013), DistMult (Yang et al., 2015), ComplEx (Trouillon et al., 2016), and RotatE (Sun et al., 2019) and two deep neural network-based methods: CNN-based ConvE (Dettmers et al., 2018a) and transformer-based HittER (Chen et al., 2021). Among these, TransE is one of the most classic methods, which simply represents nodes as continuous vectors in the embedding space and represents the relations between nodes as translation vectors from the head node to the tail node. We also adopt two recent unsupervised KG foundation models, ULTRA (Galkin et al., 2024) and KG-ICL (Cui et al., 2024). These models represent relations using relation graphs and prompt graphs, respectively, which encode nodes and their scores. Since they do not rely on specific learnable representation vectors for nodes or relations, they can directly utilize frozen pre-trained models on our test collection. We use LibKGE (Broscheit et al., 2020) https://github.com/uma-pi1/kge to implement supervised methods and use the official code https://github.com/DeepGraphLearning/ULTRA https://github.com/nju-websoft/KG-ICL of the two unsupervised models. Implementation Details. For all the baseline methods, the representation dimension is set to 64. Each baseline is trained for up to 100 epochs, with early stopping based on the MRR score on the validation set. Validation is performed every 3 epochs, and the patience of early stopping is set to 5. For training process, the batch size is fixed at 256. We perform a grid search to select the optimal learning rate from {1e-2, 1e-3, 1e-4, 1e-5} and the number of GNN layers from {2, 3}. Evaluation Results. The results for the model tracing task are presented in Table 8. Supervised models, particularly TransE, outperform all other methods, achieving the highest scores in all metrics. In contrast, bilinear models like RESCAL and DistMult, and neural models like ConvE, underperform due to their reliance on multiplicative interactions or convolutions, which fail to capture critical dependencies. In conclusion, simpler geometric transformations are better suited for this task. For unsupervised models, KG-ICL excels in MRR and Hit@1, while ULTRA performs better in Hit@3/5/10 but struggles with accuracy in top-ranked predictions. This difference can be attributed to that ULTRA performs message passing across the entire graph, while KG-ICL initiates message passing from the head node, expanding one hop at each layer, which allows it to focus more on nearby nodes. As a result, KG-ICL achieves a higher Hit@1 score. In conclusion, unsupervised models exhibit a good trade-off between precision and recall for this task. Comparison with Other Benchmarks. In contrast to the results of widely used KG link prediction benchmarks such as FB15k-237 (Toutanova and Chen, 2015) and WN18RR (Dettmers et al., 2018b), TransE performs the best among supervised methods. Although TransE is a classic and effective method, its linear modeling struggles with one-to-many relations (where a single head node and a relation can correspond to multiple tail nodes) (Sun et al., 2019). Consequently, many subsequent models focus on addressing this issue. We analyze the test sets of FB15k-237, WN18RR and our dataset, counting the number of answers corresponding to each (head node, relation) pair. The results show that FB15k-237 has an average of 399.82 answers, WN18RR has 24.57, while our dataset has only 1.04. It indicates that the answers in our test set are nearly unique, making TransE sufficient for our needs. More complex methods tend to focus on distinguishing similar nodes at the many end of one-to-many relations, resulting in suboptimal performance. Compared to the metrics of these baselines on FB15k-237 and WN18RR, the metrics on our test collection are generally lower, suggesting that our test collection is overall more challenging. In summary, the unique distribution of relations in our test collection makes model tracing difficult for existing methods and raises new requirements for approaches designed for this task. ## 6. Conclusion Predicted Impact. $\mathsf{HuggingKG}$ and $\mathsf{HuggingBench}$ will enable impactful IR research activities, particularly in advancing resource recommendation and automatic management within open source communities. These resources not only advance well-established research areas (e.g., recommendation, classification, and KG), but also foster emerging domains related to LLM. For example, by introducing $\mathsf{HuggingKG}$ into the model selection step of methods such as HuggingGPT (Shen et al., 2023), it has the potential to improve the integration of AI tools for LLMs. Given their foundational nature, these resources are designed to remain relevant and useful over an extended period. To ensure long-term sustainability, we plan to release an updated version of $\mathsf{HuggingKG}$ periodically and have provided open source code for KG and benchmark construction, allowing the community to maintain and customize the resources for various use cases. The anticipated research user community spans multiple disciplines, including IR, ML, data mining, and software engineering, with a substantial base of current users. This community is expected to grow significantly in the coming years as the demand for structured knowledge and robust evaluation frameworks increases, driven by advances in the communities of LLM and AI tools. Taken together, these contributions position $\mathsf{HuggingKG}$ and $\mathsf{HuggingBench}$ as enduring assets for the academic and industrial communities. Limitations and Future Work. Our resources have the following limitations to be addressed in future work. First, the data is currently limited to Hugging Face, which restricts the diversity of entities and relations. In future work, we plan to expand $\mathsf{HuggingKG}$ to include additional resource platforms such as GitHub and Kaggle to introduce more types of cross-platform entities and relations. 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