Knowledge Graphs

Table of Contents Introduction Background 2.1. Knowledge Graphs 2.2. Graph Embeddings 2.3. Inference over Knowledge Graphs Why Low‑Latency Matters Distributed Graph Processing Engines 4.1. Classic Pregel‑style Systems 4.2. Data‑Parallel Graph Engines 4.3. GPU‑Accelerated Frameworks Scaling Strategies for Low‑Latency Embedding 5.1. Graph Partitioning & Replication 5.2. Asynchronous vs. Synchronous Training 5.3. Parameter Server & Sharding 5.4. Caching & Sketches 5.5. Hardware Acceleration Low‑Latency Embedding Techniques 6.1. Online / Incremental Learning 6.2. Negative Sampling Optimizations 6.3. Mini‑Batch & Neighborhood Sampling 6.4. Quantization & Mixed‑Precision Designing a Low‑Latency Inference Engine 7.1. Query Planning & Subgraph Extraction 7.2. Approximate Nearest Neighbor (ANN) Search 7.3. Result Caching & Warm‑Start Strategies Practical End‑to‑End Example 8.1. Setup: DGL + Ray + Faiss 8.2. Distributed Training Script 8.3. Low‑Latency Inference Service Real‑World Applications Best Practices & Future Directions Conclusion Resources Introduction Knowledge graphs (KGs) have become a cornerstone for modern AI systems—from search engines that understand entities and relationships to recommendation engines that reason over user‑item interactions. To unlock the full potential of a KG, two computationally intensive steps are required: ...

Introduction Retrieval‑Augmented Generation (RAG) has become the de‑facto pattern for building LLM‑powered applications that require up‑to‑date, factual grounding. The classic RAG loop—retrieve → augment → generate—works well when the underlying corpus is static, modest in size, and centrally stored. In real‑world enterprises, however, knowledge is: Distributed across departments, clouds, and edge devices. Highly dynamic, with frequent schema changes, regulatory updates, and domain‑specific nuances. Sensitive, requiring strict data‑privacy and compliance guarantees. To meet these constraints, a new generation of agentic RAG systems is emerging. These systems treat each retrieval or reasoning component as an autonomous “agent” capable of issuing tool calls, negotiating with peers, and learning from interaction. When combined with federated knowledge graphs (FKGs)—graph databases that are physically partitioned but logically unified—agentic RAG can scale to billions of entities while respecting data sovereignty. ...

Demystifying Semiring Provenance: Making AI Knowledge Tracking Accessible for Everyone Imagine you’re a detective piecing together a complex case. You have clues (facts), rules for connecting them, and you need to trace exactly how you arrived at “the butler did it.” What if that detective work could be automated in AI systems handling massive knowledge bases—like medical diagnoses, legal reasoning, or recommendation engines? That’s the essence of the research paper “Semiring Provenance for Lightweight Description Logics” by Camille Bourgaux, Ana Ozaki, and Rafael Peñaloza.[1][2] ...

Table of Contents Introduction Why Traditional Vector Search Falls Short for Long Contexts Enter GraphRAG: A Hybrid Retrieval Paradigm Fundamentals of Knowledge Graphs for Retrieval Architectural Blueprint of a GraphRAG System Building the Knowledge Graph: Practical Steps Indexing and Embedding Strategies Query Processing Workflow Hands‑On Example: Implementing GraphRAG with Neo4j & LangChain Performance Considerations & Scaling Evaluation Metrics for Long‑Context Retrieval Best Practices & Common Pitfalls Future Directions Conclusion Resources Introduction The explosion of large language models (LLMs) has made retrieval‑augmented generation (RAG) the de‑facto standard for building intelligent assistants, chatbots, and domain‑specific QA systems. Most RAG pipelines rely on vector search: documents are embedded into a high‑dimensional space, an approximate nearest‑neighbor (ANN) index is built, and the model retrieves the top‑k most similar chunks at inference time. ...

Introduction The convergence of three once‑separate research strands—knowledge graphs, decentralized architectures, and retrieval‑augmented generation (RAG)—has opened a new frontier for building autonomous multi‑agent systems that can reason, retrieve, and synthesize information at scale. In a traditional RAG pipeline, a single language model queries a static corpus, retrieves relevant passages, and augments its generation with that context. While effective for many use‑cases, this monolithic approach struggles with: Data silos: Knowledge resides in isolated databases, proprietary APIs, or edge devices. Scalability limits: Centralised storage becomes a bottleneck as the graph grows. Trust and provenance: Users need verifiable sources for generated content, especially in regulated domains. A decentralized knowledge graph (DKG) solves the first two problems by distributing graph data across a peer‑to‑peer (P2P) network, often leveraging technologies such as IPFS, libp2p, or blockchain‑based ledgers. When combined with autonomous agents—software entities capable of planning, executing, and negotiating tasks—the system can orchestrate retrieval, reasoning, and generation across many nodes, each contributing its own expertise and data. ...