Multi-Hop Evidence Retrieval System

A Multi-Hop Evidence Retrieval System is an evidence retrieval system that is a complex reasoning system implementing iterative retrieval algorithms to solve multi-hop evidence retrieval tasks.

• AKA: Chain Reasoning System, Multi-Step Evidence Extractor.
• Context:
  • It can typically implement Iterative Retrieval Modules for sequential search.
  • It can typically maintain Reasoning State Trackers across retrieval hops.
  • It can typically employ Entity Linkers for cross-document connections.
  • It can typically utilize Evidence Aggregators for chain construction.
  • It can typically provide Reasoning Path Visualizations for interpretability.
  • ...
  • It can often incorporate Graph Neural Networks for reasoning representation.
  • It can often use Reinforcement Learning for retrieval policy.
  • It can often implement Beam Search for multiple reasoning paths.
  • It can often employ Attention Mechanisms for evidence selection.
  • ...
  • It can range from being a Pipeline Multi-Hop System to being an End-to-End Multi-Hop System, depending on its architecture design.
  • It can range from being a Sparse Retrieval System to being a Dense Retrieval System, depending on its retrieval method.
  • ...
  • It can process Document Collections with complex querys.
  • It can output Evidence Chains with confidence scores.
  • It can integrate with Question Answering Systems for answer generation.
  • It can be evaluated by Multi-Hop Retrieval Performance Measures.
  • ...
• Example(s):
  • HotpotQA Baseline Systems using TF-IDF and graph traversal.
  • Dense Passage Retriever adapted for iterative retrieval.
  • REALM System with multi-hop capability for knowledge-intensive tasks.
  • Graph-Based Reasoning Systems over document networks.
  • Neural Multi-Hop Retrievers with learned routing.
  • ...
• Counter-Example(s):
  • Single-Pass Retrieval Systems, which perform one-shot retrieval.
  • Document Ranking Systems, which order documents without chaining.
  • Keyword Search Systems, which lack reasoning capability.
• See: Complex Reasoning System, Evidence Retrieval System, Multi-Document System, Iterative Search System.

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