What this category of data looks like
Data sources include compliance documents, industry standards, and local regulatory rules released by official regulatory bodies including the Ministry of Emergency Management, Ministry of Transport, and Ministry of Ecology and Environment. Update frequency aligns with new policy releases, with no fixed cycle. Most documents use a clause-based structure, covering storage and transportation conditions, approval processes, emergency response requirements, and more. Fields include document numbers, issuing authorities, effective dates, units of measurement (such as cubic meters, tons, degrees Celsius), and additional metadata. The length of individual documents varies widely, ranging from hundreds of words of local regulatory rules to tens of thousands of words of national-level standards.
Constraints Imposed on Knowledge Base Retrieval and Recall by These Characteristics
Official policy texts have high rigor, so retrieval results must match the original wording. This requires setting a reasonable range for retrieval thresholds. The clause-based document structure means long texts must be split along clause boundaries to avoid semantic fragmentation that harms recall accuracy. Fields include professional units of measurement and metadata. Retrieval must retain field association information to prevent matching deviations caused by unit ambiguity or missing metadata. Updates align with policy changes, so incremental synchronization must be performed regularly to ensure the knowledge base content matches the latest regulatory requirements.
How to Set Configurations
| Configuration Item | Recommended Setting | Rationale |
|---|---|---|
similarity | 0.75–0.85 | Hazardous chemicals policy content is highly rigorous. A high matching threshold filters irrelevant clauses while retaining enough candidate results to cover Q&A needs |
limit | Top 8 entries | Single policy clause content is precise. A small number of recall results covers core Q&A scope and avoids context overflow |
searchMode | semantic | Policy texts have tight semantic logic. Semantic search better fits the semantic matching requirements of policy Q&A than keyword search |
usingReRank | Enabled | Improves the ranking priority of highly relevant results, preventing non-core clauses with low matching but keyword overlap from appearing first |
datasetSearchUsingExtensionQuery | Enabled | Automatically expands relevant regulatory terms for policy questions, improving recall coverage of policy clauses with different phrasing |
collectionIds | Collection ID corresponding to the hazardous chemicals storage and transportation policy knowledge base | Limits retrieval scope, prevents mixing policy documents from other categories, and ensures Q&A only relates to target domain content |
Three Common Mistakes
- Calling the knowledge base query interface returns empty results with no matching content. Cause: The application and knowledge base belong to different teams, and cross-team knowledge base access permissions are not configured.
- Retrieval results include a large number of irrelevant general chemical clauses that do not match the hazardous chemicals storage and transportation scenario. Cause: The similarity threshold is set too low, recalling non-precisely matched content.
- Key clauses in long policy documents are not recalled, or answers have semantic fragmentation. Cause: Chunking is not performed along clause boundaries, resulting in incomplete content per chunk that cannot be effectively matched.
How to Confirm the Configuration Is Complete
- Enter the application configuration page of FastGPT v4.17.0, and verify that the associated knowledge base collection ID matches the ID of the target hazardous chemicals storage and transportation policy knowledge base.
- Submit a test query related to a single policy, and check whether the similarity score of the returned results falls within the 0.75–0.85 range.
- After enabling the reranking function, verify that the top-ranked result is the policy clause most relevant to the question.
- Check the knowledge base synchronization log to confirm that the latest released policy documents have completed incremental synchronization.
The values provided here are common starting points, and should be evaluated against the reader's own samples.
Question material comes from public community discussions. Configuration values are common starting points and should be measured against your own samples. Verified on 2026-09-28.