What the data for this category looks like
The data for air pollution control financing daily reports primarily comes from project announcements by local ecological environment departments, financing filing announcements from the National Development and Reform Commission, and public survey data from professional environmental industry consulting institutions. Updates are released each workday, covering air pollution control-related financing projects from the current day and the past three workdays. Each document follows a fixed structure, with seven core fields: project name, affiliated region, control type (such as VOCs control, dust prevention), financing amount, financing subject, investor, and filing date. The unit for financing amount is ten thousand yuan. Date fields use the YYYY-MM-DD format. Some documents include project approval document numbers.
What constraints do these characteristics impose on knowledge base retrieval and recall
The data sources for this category are scattered and have diverse formats, including PDF announcement files, Excel filing forms, web press releases, and other formats. This requires the knowledge base to support multi-type file parsing logic during upload. Chunking strategies must balance structured fields and unstructured project description content. The combination of fixed fields and multiple control types requires retrieval to match both core field semantics and governance scenario features, to avoid overly general recall of irrelevant projects. The daily update rhythm requires the knowledge base incremental synchronization mechanism to support date-based incremental pulling, and avoid repeated inclusion of multiple versions of financing information for the same project. The numeric financing amount field must support structured extraction and range retrieval, to improve retrieval accuracy.
How to Set Configurations
| Configuration Item | Recommended Value | Rationale |
|---|---|---|
chunkSize | 800–1200 characters | Air pollution control financing daily reports include long-text project background descriptions and structured fields. This range balances context completeness and retrieval accuracy |
topK | Top 8–12 entries | The number of financing projects per workday is moderate. This value range covers valid projects from the current day and the past two days, and avoids redundant recall |
similarityThreshold | 0.72–0.78 | There are many semantically similar expressions for control types and financing subjects. This range filters low-relevance results while retaining synonym matching results |
incrementalUpdateInterval | Every 4 hours | Matches the workday update rhythm, avoids excessive delay or repeated pulling |
structuredExtractFields | Project name, affiliated region, control type, financing amount, filing date | Corresponds to the fixed fields of the daily report. Enabling structured extraction supports precise field retrieval |
The parameter values provided on this page are common starting points for configuration. Actual values are affected by material formats, data volume, and business rules. Specific issues require targeted analysis. It is recommended to test on your own samples before finalizing settings.
Three Common Mistakes
- Phenomenon: After uploading air pollution control financing daily report files, no matching results are returned when searching for a specific project name. Cause: Structured field extraction function is not enabled, or the chunk length is set too long, causing the project name to be truncated and unable to be matched by semantic retrieval.
- Phenomenon: Semantic retrieval returns a large number of duplicate financing information for the same project. Cause: The
maxContextWindowparameter is not set, or the reference upper limit value is too large, causing multiple document fragments of the same project to be recalled repeatedly. - Phenomenon: An error
invalid configuration parameter name "hnsw.max_scan_tuple"is returned during knowledge base search. Cause: Underlying configuration parameters of the vector retrieval engine were manually modified, and official parameter configurations provided by the platform were not used, resulting in parameter names not supported by the current version.
How to Confirm Proper Configuration
- Upload one typical air pollution control financing daily report document, check the parsed chunked content, confirm that core fields are correctly extracted and chunked.
- Initiate a retrieval for a specific control type, verify the matching degree of the returned results' control types, and adjust the similarity threshold to meet business requirements.
- Manually trigger an incremental synchronization, check the synchronization log to confirm that the latest financing projects of the current day have been successfully included, with no duplicate entries.
- View the vector database configuration page, confirm that no manually modified underlying parameters not officially allowed are present, to avoid configuration errors.
Question material comes from public community discussions. Configuration values are common starting points and should be measured against your own samples. Verified on 2026-09-14.