What the Data for This Category Looks Like
Data sources for residential development intelligent due diligence reports include land use planning filing documents, project approval documents, construction progress ledgers, pre-sale permit public notices, surrounding facility research records, and similar materials. The update rhythm changes with project phases: every two weeks during the project initiation phase, monthly during the construction phase, and archived without changes after completion.
The document structure is divided into five core modules: basic project information, land ownership parameters, planning and design indicators, capital revenue and expenditure ledgers, and compliance approval documents. Fields include land area (unit: square meters), floor area ratio (dimensionless), total investment amount (unit: ten thousand yuan), pre-sale permit number and other unique identifiers.
What Constraints These Characteristics Impose on Knowledge Base Retrieval and Recall
The data sources for residential development due diligence reports are scattered, and their update rhythms are inconsistent. This requires the retrieval system to support multi-data source weight configuration and flexible index refresh trigger mechanisms.
The document structure includes multiple long-text modules and unique identifier fields. It is necessary to avoid breaking field relevance during chunk splitting, while supporting a hybrid retrieval mode that combines exact matching and fuzzy retrieval.
Multi-dimensional field content requires recall results to cover multiple dimensions such as land, planning, and capital, to avoid one-sided recall from a single dimension. In addition, static archived data after completion and dynamic data during the construction phase need differentiated index update strategies, to ensure that the timeliness of retrieval results matches the current project phase.
Configuration Settings
| Configuration Item | Recommended Value Range | Rationale |
|---|---|---|
chunk_size | 800–1200 characters | Residential development due diligence reports contain long text passages such as continuous planning indicators and construction records, to avoid splitting that breaks field relevance |
chunk_overlap | 100–150 characters | Retain contextual cohesion after long chunk splitting, to ensure that clauses of compliance documents are coherent and complete |
recall_top_k | Top 10–15 results | Residential development due diligence data has multi-dimensional field distribution, which needs to cover multiple core information types such as land, planning, and capital |
similarity_threshold | 0.72–0.85 | It is necessary to distinguish land parameters and planning indicators of similar projects to avoid mistakenly recalling irrelevant project data |
enable_rerank | Enabled (open source version can be implemented via local model deployment) | Long texts in residential development due diligence reports require reranking to improve recall accuracy; the open source version can implement enhanced processing by connecting to a local large model |
index_refresh_interval | Triggered according to project nodes | The update rhythm of residential development projects changes with project phases, so a fixed-period refresh strategy is not suitable |
The parameter values provided on this page are conventional recommendations used to set a starting point for configuration. Actual values are affected by material form, data volume and business rules. Specific issues require specific analysis, and it is recommended to test on your own samples before finalizing.
Three Common Misconfigurations
- Symptom: Knowledge base rebuild takes more than 24 hours, and index cannot be actively switched. Cause: The
index_switch_triggerparameter is not configured. The default mode only supports scheduled refresh, does not grant permission to manually trigger index switching, andPARSE_FILE_TIMEOUT_SECONDSis not adjusted to adapt to long document parsing. - Symptom: The conversation interface keeps loading with no retrieval results returned, and the backend shows timeout error code 504. Cause: The value of
recall_top_kis not limited. Recalling too many long texts causes interface timeout, andmax_contextis not configured to limit the total context length. - Symptom: Knowledge base ID and chunk ID cannot be copied, and the copy button is unresponsive. Cause: The "metadata copy permission" is not enabled in the front-end configuration, or the browser security policy blocks clipboard write operations.
How to Verify Proper Configuration
- Manually upload a residential development due diligence report, check the number of parsed chunks and single-chunk length to confirm alignment with the
chunk_sizeconfiguration range. - Enter a known project pre-sale permit number, verify that retrieved results first return the corresponding project’s compliance documents, confirming the exact matching and similarity threshold configurations are active.
- Click the index switch button in the knowledge base list, confirm the index refreshes within a reasonable time, verifying the manual index switch configuration.
- Copy the knowledge base ID and chunk ID, confirm the clipboard retrieves the corresponding text, verifying the front-end metadata copy permission configuration is correct.
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.