What the data for this category looks like
Project approval archives, pipeline survey reports, construction permit documents, completion acceptance ledgers, and similar records provide the primary source for telecommunications engineering construction business process data. Data updates align with project progress timelines. Basic project information becomes available during the project initiation phase. Progress and change records update synchronously during the construction phase. Final records archive and lock after completion acceptance. Individual documents combine structured forms and long-text reports, with fields including project number, construction location, construction period, budget amount, approval nodes, and other relevant fields. Units follow standard engineering conventions, such as meters, square meters, ten thousand yuan, and working days.
Constraints imposed by these characteristics on vector models and indexing
Vector indexes must adapt to both structured fields and long-text passages to support the mixed document structure of telecommunications engineering construction. Chunking processes must avoid breaking the association between approval nodes and corresponding construction requirements. Indexes must prioritize incremental synchronization over full reconstruction to support the incremental update model tied to project progress, reducing long-term resource occupation. Index recall processes must associate unique identifiers such as project number and construction location with multi-field business attributes, avoiding confusion across project content. Vector models must retain unit semantics during encoding to match the standardized engineering units, preventing retrieval deviations caused by separating numerical values and units. This constraint analysis uses the vector indexing logic of FastGPT v4.17.0.
How to configure settings
| Configuration Item | Recommended Value | Rationale |
|---|---|---|
| Chunk Length | 800–1200 characters | Ensures semantic integrity for long-text survey reports and approval documents, avoids breaking construction process descriptions |
| Overlap Length | 100–150 characters | Preserves contextual connections between adjacent chunks, ensures semantic continuity between approval nodes and subsequent requirements |
| Similarity Threshold | 0.72–0.80, calibrated via actual testing | Matches semantic similarity of technical terms in engineering documents, filters low-relevance non-project content |
| Single Search Limit | Top 8 results | Aligns with the core information scope for single-project business processing, avoids retrieving excessive irrelevant historical project data |
maxToken | 3500 token | Matches context length requirements for business guidance scenarios, ensures complete display of approval processes and material requirements |
defaultToken | 150 token | Aligns with short-text encoding requirements for structured fields, retains semantics of key identifiers such as project number and construction location |
Three common misconfigurations
- Phenomenon: The knowledge base shows ongoing training or rebuild status for more than 24 hours, and index switching fails to trigger. Cause: A single project document includes an extremely long completion acceptance report. Total token count after chunking exceeds the system default limit, blocking the index construction process.
- Phenomenon: A 60-second timeout error occurs when switching knowledge base indexes. Cause: Incremental index updates remain unconfigured. Full synchronization includes a large document set with multiple historical projects, pushing single synchronization time beyond the system threshold.
- Phenomenon: Specific project documents repeatedly appear in index recall results, and filtering fails to remove them. Cause: Project number remains unbound as a unique index identifier, causing documents with matching names to index repeatedly and remain indistinguishable.
How to verify correct configuration
- Initiate upload of a single long survey report, confirm chunking results retain complete construction process descriptions with no critical content broken.
- Trigger incremental index updates, verify system logs only show synchronization progress for new projects with no full reconstruction prompts.
- Launch a business guidance query, confirm recall results only include approval nodes and material requirements for the current project with no cross-project irrelevant content.
- Adjust the similarity threshold, launch a test query, confirm recall result relevance changes as expected with the threshold.
The values provided are common starting points, and should be evaluated against corresponding use case 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.