What the data for this category looks like
Data for thermal coal financing daily reports comes from national coal trading center public ledgers, northern port spot trading records, and futures exchange delivery daily reports. The update frequency is a batch release of single documents between 16:00 and 18:00 daily. The length of single documents varies widely. Conduct statistical analysis or testing with samples before finalizing settings. Document structure includes daily core transaction price ranges, regional price spreads, inventory turnover days, and downstream utilization rate related data. Fields include settled price (yuan/ton), month-on-month change (%), port throughput (10,000 tons), daily power plant consumption (10,000 tons). There are no nested multi-level subfields.
What constraints do these characteristics impose on knowledge base retrieval and recall?
The daily scheduled update requirement means retrieval and recall must limit the time range. Only valid documents from the last 72 hours may be returned to avoid interference from outdated data. Fixed document structure and clear fields require the chunking process to retain the integrity of core fields. Do not split paragraphs across fields. Doing so will prevent retrieval from associating transaction prices with corresponding regions. Daily report documents from multiple data sources have format differences. Preprocessing must unify field names and units. Otherwise, recall results will have unit mismatch errors. The incremental data pressure from daily updates requires configuring an incremental synchronization mechanism. This avoids full retrieval reprocessing of historical data.
How to Set Configurations
| Configuration Item | Recommended Value | Rationale |
|---|---|---|
chunk length | 800–1000 characters | Matches the average length of a single thermal coal financing daily report, avoids splitting core field paragraphs |
recall count | top 6 results | Covers quote data from different regions on the same day, avoids bias from single-region data |
similarity threshold | 0.72–0.78 | Balances precise matching of thermal coal-related keywords and timely data recall |
PARSE_FILE_TIMEOUT_SECONDS | 300 seconds | Adapts to batch parsing duration of multi-source documents |
rerank return count | top 3 results | Focuses on key information such as core transaction prices and regional spreads |
incremental sync toggle | enabled | Adapts to daily updated report data, reduces duplicate retrieval overhead |
The parameter values provided on this page are common starting points for configuration. Actual values are affected by material form, data volume and business rules. Specific issues require case-by-case analysis. It is recommended to test on your own samples before finalizing settings.
Three Common Mistakes
- Phenomenon: The total number of chunks after knowledge base document splitting exceeds 3000, and timeout errors occur during retrieval. Cause: Files were not split according to the length of a single daily report. Uploading multiple daily reports as a single file causes the single-file chunk count to exceed the limit.
- Phenomenon: The rerank model passes deployment testing, but the rerank flag in retrieval results is false. Cause: The rerank call toggle was not enabled in the knowledge base configuration, or the input format of the rerank model does not match the field structure of the thermal coal daily reports.
- Phenomenon: Retrieval results include non-current historical data and cannot filter outdated information. Cause: The time range filter parameter was not configured, or the time threshold was set too long, exceeding the 72-hour valid update cycle.
How to Confirm Configuration is Correct
- Upload a single thermal coal financing daily report document. Check the number of parsed chunks to confirm the single-file chunk count meets the preset chunking configuration requirements.
- Initiate a retrieval containing "today's thermal coal settled price". Check the timestamp of returned results to confirm only valid documents from the last 72 hours are included.
- Trigger a rerank test. Check if the rerank flag of retrieval results is true to confirm the rerank model is called normally and takes effect.
- Check the knowledge base field mapping configuration. Confirm core fields such as settled price and region are correctly associated, with no unit matching 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.