Knowledge Base Usage

Garbled File Content

Re-save the file with UTF-8 encoding.

Processing Model vs. Index Model

• File Processing Model: Used for Enhanced Processing and Q&A Splitting during data ingestion. Enhanced Processing generates related questions and summaries; Q&A Splitting generates question-answer pairs.
• Index Model: Used for vectorization — it processes and organizes text data into a structure optimized for fast retrieval.

Excel File Import

Yes. You can upload xlsx and other spreadsheet formats, not just CSV.

Token Calculation

All token counts use the GPT-3.5 tokenizer as the standard.

Restore a Rerank Model

Add the rerank model configuration in your config.json file, then you'll be able to select it again.

Data Retention After Expiration

On the free plan, Knowledge Base data is cleared after 30 days of inactivity (no login). Apps are not affected. Paid plans automatically downgrade to the free plan upon expiration.

Too Many Results Interrupt Answers

FastGPT calculates the maximum response length as:

Max Response = min(Configured Max Response, Max Context Window - History)

For example, with an 18K context model, input + output share the same window. As output grows, available input shrinks.

To fix this:

1. Check your configured max response (response limit) setting.
2. Reduce input to free up space for output — specifically, reduce the number of chat history turns included in the workflow.

Where to find the max response setting:

For self-hosted deployments, you can reserve headroom when configuring model context limits. For example, set a 128K model to 120K — the remaining space will be allocated to output.

Chat History Context Limits

FastGPT calculates the maximum response length as:

Max Response = min(Configured Max Response, Max Context Window - History)

For example, with an 18K context model, input + output share the same window. As output grows, available input shrinks.

To fix this:

1. Check your configured max response (response limit) setting.
2. Reduce input to free up space for output — specifically, reduce the number of chat history turns included in the workflow.

Where to find the max response setting:

For self-hosted deployments, you can reserve headroom when configuring model context limits. For example, set a 128K model to 120K — the remaining space will be allocated to output.