This error is caused by nano-graphrag tries to compute communities on an empty network. In most cases, this is caused by the LLM model you're using, it fails to extract any entities or relations, so the graph is empty.
Try to use another bigger LLM, or here are some ideas to fix it:
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Check the response from the LLM, make sure the result fits the desired response format of the extracting entities prompt.
The desired response format is something like that:
("entity"<|>"Cruz"<|>"person"<|>"Cruz is associated with a vision of control and order, influencing the dynamics among other characters.") -
Some LLMs may not return the format like above, so one possible solution is to add a system instruction to the input prompt, such like:
{ "role": "system", "content": "You are an intelligent assistant and will follow the instructions given to you to fulfill the goal. The answer should be in the format as in the given example." }You can use this system_prompt as default for your LLM calling funcation
One possible reason of 'Processed 42 chunks,0 entities(duplicated),0 relations(duplicated)WARNING:nano-graphrag:Didn't extract any entities, maybe your LLM is not working WARNING:nano-graphrag:No new entities found'
The default num_ctx of ollama is 2048 which is too small for the input prompt of entity extraction. This causes the model to fail to respond correctly.
Solution: Each model in Ollama has a configuration file. Here, you need to generate a new configuration file based on the original one, and then use this configuration file to generate a new model. For example the qwen2, run the following command:
ollama show --modelfile qwen2 > Modelfile
Add a new line into this file below the 'FROM':
PARAMETER num_ctx 32000
ollama create -f Modelfile qwen2:ctx32k
Afterwards, you can use qwen2:ctx32k to replace qwen2.