hallucination-index
Initiative to evaluate and rank the most popular LLMs across common task types based on their propensity to hallucinate.
Stars: 54
LLM Hallucination Index - RAG Special is a comprehensive evaluation of large language models (LLMs) focusing on context length and open vs. closed-source attributes. The index explores the impact of context length on model performance and tests the assumption that closed-source LLMs outperform open-source ones. It also investigates the effectiveness of prompting techniques like Chain-of-Note across different context lengths. The evaluation includes 22 models from various brands, analyzing major trends and declaring overall winners based on short, medium, and long context insights. Methodologies involve rigorous testing with different context lengths and prompting techniques to assess models' abilities in handling extensive texts and detecting hallucinations.
README:
https://www.rungalileo.io/hallucinationindex
There were two key LLM attributes we wanted to test as part of this Index - context length and open vs. closed-source.
With the rising popularity of RAG, we wanted to see how context length affects model performance. Providing an LLM with context data is akin to giving a student a cheat sheet for an open-book exam. We tested three scenarios:
| Context Length | Task Description |
|---|---|
| Short Context | Provide the LLM with < 5k tokens of context data, equivalent to a few pages of information. |
| Medium Context | Provide the LLM with 5k - 25k tokens of context data, equivalent to a book chapter. |
| Long Context | Provide the LLM with 40k - 100k tokens of context data, equivalent to an entire book. |
The open-source vs. closed-source software debate has waged on since the Free Software Movement (FSM) in the late 1980s. This debate has reached a fever pitch during the LLM Arms Race. The assumption is closed-source LLMs, with their access to proprietary training data, will perform better, but we wanted to put this assumption to the test.
We experimented with a prompting technique known as Chain-of-Note, which has shown promise for enhancing performance in short-context scenarios, to see if it similarly benefits medium and long contexts.
We tested 22 models, 10 closed-source models and 12 open-source models, from leading foundation model brands like OpenAI, Anthropic, Meta, Google, Mistral, and more.
We evaluated SCR using a rigorous set of datasets to test the model's robustness in handling short contexts. One of our key methodologies was Chainpoll with GPT-4o. This involves polling the model multiple times using a chain of thought technique, allowing us to:
- Quantify potential hallucinations.
- Offer context-based explanations, a crucial feature for RAG systems.
Our focus here was on assessing modelsβ ability to comprehensively understand extensive texts in medium and long contexts. The procedure involved:
- Extracting text from 10,000 recent documents of a company.
- Dividing the text into chunks and designating one as the "needle chunk."
- Constructing retrieval questions answerable using the needle chunk embedded in the context.
- Medium: 5k, 10k, 15k, 20k, 25k tokens
- Long: 40k, 60k, 80k, 100k tokens
- All text in context must be from a single domain.
- Responses should be correct even with short context, confirming the influence of longer contexts.
- Questions should not be answerable from pre-training memory or general knowledge.
- Measure the influence of information position by keeping everything constant except the location of the needle.
- Avoid standard datasets to prevent test leakage.
We experimented with a prompting technique known as Chain-of-Note, which has shown promise for enhancing performance in short-context scenarios, to see if it similarly benefits medium and long contexts.
Adherence to context was evaluated using a custom LLM-based assessment, checking for the relevant answer within the response.
To evaluate a modelβs propensity to hallucinate, we employed a high-performance evaluation technique to assess contextual adherence and factual accuracy. Learn more about Galileoβs Context Adherence and ChainPoll.
For an in-depth understanding, we recommend checking out https://www.rungalileo.io/hallucinationindex.
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