Programmatic and model-based evaluations
Tasks in CURIE are varied and have ground-truth annotations in mixed and heterogeneous form, e.g., as JSONs, latex equations, YAML files, or free-form text. Evaluating free-form generation is challenging because answers are often descriptive, and even when a format is specified, as in most of our cases, the response to each field can have differing forms. For example, materials grid points may sometimes be specified as “[p, q, r]” and at other times as “p × q × r”. Hence, in addition to the programmatic evaluation metrics, such as ROUGE-L, intersection-over-inion (used for BIOGR), and identity ratio (used in PDB), we propose two model-based evaluation metrics.
(1) LMScore: Prompts an LLM asking how closely the predictions match ground truth on a 3-point scale: “good” if the prediction has few minor errors, “okay” if there are many minor errors, and “bad” if there are major errors. We consider the weighted average of the log-likelihood scores of the tokens to produce a final confidence.
(2) LLMSim: Is used for retrieval tasks where we ask the model to exhaustively extract many details, e.g., descriptors, properties and values of materials from a research document, and provide as output an unordered list of dictionaries or records. We use a chain-of-thought (CoT) prompt that asks the LLM to look at each ground-truth record and identify the predicted records that correctly match each field (key) and value of the ground truth. Once we match the ground-truth records with predicted records, we can then measure precision and recall for the retrieval task, and compute the mean average precision, recall and F1 scores across all documents.