#
Metrics

##
Metrics

###
Metric

###
class lighteval.metrics.Metric

< source >

( metric_name: str higher_is_better: bool category: SamplingMethod sample_level_fn: lighteval.metrics.metrics_sample.SampleLevelComputation | lighteval.metrics.sample_preparator.Preparator corpus_level_fn: typing.Union[lighteval.metrics.metrics_corpus.CorpusLevelComputation, typing.Callable] batched_compute: bool = False )

###
CorpusLevelMetric

###
class lighteval.metrics.utils.metric_utils.CorpusLevelMetric

< source >

( metric_name: str higher_is_better: bool category: SamplingMethod sample_level_fn: lighteval.metrics.metrics_sample.SampleLevelComputation | lighteval.metrics.sample_preparator.Preparator corpus_level_fn: typing.Union[lighteval.metrics.metrics_corpus.CorpusLevelComputation, typing.Callable] batched_compute: bool = False )

Metric computed over the whole corpora, with computations happening at the aggregation phase

###
SampleLevelMetric

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class lighteval.metrics.utils.metric_utils.SampleLevelMetric

< source >

( metric_name: str higher_is_better: bool category: SamplingMethod sample_level_fn: lighteval.metrics.metrics_sample.SampleLevelComputation | lighteval.metrics.sample_preparator.Preparator corpus_level_fn: typing.Union[lighteval.metrics.metrics_corpus.CorpusLevelComputation, typing.Callable] batched_compute: bool = False )

Metric computed per sample, then aggregated over the corpus

###
MetricGrouping

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class lighteval.metrics.utils.metric_utils.MetricGrouping

< source >

( metric_name: list higher_is_better: dict category: SamplingMethod sample_level_fn: lighteval.metrics.metrics_sample.SampleLevelComputation | lighteval.metrics.sample_preparator.Preparator corpus_level_fn: dict batched_compute: bool = False )

Some metrics are more advantageous to compute together at once. For example, if a costly preprocessing is the same for all metrics, it makes more sense to compute it once.

###
CorpusLevelMetricGrouping

###
class lighteval.metrics.utils.metric_utils.CorpusLevelMetricGrouping

< source >

( metric_name: list higher_is_better: dict category: SamplingMethod sample_level_fn: lighteval.metrics.metrics_sample.SampleLevelComputation | lighteval.metrics.sample_preparator.Preparator corpus_level_fn: dict batched_compute: bool = False )

MetricGrouping computed over the whole corpora, with computations happening at the aggregation phase

###
SampleLevelMetricGrouping

###
class lighteval.metrics.utils.metric_utils.SampleLevelMetricGrouping

< source >

( metric_name: list higher_is_better: dict category: SamplingMethod sample_level_fn: lighteval.metrics.metrics_sample.SampleLevelComputation | lighteval.metrics.sample_preparator.Preparator corpus_level_fn: dict batched_compute: bool = False )

MetricGrouping are computed per sample, then aggregated over the corpus

##
Corpus Metrics

###
CorpusLevelF1Score

###
class lighteval.metrics.metrics_corpus.CorpusLevelF1Score

< source >

( average: str num_classes: int = 2 )

####
compute_corpus

< source >

( items: list )

Computes the metric score over all the corpus generated items, by using the scikit learn implementation.

###
CorpusLevelPerplexityMetric

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class lighteval.metrics.metrics_corpus.CorpusLevelPerplexityMetric

< source >

( metric_type: str )

####
compute_corpus

< source >

( items: list )

Computes the metric score over all the corpus generated items.

###
CorpusLevelTranslationMetric

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class lighteval.metrics.metrics_corpus.CorpusLevelTranslationMetric

< source >

( metric_type: str lang: typing.Literal['zh', 'ja', 'ko', ''] = '' )

####
compute_corpus

< source >

( items: list )

Computes the metric score over all the corpus generated items, by using the sacrebleu implementation.

###
MatthewsCorrCoef

###
class lighteval.metrics.metrics_corpus.MatthewsCorrCoef

< source >

( )

####
compute_corpus

< source >

( items: list ) →
float

Parameters

- items (list[dict]) — List of GenerativeCorpusMetricInput

Returns

float

Score

Computes the Matthews Correlation Coefficient, using scikit learn (doc).

##
Sample Metrics

###
ExactMatches

###
class lighteval.metrics.metrics_sample.ExactMatches

< source >

( aggregation_function: typing.Callable[[list[float]], float] = <built-in function max> normalize_gold: typing.Optional[typing.Callable[[str], str]] = None normalize_pred: typing.Optional[typing.Callable[[str], str]] = None strip_strings: bool = False type_exact_match: str = 'full' )

####
compute

< source >

( doc: Doc model_response: ModelResponse **kwargs ) →
float

Parameters

- doc (Doc) — The document containing gold references.
- model_response (ModelResponse) — The model’s response containing predictions.
- **kwargs — Additional keyword arguments.

Returns

float

Aggregated score over the current sample’s items.

Computes the metric over a list of golds and predictions for one single sample.

####
compute_one_item

< source >

( gold: str pred: str ) →
float

Parameters

- gold (str) — One of the possible references
- pred (str) — One of the possible predictions

Returns

float

The exact match score. Will be 1 for a match, 0 otherwise.

Compares two strings only.

###
F1_score

###
class lighteval.metrics.metrics_sample.F1_score

< source >

( aggregation_function: typing.Callable[[list[float]], float] = <built-in function max> normalize_gold: typing.Optional[typing.Callable[[str], str]] = None normalize_pred: typing.Optional[typing.Callable[[str], str]] = None strip_strings: bool = False )

####
compute

< source >

( doc: Doc model_response: ModelResponse **kwargs ) →
float

Parameters

- doc (Doc) — The document containing gold references.
- model_response (ModelResponse) — The model’s response containing predictions.
- **kwargs — Additional keyword arguments.

Returns

float

Aggregated score over the current sample’s items.

Computes the metric over a list of golds and predictions for one single sample.

####
compute_one_item

< source >

( gold: str pred: str ) →
float

Parameters

- gold (str) — One of the possible references
- pred (str) — One of the possible predictions

Returns

float

The f1 score over the bag of words, computed using nltk.

Compares two strings only.

###
LoglikelihoodAcc

###
class lighteval.metrics.metrics_sample.LoglikelihoodAcc

< source >

( logprob_normalization: lighteval.metrics.normalizations.LogProbCharNorm | lighteval.metrics.normalizations.LogProbTokenNorm | lighteval.metrics.normalizations.LogProbPMINorm | None = None )

####
compute

< source >

( doc: Doc model_response: ModelResponse **kwargs ) →
int

Parameters

- doc (Doc) — The document containing choices and gold indices.
- model_response (ModelResponse) — The model’s response containing logprobs.
- **kwargs — Additional keyword arguments.

Returns

int

The eval score: 1 if the best log-prob choice is in gold, 0 otherwise.

Computes the log likelihood accuracy: is the choice with the highest logprob in `choices_logprob` present in the `gold_ixs`?

###
NormalizedMultiChoiceProbability

###
class lighteval.metrics.metrics_sample.NormalizedMultiChoiceProbability

< source >

( log_prob_normalization: lighteval.metrics.normalizations.LogProbCharNorm | lighteval.metrics.normalizations.LogProbTokenNorm | lighteval.metrics.normalizations.LogProbPMINorm | None = None aggregation_function: typing.Callable[[numpy.ndarray], float] = <function max at 0x7f41c9bf4e30> )

####
compute

< source >

( doc: Doc model_response: ModelResponse **kwargs ) →
float

Parameters

- doc (Doc) — The document containing choices and gold indices.
- model_response (ModelResponse) — The model’s response containing logprobs.
- **kwargs — Additional keyword arguments.

Returns

float

The probability of the best log-prob choice being a gold choice.

Computes the log likelihood probability: chance of choosing the best choice.

###
Probability

###
class lighteval.metrics.metrics_sample.Probability

< source >

( normalization: lighteval.metrics.normalizations.LogProbTokenNorm | None = None aggregation_function: typing.Callable[[numpy.ndarray], float] = <function max at 0x7f41c9bf4e30> )

####
compute

< source >

( doc: Doc model_response: ModelResponse **kwargs ) →
float

Parameters

- doc (Doc) — The document containing choices and gold indices.
- model_response (ModelResponse) — The model’s response containing logprobs.
- **kwargs — Additional keyword arguments.

Returns

float

The probability of the best log-prob choice being a gold choice.

Computes the log likelihood probability: chance of choosing the best choice.

###
Recall

###
class lighteval.metrics.metrics_sample.Recall

< source >

( k: int )

####
compute

< source >

( doc: Doc model_response: ModelResponse **kwargs ) →
int

Parameters

- doc (Doc) — The document containing choices and gold indices.
- model_response (ModelResponse) — The model’s response containing logprobs.
- **kwargs — Additional keyword arguments.

Returns

int

Score: 1 if one of the top level predicted choices was correct, 0 otherwise.

Computes the recall at the requested depth level: looks at the `n` best predicted choices (with the highest log probabilities) and see if there is an actual gold among them.

###
MRR

###
class lighteval.metrics.metrics_sample.MRR

< source >

( length_normalization: bool = False )

####
compute

< source >

( model_response: ModelResponse doc: Doc **kwargs ) →
float

Parameters

- model_response (ModelResponse) — The model’s response containing logprobs.
- doc (Doc) — The document containing choices and gold indices.
- **kwargs — Additional keyword arguments.

Returns

float

MRR score.

Mean reciprocal rank. Measures the quality of a ranking of choices (ordered by correctness).

###
ROUGE

###
class lighteval.metrics.metrics_sample.ROUGE

< source >

( methods: str | list[str] multiple_golds: bool = False bootstrap: bool = False normalize_gold: typing.Optional[typing.Callable] = None normalize_pred: typing.Optional[typing.Callable] = None aggregation_function: typing.Optional[typing.Callable] = None tokenizer: object = None )

####
compute

< source >

( doc: Doc model_response: ModelResponse **kwargs ) →
float or dict

Parameters

- doc (Doc) — The document containing gold references.
- model_response (ModelResponse) — The model’s response containing predictions.
- **kwargs — Additional keyword arguments.

Returns

float or dict

Aggregated score over the current sample’s items. If several rouge functions have been selected, returns a dict which maps name and scores.

Computes the metric(s) over a list of golds and predictions for one single sample.

###
BertScore

###
class lighteval.metrics.metrics_sample.BertScore

< source >

( normalize_gold: typing.Optional[typing.Callable] = None normalize_pred: typing.Optional[typing.Callable] = None )

####
compute

< source >

( doc: Doc model_response: ModelResponse **kwargs ) →
dict

Parameters

- doc (Doc) — The document containing gold references.
- model_response (ModelResponse) — The model’s response containing predictions.
- **kwargs — Additional keyword arguments.

Returns

dict

Scores over the current sample’s items.

Computes the prediction, recall and f1 score using the bert scorer.

###
Extractiveness

###
class lighteval.metrics.metrics_sample.Extractiveness

< source >

( normalize_input: <built-in function callable> = <function remove_braces at 0x7f40c5e35b40> normalize_pred: <built-in function callable> = <function remove_braces_and_strip at 0x7f40c5e35bd0> input_column: str = 'text' language: typing.Literal['en', 'de', 'fr', 'it'] = 'en' )

####
compute

< source >

( doc: Doc model_response: ModelResponse **kwargs ) →
dict[str, float]

Parameters

- doc (Doc) — The document containing input text.
- model_response (ModelResponse) — The model’s response containing predictions.
- **kwargs — Additional keyword arguments.

Returns

dict[str, float]

The extractiveness scores.

Compute the extractiveness of the predictions.

This method calculates coverage, density, and compression scores for a single prediction against the input text.

###
Faithfulness

###
class lighteval.metrics.metrics_sample.Faithfulness

< source >

( normalize_input: typing.Callable = <function remove_braces at 0x7f40c5e35b40> normalize_pred: typing.Callable = <function remove_braces_and_strip at 0x7f40c5e35bd0> input_column: str = 'text' )

####
compute

< source >

( doc: Doc model_response: ModelResponse **kwargs ) →
dict[str, float]

Parameters

- doc (Doc) — The document containing input text.
- model_response (ModelResponse) — The model’s response containing predictions.
- **kwargs — Additional keyword arguments.

Returns

dict[str, float]

The faithfulness scores.

Compute the faithfulness of the predictions.

The SummaCZS (Summary Content Zero-Shot) model is used with configurable granularity and model variation.

###
BLEURT

###
class lighteval.metrics.metrics_sample.BLEURT

< source >

( )

####
compute

< source >

( doc: Doc model_response: ModelResponse **kwargs ) →
float

Parameters

- doc (Doc) — The document containing gold references.
- model_response (ModelResponse) — The model’s response containing predictions.
- **kwargs — Additional keyword arguments.

Returns

float

Score over the current sample’s items.

Uses the stored BLEURT scorer to compute the score on the current sample.

###
BLEU

###
class lighteval.metrics.metrics_sample.BLEU

< source >

( n_gram: int )

####
compute

< source >

( doc: Doc model_response: ModelResponse **kwargs ) →
float

Parameters

- doc (Doc) — The document containing gold references.
- model_response (ModelResponse) — The model’s response containing predictions.
- **kwargs — Additional keyword arguments.

Returns

float

Score over the current sample’s items.

Computes the sentence level BLEU between the golds and each prediction, then takes the average.

###
StringDistance

###
class lighteval.metrics.metrics_sample.StringDistance

< source >

( metric_types: list[str] | str strip_prediction: bool = True )

####
compute

< source >

( doc: Doc model_response: ModelResponse **kwargs ) →
dict

Parameters

- doc (Doc) — The document containing gold references.
- model_response (ModelResponse) — The model’s response containing predictions.
- **kwargs — Additional keyword arguments.

Returns

dict

The different scores computed

Computes all the requested metrics on the golds and prediction.

####
edit_similarity

< source >

( s1 s2 ) →
float

Returns

float

Edit similarity score between 0 and 1

Compute the edit similarity between two lists of strings.

Edit similarity is also used in the paper Lee, Katherine, et al. “Deduplicating training data makes language models better.” arXiv preprint arXiv:2107.06499 (2021).

####
longest_common_prefix_length

< source >

( s1: ndarray s2: ndarray )

Compute the length of the longest common prefix.

###
JudgeLLM

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class lighteval.metrics.metrics_sample.JudgeLLM

< source >

( judge_model_name: str template: typing.Callable process_judge_response: typing.Callable judge_backend: typing.Literal['litellm', 'openai', 'transformers', 'vllm', 'tgi', 'inference-providers'] short_judge_name: str | None = None response_format: pydantic.main.BaseModel | None = None url: str | None = None hf_provider: str | None = None max_tokens: int | None = None backend_options: dict | None = None )

###
JudgeLLMMTBench

###
class lighteval.metrics.metrics_sample.JudgeLLMMTBench

< source >

( judge_model_name: str template: typing.Callable process_judge_response: typing.Callable judge_backend: typing.Literal['litellm', 'openai', 'transformers', 'vllm', 'tgi', 'inference-providers'] short_judge_name: str | None = None response_format: pydantic.main.BaseModel | None = None url: str | None = None hf_provider: str | None = None max_tokens: int | None = None backend_options: dict | None = None )

####
compute

< source >

( model_response: list docs: list **kwargs )

Compute the score of a generative task using a llm as a judge. The generative task can be multiturn with 2 turns max, in that case, we return scores for turn 1 and 2. Also returns user_prompt and judgement which are ignored later by the aggregator.

###
JudgeLLMMixEval

###
class lighteval.metrics.metrics_sample.JudgeLLMMixEval

< source >

( judge_model_name: str template: typing.Callable process_judge_response: typing.Callable judge_backend: typing.Literal['litellm', 'openai', 'transformers', 'vllm', 'tgi', 'inference-providers'] short_judge_name: str | None = None response_format: pydantic.main.BaseModel | None = None url: str | None = None hf_provider: str | None = None max_tokens: int | None = None backend_options: dict | None = None )

####
compute

< source >

( model_responses: list docs: list **kwargs )

Compute the score of a generative task using a llm as a judge. The generative task can be multiturn with 2 turns max, in that case, we return scores for turn 1 and 2. Also returns user_prompt and judgement which are ignored later by the aggregator.

###
MajAtK

###
class lighteval.metrics.metrics_sample.MajAtK

< source >

( k: int | None = None **kwargs )

####
compute

< source >

( doc: Doc model_response: ModelResponse **kwargs ) →
float

Parameters

- doc (Doc) — The document containing gold references.
- model_response (ModelResponse) — The model’s response containing predictions.
- **kwargs — Additional keyword arguments.

Returns

float

Aggregated score over the current sample’s items.

Computes the metric over a list of golds and predictions for one single sample. It applies normalisation (if needed) to model prediction and gold, and takes the most frequent answer of all the available ones, then compares it to the gold.

##
LLM-as-a-Judge

###
JudgeLM

###
class lighteval.metrics.utils.llm_as_judge.JudgeLM

< source >

( model: str templates: typing.Callable process_judge_response: typing.Callable judge_backend: typing.Literal['litellm', 'openai', 'transformers', 'tgi', 'vllm', 'inference-providers'] url: str | None = None api_key: str | None = None max_tokens: int = 512 response_format: BaseModel = None hf_provider: typing.Optional[typing.Literal['black-forest-labs', 'cerebras', 'cohere', 'fal-ai', 'fireworks-ai', 'inference-providers', 'hyperbolic', 'nebius', 'novita', 'openai', 'replicate', 'sambanova', 'together']] = None backend_options: dict | None = None )

Parameters

- model (str) — The name of the model.
- templates (Callable) — A function taking into account the question, options, answer, and gold and returning the judge prompt.
- process_judge_response (Callable) — A function for processing the judge’s response.
- judge_backend (Literal[“litellm”, “openai”, “transformers”, “tgi”, “vllm”, “inference-providers”]) — The backend for the judge.
- url (str | None) — The URL for the OpenAI API.
- api_key (str | None) — The API key for the OpenAI API (either OpenAI or HF key).
- max_tokens (int) — The maximum number of tokens to generate. Defaults to 512.
- response_format (BaseModel | None) — The format of the response from the API, used for the OpenAI and TGI backend.
- hf_provider (Literal[“black-forest-labs”, “cerebras”, “cohere”, “fal-ai”, “fireworks-ai”, — “inference-providers”, “hyperbolic”, “nebius”, “novita”, “openai”, “replicate”, “sambanova”, “together”] | None): The HuggingFace provider when using the inference-providers backend.
- backend_options (dict | None) — Options for the backend. Currently only supported for litellm.

A class representing a judge for evaluating answers using either the chosen backend.

Methods: evaluate_answer: Evaluates an answer using the OpenAI API or Transformers library. lazy_load_client: Lazy loads the OpenAI client or Transformers pipeline. call_api: Calls the API to get the judge’s response. call_transformers: Calls the Transformers pipeline to get the judge’s response. call_vllm: Calls the VLLM pipeline to get the judge’s response.

####
dict_of_lists_to_list_of_dicts

< source >

( dict_of_lists )

Parameters

- dict_of_lists — A dictionary where each value is a list. All lists are expected to have the same length.

Transform a dictionary of lists into a list of dictionaries.

Each dictionary in the output list will contain one element from each list in the input dictionary, with the same keys as the input dictionary.

Example:

> > > dict_of_lists_to_list_of_dicts({‘k’: [1, 2, 3], ‘k2’: [‘a’, ‘b’, ‘c’]}) [{‘k’: 1, ‘k2’: ‘a’}, {‘k’: 2, ‘k2’: ‘b’}, {‘k’: 3, ‘k2’: ‘c’}]

####
evaluate_answer

< source >

( question: str answer: str options: list[str] | None = None gold: str | None = None )

Parameters

- question (str) — The prompt asked to the evaluated model.
- answer (str) — Answer given by the evaluated model.
- options (list[str] | None) — Optional list of answer options.
- gold (str | None) — Optional reference answer.

Evaluates an answer using either Transformers or OpenAI API.

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