Label Ranking Average Precision¶
Module Interface¶
- class torchmetrics.classification.MultilabelRankingAveragePrecision(num_labels, ignore_index=None, validate_args=True, **kwargs)[source]
Computes label ranking average precision score for multilabel data [1]. The score is the average over each ground truth label assigned to each sample of the ratio of true vs. total labels with lower score. Best score is 1.
As input to
forward
andupdate
the metric accepts the following input:preds
(Tensor
): A float tensor of shape(N, C, ...)
. Preds should be a tensor containing probabilities or logits for each observation. If preds has values outside [0,1] range we consider the input to be logits and will auto apply sigmoid per element.target
(Tensor
): An int tensor of shape(N, C, ...)
. Target should be a tensor containing ground truth labels, and therefore only contain {0,1} values (except if ignore_index is specified).
Note
Additional dimension
...
will be flattened into the batch dimension.As output to
forward
andcompute
the metric returns the following output:mlrap
(Tensor
): A tensor containing the multilabel ranking average precision.
- Parameters
Example
>>> from torchmetrics.classification import MultilabelRankingAveragePrecision >>> _ = torch.manual_seed(42) >>> preds = torch.rand(10, 5) >>> target = torch.randint(2, (10, 5)) >>> mlrap = MultilabelRankingAveragePrecision(num_labels=5) >>> mlrap(preds, target) tensor(0.7744)
Initializes internal Module state, shared by both nn.Module and ScriptModule.
Functional Interface¶
- torchmetrics.functional.classification.multilabel_ranking_average_precision(preds, target, num_labels, ignore_index=None, validate_args=True)[source]
Computes label ranking average precision score for multilabel data [1]. The score is the average over each ground truth label assigned to each sample of the ratio of true vs. total labels with lower score. Best score is 1.
Accepts the following input tensors:
preds
(float tensor):(N, C, ...)
. Preds should be a tensor containing probabilities or logits for each observation. If preds has values outside [0,1] range we consider the input to be logits and will auto apply sigmoid per element.target
(int tensor):(N, C, ...)
. Target should be a tensor containing ground truth labels, and therefore only contain {0,1} values (except if ignore_index is specified).
Additional dimension
...
will be flattened into the batch dimension.- Parameters
Example
>>> from torchmetrics.functional.classification import multilabel_ranking_average_precision >>> _ = torch.manual_seed(42) >>> preds = torch.rand(10, 5) >>> target = torch.randint(2, (10, 5)) >>> multilabel_ranking_average_precision(preds, target, num_labels=5) tensor(0.7744)
References
[1] Tsoumakas, G., Katakis, I., & Vlahavas, I. (2010). Mining multi-label data. In Data mining and knowledge discovery handbook (pp. 667-685). Springer US.
- Return type