# Copyright The Lightning team. # # Licensed under the Apache License, Version 2.0 (the "License"); # you may not use this file except in compliance with the License. # You may obtain a copy of the License at # # http://www.apache.org/licenses/LICENSE-2.0 # # Unless required by applicable law or agreed to in writing, software # distributed under the License is distributed on an "AS IS" BASIS, # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. # See the License for the specific language governing permissions and # limitations under the License. from collections.abc import Sequence from typing import Any, Optional, Union from torch import Tensor from typing_extensions import Literal from torchmetrics.classification.base import _ClassificationTaskWrapper from torchmetrics.classification.stat_scores import BinaryStatScores, MulticlassStatScores, MultilabelStatScores from torchmetrics.functional.classification.specificity import _specificity_reduce from torchmetrics.metric import Metric from torchmetrics.utilities.enums import ClassificationTask from torchmetrics.utilities.imports import _MATPLOTLIB_AVAILABLE from torchmetrics.utilities.plot import _AX_TYPE, _PLOT_OUT_TYPE if not _MATPLOTLIB_AVAILABLE: __doctest_skip__ = ["BinarySpecificity.plot", "MulticlassSpecificity.plot", "MultilabelSpecificity.plot"] class BinarySpecificity(BinaryStatScores): r"""Compute `Specificity`_ for binary tasks. .. math:: \text{Specificity} = \frac{\text{TN}}{\text{TN} + \text{FP}} Where :math:`\text{TN}` and :math:`\text{FP}` represent the number of true negatives and false positives respectively. The metric is only proper defined when :math:`\text{TN} + \text{FP} \neq 0`. If this case is encountered a score of 0 is returned. As input to ``forward`` and ``update`` the metric accepts the following input: - ``preds`` (:class:`~torch.Tensor`): An int or float tensor of shape ``(N, ...)``. If preds is a floating point tensor with values outside [0,1] range we consider the input to be logits and will auto apply sigmoid per element. Additionally, we convert to int tensor with thresholding using the value in ``threshold``. - ``target`` (:class:`~torch.Tensor`): An int tensor of shape ``(N, ...)`` As output to ``forward`` and ``compute`` the metric returns the following output: - ``bs`` (:class:`~torch.Tensor`): If ``multidim_average`` is set to ``global``, the metric returns a scalar value. If ``multidim_average`` is set to ``samplewise``, the metric returns ``(N,)`` vector consisting of a scalar value per sample. If ``multidim_average`` is set to ``samplewise`` we expect at least one additional dimension ``...`` to be present, which the reduction will then be applied over instead of the sample dimension ``N``. Args: threshold: Threshold for transforming probability to binary {0,1} predictions multidim_average: Defines how additionally dimensions ``...`` should be handled. Should be one of the following: - ``global``: Additional dimensions are flatted along the batch dimension - ``samplewise``: Statistic will be calculated independently for each sample on the ``N`` axis. The statistics in this case are calculated over the additional dimensions. ignore_index: Specifies a target value that is ignored and does not contribute to the metric calculation validate_args: bool indicating if input arguments and tensors should be validated for correctness. Set to ``False`` for faster computations. Example (preds is int tensor): >>> from torch import tensor >>> from torchmetrics.classification import BinarySpecificity >>> target = tensor([0, 1, 0, 1, 0, 1]) >>> preds = tensor([0, 0, 1, 1, 0, 1]) >>> metric = BinarySpecificity() >>> metric(preds, target) tensor(0.6667) Example (preds is float tensor): >>> from torchmetrics.classification import BinarySpecificity >>> target = tensor([0, 1, 0, 1, 0, 1]) >>> preds = tensor([0.11, 0.22, 0.84, 0.73, 0.33, 0.92]) >>> metric = BinarySpecificity() >>> metric(preds, target) tensor(0.6667) Example (multidim tensors): >>> from torchmetrics.classification import BinarySpecificity >>> target = tensor([[[0, 1], [1, 0], [0, 1]], [[1, 1], [0, 0], [1, 0]]]) >>> preds = tensor([[[0.59, 0.91], [0.91, 0.99], [0.63, 0.04]], ... [[0.38, 0.04], [0.86, 0.780], [0.45, 0.37]]]) >>> metric = BinarySpecificity(multidim_average='samplewise') >>> metric(preds, target) tensor([0.0000, 0.3333]) """ plot_lower_bound: float = 0.0 plot_upper_bound: float = 1.0 def compute(self) -> Tensor: """Compute metric.""" tp, fp, tn, fn = self._final_state() return _specificity_reduce(tp, fp, tn, fn, average="binary", multidim_average=self.multidim_average) def plot( self, val: Optional[Union[Tensor, Sequence[Tensor]]] = None, ax: Optional[_AX_TYPE] = None ) -> _PLOT_OUT_TYPE: """Plot a single or multiple values from the metric. Args: val: Either a single result from calling `metric.forward` or `metric.compute` or a list of these results. If no value is provided, will automatically call `metric.compute` and plot that result. ax: An matplotlib axis object. If provided will add plot to that axis Returns: Figure object and Axes object Raises: ModuleNotFoundError: If `matplotlib` is not installed .. plot:: :scale: 75 >>> from torch import rand, randint >>> # Example plotting a single value >>> from torchmetrics.classification import BinarySpecificity >>> metric = BinarySpecificity() >>> metric.update(rand(10), randint(2,(10,))) >>> fig_, ax_ = metric.plot() .. plot:: :scale: 75 >>> from torch import rand, randint >>> # Example plotting multiple values >>> from torchmetrics.classification import BinarySpecificity >>> metric = BinarySpecificity() >>> values = [ ] >>> for _ in range(10): ... values.append(metric(rand(10), randint(2,(10,)))) >>> fig_, ax_ = metric.plot(values) """ return self._plot(val, ax) class MulticlassSpecificity(MulticlassStatScores): r"""Compute `Specificity`_ for multiclass tasks. .. math:: \text{Specificity} = \frac{\text{TN}}{\text{TN} + \text{FP}} Where :math:`\text{TN}` and :math:`\text{FP}` represent the number of true negatives and false positives respectively. The metric is only proper defined when :math:`\text{TN} + \text{FP} \neq 0`. If this case is encountered for any class, the metric for that class will be set to 0 and the overall metric may therefore be affected in turn. As input to ``forward`` and ``update`` the metric accepts the following input: - ``preds`` (:class:`~torch.Tensor`): An int tensor of shape ``(N, ...)`` or float tensor of shape ``(N, C, ..)``. If preds is a floating point we apply ``torch.argmax`` along the ``C`` dimension to automatically convert probabilities/logits into an int tensor. - ``target`` (:class:`~torch.Tensor`): An int tensor of shape ``(N, ...)`` As output to ``forward`` and ``compute`` the metric returns the following output: - ``mcs`` (:class:`~torch.Tensor`): The returned shape depends on the ``average`` and ``multidim_average`` arguments: - If ``multidim_average`` is set to ``global``: - If ``average='micro'/'macro'/'weighted'``, the output will be a scalar tensor - If ``average=None/'none'``, the shape will be ``(C,)`` - If ``multidim_average`` is set to ``samplewise``: - If ``average='micro'/'macro'/'weighted'``, the shape will be ``(N,)`` - If ``average=None/'none'``, the shape will be ``(N, C)`` If ``multidim_average`` is set to ``samplewise`` we expect at least one additional dimension ``...`` to be present, which the reduction will then be applied over instead of the sample dimension ``N``. Args: num_classes: Integer specifying the number of classes average: Defines the reduction that is applied over labels. Should be one of the following: - ``micro``: Sum statistics over all labels - ``macro``: Calculate statistics for each label and average them - ``weighted``: calculates statistics for each label and computes weighted average using their support - ``"none"`` or ``None``: calculates statistic for each label and applies no reduction top_k: Number of highest probability or logit score predictions considered to find the correct label. Only works when ``preds`` contain probabilities/logits. multidim_average: Defines how additionally dimensions ``...`` should be handled. Should be one of the following: - ``global``: Additional dimensions are flatted along the batch dimension - ``samplewise``: Statistic will be calculated independently for each sample on the ``N`` axis. The statistics in this case are calculated over the additional dimensions. ignore_index: Specifies a target value that is ignored and does not contribute to the metric calculation validate_args: bool indicating if input arguments and tensors should be validated for correctness. Set to ``False`` for faster computations. Example (preds is int tensor): >>> from torch import tensor >>> from torchmetrics.classification import MulticlassSpecificity >>> target = tensor([2, 1, 0, 0]) >>> preds = tensor([2, 1, 0, 1]) >>> metric = MulticlassSpecificity(num_classes=3) >>> metric(preds, target) tensor(0.8889) >>> mcs = MulticlassSpecificity(num_classes=3, average=None) >>> mcs(preds, target) tensor([1.0000, 0.6667, 1.0000]) Example (preds is float tensor): >>> from torchmetrics.classification import MulticlassSpecificity >>> target = tensor([2, 1, 0, 0]) >>> preds = tensor([[0.16, 0.26, 0.58], ... [0.22, 0.61, 0.17], ... [0.71, 0.09, 0.20], ... [0.05, 0.82, 0.13]]) >>> metric = MulticlassSpecificity(num_classes=3) >>> metric(preds, target) tensor(0.8889) >>> mcs = MulticlassSpecificity(num_classes=3, average=None) >>> mcs(preds, target) tensor([1.0000, 0.6667, 1.0000]) Example (multidim tensors): >>> from torchmetrics.classification import MulticlassSpecificity >>> target = tensor([[[0, 1], [2, 1], [0, 2]], [[1, 1], [2, 0], [1, 2]]]) >>> preds = tensor([[[0, 2], [2, 0], [0, 1]], [[2, 2], [2, 1], [1, 0]]]) >>> metric = MulticlassSpecificity(num_classes=3, multidim_average='samplewise') >>> metric(preds, target) tensor([0.7500, 0.6556]) >>> mcs = MulticlassSpecificity(num_classes=3, multidim_average='samplewise', average=None) >>> mcs(preds, target) tensor([[0.7500, 0.7500, 0.7500], [0.8000, 0.6667, 0.5000]]) """ plot_lower_bound: float = 0.0 plot_upper_bound: float = 1.0 plot_legend_name: str = "Class" def compute(self) -> Tensor: """Compute metric.""" tp, fp, tn, fn = self._final_state() return _specificity_reduce(tp, fp, tn, fn, average=self.average, multidim_average=self.multidim_average) def plot( self, val: Optional[Union[Tensor, Sequence[Tensor]]] = None, ax: Optional[_AX_TYPE] = None ) -> _PLOT_OUT_TYPE: """Plot a single or multiple values from the metric. Args: val: Either a single result from calling `metric.forward` or `metric.compute` or a list of these results. If no value is provided, will automatically call `metric.compute` and plot that result. ax: An matplotlib axis object. If provided will add plot to that axis Returns: Figure object and Axes object Raises: ModuleNotFoundError: If `matplotlib` is not installed .. plot:: :scale: 75 >>> from torch import randint >>> # Example plotting a single value per class >>> from torchmetrics.classification import MulticlassSpecificity >>> metric = MulticlassSpecificity(num_classes=3, average=None) >>> metric.update(randint(3, (20,)), randint(3, (20,))) >>> fig_, ax_ = metric.plot() .. plot:: :scale: 75 >>> from torch import randint >>> # Example plotting a multiple values per class >>> from torchmetrics.classification import MulticlassSpecificity >>> metric = MulticlassSpecificity(num_classes=3, average=None) >>> values = [] >>> for _ in range(20): ... values.append(metric(randint(3, (20,)), randint(3, (20,)))) >>> fig_, ax_ = metric.plot(values) """ return self._plot(val, ax) class MultilabelSpecificity(MultilabelStatScores): r"""Compute `Specificity`_ for multilabel tasks. .. math:: \text{Specificity} = \frac{\text{TN}}{\text{TN} + \text{FP}} Where :math:`\text{TN}` and :math:`\text{FP}` represent the number of true negatives and false positives respectively. The metric is only proper defined when :math:`\text{TN} + \text{FP} \neq 0`. If this case is encountered for any label, the metric for that label will be set to 0 and the overall metric may therefore be affected in turn. As input to ``forward`` and ``update`` the metric accepts the following input: - ``preds`` (:class:`~torch.Tensor`): An int or float tensor of shape ``(N, C, ...)``. If preds is a floating point tensor with values outside [0,1] range we consider the input to be logits and will auto apply sigmoid per element. Additionally, we convert to int tensor with thresholding using the value in ``threshold``. - ``target`` (:class:`~torch.Tensor`): An int tensor of shape ``(N, C, ...)`` As output to ``forward`` and ``compute`` the metric returns the following output: - ``mls`` (:class:`~torch.Tensor`): The returned shape depends on the ``average`` and ``multidim_average`` arguments: - If ``multidim_average`` is set to ``global`` - If ``average='micro'/'macro'/'weighted'``, the output will be a scalar tensor - If ``average=None/'none'``, the shape will be ``(C,)`` - If ``multidim_average`` is set to ``samplewise`` - If ``average='micro'/'macro'/'weighted'``, the shape will be ``(N,)`` - If ``average=None/'none'``, the shape will be ``(N, C)`` If ``multidim_average`` is set to ``samplewise`` we expect at least one additional dimension ``...`` to be present, which the reduction will then be applied over instead of the sample dimension ``N``. Args: num_labels: Integer specifying the number of labels threshold: Threshold for transforming probability to binary (0,1) predictions average: Defines the reduction that is applied over labels. Should be one of the following: - ``micro``: Sum statistics over all labels - ``macro``: Calculate statistics for each label and average them - ``weighted``: calculates statistics for each label and computes weighted average using their support - ``"none"`` or ``None``: calculates statistic for each label and applies no reduction multidim_average: Defines how additionally dimensions ``...`` should be handled. Should be one of the following: - ``global``: Additional dimensions are flatted along the batch dimension - ``samplewise``: Statistic will be calculated independently for each sample on the ``N`` axis. The statistics in this case are calculated over the additional dimensions. ignore_index: Specifies a target value that is ignored and does not contribute to the metric calculation validate_args: bool indicating if input arguments and tensors should be validated for correctness. Set to ``False`` for faster computations. Example (preds is int tensor): >>> from torch import tensor >>> from torchmetrics.classification import MultilabelSpecificity >>> target = tensor([[0, 1, 0], [1, 0, 1]]) >>> preds = tensor([[0, 0, 1], [1, 0, 1]]) >>> metric = MultilabelSpecificity(num_labels=3) >>> metric(preds, target) tensor(0.6667) >>> mls = MultilabelSpecificity(num_labels=3, average=None) >>> mls(preds, target) tensor([1., 1., 0.]) Example (preds is float tensor): >>> from torchmetrics.classification import MultilabelSpecificity >>> target = tensor([[0, 1, 0], [1, 0, 1]]) >>> preds = tensor([[0.11, 0.22, 0.84], [0.73, 0.33, 0.92]]) >>> metric = MultilabelSpecificity(num_labels=3) >>> metric(preds, target) tensor(0.6667) >>> mls = MultilabelSpecificity(num_labels=3, average=None) >>> mls(preds, target) tensor([1., 1., 0.]) Example (multidim tensors): >>> from torchmetrics.classification import MultilabelSpecificity >>> target = tensor([[[0, 1], [1, 0], [0, 1]], [[1, 1], [0, 0], [1, 0]]]) >>> preds = tensor([[[0.59, 0.91], [0.91, 0.99], [0.63, 0.04]], ... [[0.38, 0.04], [0.86, 0.780], [0.45, 0.37]]]) >>> metric = MultilabelSpecificity(num_labels=3, multidim_average='samplewise') >>> metric(preds, target) tensor([0.0000, 0.3333]) >>> mls = MultilabelSpecificity(num_labels=3, multidim_average='samplewise', average=None) >>> mls(preds, target) tensor([[0., 0., 0.], [0., 0., 1.]]) """ plot_lower_bound: float = 0.0 plot_upper_bound: float = 1.0 plot_legend_name: str = "Label" def compute(self) -> Tensor: """Compute metric.""" tp, fp, tn, fn = self._final_state() return _specificity_reduce( tp, fp, tn, fn, average=self.average, multidim_average=self.multidim_average, multilabel=True ) def plot( self, val: Optional[Union[Tensor, Sequence[Tensor]]] = None, ax: Optional[_AX_TYPE] = None ) -> _PLOT_OUT_TYPE: """Plot a single or multiple values from the metric. Args: val: Either a single result from calling `metric.forward` or `metric.compute` or a list of these results. If no value is provided, will automatically call `metric.compute` and plot that result. ax: An matplotlib axis object. If provided will add plot to that axis Returns: Figure object and Axes object Raises: ModuleNotFoundError: If `matplotlib` is not installed .. plot:: :scale: 75 >>> from torch import rand, randint >>> # Example plotting a single value >>> from torchmetrics.classification import MultilabelSpecificity >>> metric = MultilabelSpecificity(num_labels=3) >>> metric.update(randint(2, (20, 3)), randint(2, (20, 3))) >>> fig_, ax_ = metric.plot() .. plot:: :scale: 75 >>> from torch import rand, randint >>> # Example plotting multiple values >>> from torchmetrics.classification import MultilabelSpecificity >>> metric = MultilabelSpecificity(num_labels=3) >>> values = [ ] >>> for _ in range(10): ... values.append(metric(randint(2, (20, 3)), randint(2, (20, 3)))) >>> fig_, ax_ = metric.plot(values) """ return self._plot(val, ax) class Specificity(_ClassificationTaskWrapper): r"""Compute `Specificity`_. .. math:: \text{Specificity} = \frac{\text{TN}}{\text{TN} + \text{FP}} Where :math:`\text{TN}` and :math:`\text{FP}` represent the number of true negatives and false positives respectively. The metric is only proper defined when :math:`\text{TN} + \text{FP} \neq 0`. If this case is encountered for any class/label, the metric for that class/label will be set to 0 and the overall metric may therefore be affected in turn. This function is a simple wrapper to get the task specific versions of this metric, which is done by setting the ``task`` argument to either ``'binary'``, ``'multiclass'`` or ``multilabel``. See the documentation of :class:`~torchmetrics.classification.BinarySpecificity`, :class:`~torchmetrics.classification.MulticlassSpecificity` and :class:`~torchmetrics.classification.MultilabelSpecificity` for the specific details of each argument influence and examples. Legacy Example: >>> from torch import tensor >>> preds = tensor([2, 0, 2, 1]) >>> target = tensor([1, 1, 2, 0]) >>> specificity = Specificity(task="multiclass", average='macro', num_classes=3) >>> specificity(preds, target) tensor(0.6111) >>> specificity = Specificity(task="multiclass", average='micro', num_classes=3) >>> specificity(preds, target) tensor(0.6250) """ def __new__( # type: ignore[misc] cls: type["Specificity"], task: Literal["binary", "multiclass", "multilabel"], threshold: float = 0.5, num_classes: Optional[int] = None, num_labels: Optional[int] = None, average: Optional[Literal["micro", "macro", "weighted", "none"]] = "micro", multidim_average: Optional[Literal["global", "samplewise"]] = "global", top_k: Optional[int] = 1, ignore_index: Optional[int] = None, validate_args: bool = True, **kwargs: Any, ) -> Metric: """Initialize task metric.""" task = ClassificationTask.from_str(task) assert multidim_average is not None # noqa: S101 # needed for mypy kwargs.update({ "multidim_average": multidim_average, "ignore_index": ignore_index, "validate_args": validate_args, }) if task == ClassificationTask.BINARY: return BinarySpecificity(threshold, **kwargs) if task == ClassificationTask.MULTICLASS: if not isinstance(num_classes, int): raise ValueError(f"`num_classes` is expected to be `int` but `{type(num_classes)} was passed.`") if not isinstance(top_k, int): raise ValueError(f"`top_k` is expected to be `int` but `{type(top_k)} was passed.`") return MulticlassSpecificity(num_classes, top_k, average, **kwargs) if task == ClassificationTask.MULTILABEL: if not isinstance(num_labels, int): raise ValueError(f"`num_labels` is expected to be `int` but `{type(num_labels)} was passed.`") return MultilabelSpecificity(num_labels, threshold, average, **kwargs) raise ValueError(f"Task {task} not supported!")