a  d @sPddlmZddlZddlmZmZddlmZddlmZGdddeZ dS))AnyN)Tensortensor)_vif_per_channel)MetriccsjeZdZUdZdZdZdZeed<eed<de e ddfd d Z eedd d d Z edddZ ZS)VisualInformationFidelityuCompute Pixel Based Visual Information Fidelity (VIF_). As input to ``forward`` and ``update`` the metric accepts the following input - ``preds`` (:class:`~torch.Tensor`): Predictions from model of shape ``(N,C,H,W)`` with H,W ≥ 41 - ``target`` (:class:`~torch.Tensor`): Ground truth values of shape ``(N,C,H,W)`` with H,W ≥ 41 As output of `forward` and `compute` the metric returns the following output - ``vif-p`` (:class:`~torch.Tensor`): Tensor with vif-p score Args: sigma_n_sq: variance of the visual noise kwargs: Additional keyword arguments, see :ref:`Metric kwargs` for more info. Example: >>> import torch >>> _ = torch.manual_seed(42) >>> from torchmetrics.image import VisualInformationFidelity >>> preds = torch.randn([32, 3, 41, 41]) >>> target = torch.randn([32, 3, 41, 41]) >>> vif = VisualInformationFidelity() >>> vif(preds, target) tensor(0.0032) TF vif_scoretotal@N) sigma_n_sqkwargsreturnc s|tjfi|t|ts4t|ts4td||dkrJtd||jdtddd|jdtddd||_dS)NzIArgument `sigma_n_sq` is expected to be a positive float or int, but got rrgsum)defaultZdist_reduce_fxr ) super__init__ isinstancefloatint ValueErrorZ add_staterr )selfr r  __class___/var/www/html/stable-diffusion-webui/venv/lib/python3.9/site-packages/torchmetrics/image/vif.pyr:sz"VisualInformationFidelity.__init__)predstargetr cstd}fddt|D}|dkr>tt|dnt|}jt|7_jj d7_dS)z*Update state with predictions and targets.c sJg|]B}tdd|ddddfdd|ddddfjqS)N)rr ).0irrrrr Jsz4VisualInformationFidelity.update..rN) sizerangetorchmeanstackcatrrr shape)rrrZchannelsZvif_per_channelrr rupdateGs $z VisualInformationFidelity.update)r cCs |j|jS)zCompute vif-p over state.)rr )rrrrcomputeQsz!VisualInformationFidelity.compute)r )__name__ __module__ __qualname____doc__Zis_differentiableZhigher_is_betterZfull_state_updater__annotations__rrrr)r* __classcell__rrrrrs   r) typingrr$rrZ!torchmetrics.functional.image.vifrZtorchmetrics.metricrrrrrrs