Add classification metrics: SensitivityAtSpecificity and SpecificityAtSensitivity

[iamharsha1999]

Discussed in #965

^{Originally posted by iamharsha1999 April 19, 2022}
I was specifically looking for the following two metrics:

1. Sensitivity at Specificity
2. Specificity at Sensitivity

However I was not able to find it ? Would it be possible to add these implementations to torchmetrics.

You can find the tensorflow implementations below:
https://www.tensorflow.org/api_docs/python/tf/keras/metrics/SpecificityAtSensitivity
https://www.tensorflow.org/api_docs/python/tf/keras/metrics/SensitivityAtSpecificity

[github-actions]

Hi! thanks for your contribution!, great first issue!

[SkafteNicki]

Hi @iamharsha1999,
You are completely right that these metrics are not implemented in torchmetrics, yet ;)
Would you like to contribute them to the project?

[iamharsha1999]

@SkafteNicki Hey Sure! I'd like to try it out.

[angadkalra]

Any progress on this? I actually implemented this metric for my own project and can contribute if needed.

[iamharsha1999]

Any progress on this? I actually implemented this metric for my own project and can contribute if needed.

Hey kindly,
Go ahead and contribute. I can jump in later. Have been busy with work lately.

[stancld]

Hi @angadkalra, do you have any updates here? :]

[angadkalra]

Sorry for the late reply! I will contribute ASAP.

[iamharsha1999]

@angadkalra @SkafteNicki Hey any update on this issue. I can try this out and contribute.

[angadkalra]

@iamharsha1999 go ahead, I'm busy with work as well.

[shenoynikhil]

I had a draft local branch on this a while back. Just put it up since there had been no update on this. Feel free to implement the other variant SensitivityAtSpecificity if you guys are interested.