Jeff Picard

Add OneClassClassifier model

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This PR adds `OneClassClassifier` to flair.models for https://github.com/flairNLP/flair/issues/3496. The task, usage, and architecture are described in the class docstring. The architecture is inspired by papers such as [Anomaly Detection Using...

[Feature]: Anomaly Detection / One Class Classification

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### Problem statement Flair doesn't have an Anomaly Detection / One Class Classification model. While this [question](https://github.com/flairNLP/flair/issues/3411) describes alternate solutions, some use cases could benefit from this dedicated model type....

Draft: Add multi gpu support

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Hi! This is a draft PR that adds multi gpu support. @alanakbik and others: would you be interested in incorporating something like this? The core functionality is working and I've...