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docs: create guide to choose Embedders
We have several Embedders on Haystack 2.0
- API based: OpenAI, Cohere, Jina...
- Sentence Transformers
- HF Text Embedding Inference
- Fastembed
- HF Optimum
Some focus on simplicity, others on supporting a wide range of models, and still others on performance on different architectures.
I think it would benefit users to have a guide, as we did for Generators: this is not something that guides to choosing the best model, but an acceptable Embedder based on one's needs/resources.