Added cls pooling for onnx conversion #535
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Some models use not the mean pooling but other types of pooling. One of them is CLS-Pooling from Sentence Transformers.
For example, the current state-of-the-art model on the MTEB Leaderboard uses it (BAAI/bge-large-en).
https://huggingface.co/BAAI/bge-large-en/blob/main/1_Pooling/config.json
The code is mostly copy-pasted from the Sentence Transformers library.