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84c34295a1
* Adding ranker similar to retriever and reader * Sort documents according to query-document similarity scores * Reranking and model training runs for small example * Added EvalRanker node * Calculate recall@k in EvalRetriever and EvalRanker nodes * Renaming EvalRetriever to EvalDocuments and EvalReader to EvalAnswers * Added mean reciprocal rank as metric for EvalDocuments * Fix bug that appeared when ranking documents with same score * Remove commented code for unimplmented eval() of Ranker node * Add documentation of k parameter in EvalDocuments * Add Ranker docu and renaming top_k param