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Model: navteca/multi-qa-mpnet-base-cos-v1
Source: Original Platform

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README.md

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+---
+language: en
+license: mit
+pipeline_tag: sentence-similarity
+tags:
+- feature-extraction
+- sentence-similarity
+- sentence-transformers
+---
+
+# Multi QA MPNet base model for Semantic Search
+
+This is a [sentence-transformers](https://www.SBERT.net) model: It maps sentences & paragraphs to a 768 dimensional dense vector space and was designed for **semantic search**. It has been trained on 215M (question, answer) pairs from diverse sources.
+
+This model uses [`mpnet-base`](https://huggingface.co/microsoft/mpnet-base).
+
+## Training Data
+We use the concatenation from multiple datasets to fine-tune this model. In total we have about 215M (question, answer) pairs. The model was trained with [MultipleNegativesRankingLoss](https://www.sbert.net/docs/package_reference/losses.html#multiplenegativesrankingloss) using Mean-pooling, cosine-similarity as similarity function, and a scale of 20.
+
+
+| Dataset                    | Number of training tuples  |
+|--------------------------------------------------------|:--------------------------:|
+| [WikiAnswers](https://github.com/afader/oqa#wikianswers-corpus) Duplicate question pairs from WikiAnswers |  77,427,422 |
+| [PAQ](https://github.com/facebookresearch/PAQ) Automatically generated (Question, Paragraph) pairs for each paragraph in Wikipedia | 64,371,441 |
+| [Stack Exchange](https://huggingface.co/datasets/flax-sentence-embeddings/stackexchange_xml) (Title, Body) pairs from all StackExchanges  | 25,316,456 |
+| [Stack Exchange](https://huggingface.co/datasets/flax-sentence-embeddings/stackexchange_xml) (Title, Answer) pairs from all StackExchanges  |  21,396,559 |
+| [MS MARCO](https://microsoft.github.io/msmarco/) Triplets (query, answer, hard_negative) for 500k queries from Bing search engine |  17,579,773 |
+| [GOOAQ: Open Question Answering with Diverse Answer Types](https://github.com/allenai/gooaq) (query, answer) pairs for 3M Google queries and Google featured snippet  | 3,012,496 |
+| [Amazon-QA](http://jmcauley.ucsd.edu/data/amazon/qa/) (Question, Answer) pairs from Amazon product pages | 2,448,839 
+| [Yahoo Answers](https://www.kaggle.com/soumikrakshit/yahoo-answers-dataset) (Title, Answer) pairs from Yahoo Answers | 1,198,260 |
+| [Yahoo Answers](https://www.kaggle.com/soumikrakshit/yahoo-answers-dataset) (Question, Answer) pairs from Yahoo Answers | 681,164 |
+| [Yahoo Answers](https://www.kaggle.com/soumikrakshit/yahoo-answers-dataset) (Title, Question) pairs from Yahoo Answers | 659,896 |
+| [SearchQA](https://huggingface.co/datasets/search_qa) (Question, Answer) pairs for 140k questions, each with Top5 Google snippets on that question | 582,261 |
+| [ELI5](https://huggingface.co/datasets/eli5) (Question, Answer) pairs from Reddit ELI5 (explainlikeimfive) | 325,475 |
+| [Stack Exchange](https://huggingface.co/datasets/flax-sentence-embeddings/stackexchange_xml) Duplicate questions pairs (titles) | 304,525 |
+| [Quora Question Triplets](https://quoradata.quora.com/First-Quora-Dataset-Release-Question-Pairs) (Question, Duplicate_Question, Hard_Negative) triplets for Quora Questions Pairs dataset | 103,663 |
+| [Natural Questions (NQ)](https://ai.google.com/research/NaturalQuestions) (Question, Paragraph) pairs for 100k real Google queries with relevant Wikipedia paragraph | 100,231 |
+| [SQuAD2.0](https://rajpurkar.github.io/SQuAD-explorer/) (Question, Paragraph) pairs from SQuAD2.0 dataset |  87,599 |
+| [TriviaQA](https://huggingface.co/datasets/trivia_qa) (Question, Evidence) pairs | 73,346 |
+| **Total** | **214,988,242** |
+
+## Technical Details
+In the following some technical details how this model must be used:
+
+| Setting | Value |
+| --- | :---: |
+| Dimensions | 768 |
+| Produces normalized embeddings | Yes |
+| Pooling-Method | Mean pooling |
+| Suitable score functions | dot-product, cosine-similarity, or euclidean distance |
+
+Note: This model produces normalized embeddings with length 1. In that case, dot-product and cosine-similarity are equivalent. dot-product is preferred as it is faster. Euclidean distance is proportional to dot-product and can also be used.
+
+## Usage and Performance
+The trained model can be used like this:
+```python
+from sentence_transformers import SentenceTransformer, util
+
+question = "That is a happy person"
+contexts = [
+    "That is a happy dog",
+    "That is a very happy person",
+    "Today is a sunny day"
+]
+
+# Load the model
+model = SentenceTransformer('navteca//multi-qa-mpnet-base-cos-v1')
+
+# Encode question and contexts
+question_emb = model.encode(question)
+contexts_emb = model.encode(contexts)
+
+# Compute dot score between question and all contexts embeddings
+result = util.dot_score(question_emb, contexts_emb)[0].cpu().tolist()
+
+print(result)
+
+#[
+#  0.60806852579116820,
+#  0.94949364662170410,
+#  0.29836517572402954
+#]

config.json

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+{
+  "_name_or_path": "microsoft/mpnet-base",
+  "architectures": [
+    "MPNetForMaskedLM"
+  ],
+  "attention_probs_dropout_prob": 0.1,
+  "bos_token_id": 0,
+  "eos_token_id": 2,
+  "hidden_act": "gelu",
+  "hidden_dropout_prob": 0.1,
+  "hidden_size": 768,
+  "initializer_range": 0.02,
+  "intermediate_size": 3072,
+  "layer_norm_eps": 0.00001,
+  "max_position_embeddings": 514,
+  "model_type": "mpnet",
+  "num_attention_heads": 12,
+  "num_hidden_layers": 12,
+  "pad_token_id": 1,
+  "relative_attention_num_buckets": 32,
+  "transformers_version": "4.8.2",
+  "vocab_size": 30527
+}

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special_tokens_map.json

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+{
+    "bos_token": "<s>",
+    "cls_token": "<s>",
+    "eos_token": "</s>",
+    "mask_token": {
+        "content": "<mask>",
+        "lstrip": true,
+        "normalized": false,
+        "rstrip": false,
+        "single_word": false
+    },
+    "pad_token": "<pad>",
+    "sep_token": "</s>",
+    "unk_token": "[UNK]"
+}

tokenizer_config.json

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+{
+    "bos_token": "<s>",
+    "cls_token": "<s>",
+    "do_lower_case": true,
+    "eos_token": "</s>",
+    "mask_token": "<mask>",
+    "model_max_length": 512,
+    "name_or_path": "microsoft/mpnet-base",
+    "pad_token": "<pad>",
+    "sep_token": "</s>",
+    "special_tokens_map_file": null,
+    "strip_accents": null,
+    "tokenize_chinese_chars": true,
+    "tokenizer_class": "MPNetTokenizer",
+    "unk_token": "[UNK]"
+}