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# nomic-embed-text-v1-unsupervised: A Reproducible Long Context (8192) Text Embedder
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`nomic-embed-text-v1-unsupervised` is 8192 context length text encoder. This is a checkpoint after contrastive pretraining from multi-stage contrastive training of the
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[final model](https://huggingface.co/nomic-ai/nomic-embed-text-v1).
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.
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| Name | SeqLen | MTEB | LoCo | Jina Long Context | Open Weights | Open Training Code | Open Data |
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| :-------------------------------:| :----- | :-------- | :------: | :---------------: | :-----------: | :----------------: | :---------- |
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| nomic-embed-text-v1 | 8192 | **62.39** |**85.53** | 54.16 | ✅ | ✅ | ✅ |
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| jina-embeddings-v2-base-en | 8192 | 60.39 | 85.45 | 51.90 | ✅ | ❌ | ❌ |
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| text-embedding-3-small | 8191 | 62.26 | 82.40 | **58.20** | ❌ | ❌ | ❌ |
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| text-embedding-ada-002 | 8191 | 60.99 | 52.7 | 55.25 | ❌ | ❌ | ❌ |
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If you would like to finetune a model on more data, you can use this model as an initialization
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## Hosted Inference API
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The easiest way to get started with Nomic Embed is through the Nomic Embedding API.
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Generating embeddings with the `nomic` Python client is as easy as
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```python
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from nomic import embed
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output = embed.text(
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texts=['Nomic Embedding API', '#keepAIOpen'],
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model='nomic-embed-text-v1',
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task_type='search_document'
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)
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print(output)
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```
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For more information, see the [API reference](https://docs.nomic.ai/reference/endpoints/nomic-embed-text)
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## Data Visualization
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Click the Nomic Atlas map below to visualize a 5M sample of our contrastive pretraining data!
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[![image/webp](https://cdn-uploads.huggingface.co/production/uploads/607997c83a565c15675055b3/pjhJhuNyRfPagRd_c_iUz.webp)](https://atlas.nomic.ai/map/nomic-text-embed-v1-5m-sample)
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## Training Details
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We train our embedder using a multi-stage training pipeline. Starting from a long-context [BERT model](https://huggingface.co/nomic-ai/nomic-bert-2048),
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the first unsupervised contrastive stage trains on a dataset generated from weakly related text pairs, such as question-answer pairs from forums like StackExchange and Quora, title-body pairs from Amazon reviews, and summarizations from news articles.
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In the second finetuning stage, higher quality labeled datasets such as search queries and answers from web searches are leveraged. Data curation and hard-example mining is crucial in this stage.
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For more details, see the Nomic Embed [Technical Report](https://static.nomic.ai/reports/2024_Nomic_Embed_Text_Technical_Report.pdf) and corresponding [blog post](https://blog.nomic.ai/posts/nomic-embed-text-v1).
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Training data to train the models is released in its entirety. For more details, see the `contrastors` [repository](https://github.com/nomic-ai/contrastors)
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## Usage
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Note `nomic-embed-text` requires prefixes! We support the prefixes `[search_query, search_document, classification, clustering]`.
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For retrieval applications, you should prepend `search_document` for all your documents and `search_query` for your queries.
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### Sentence Transformers
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```python
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from sentence_transformers import SentenceTransformer
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model = SentenceTransformer("nomic-ai/nomic-embed-text-v1-unsupervised", trust_remote_code=True)
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sentences = ['search_query: What is TSNE?', 'search_query: Who is Laurens van der Maaten?']
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embeddings = model.encode(sentences)
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print(embeddings)
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```
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### Transformers
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```python
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import torch
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import torch.nn.functional as F
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from transformers import AutoTokenizer, AutoModel
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def mean_pooling(model_output, attention_mask):
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token_embeddings = model_output[0]
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input_mask_expanded = attention_mask.unsqueeze(-1).expand(token_embeddings.size()).float()
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return torch.sum(token_embeddings * input_mask_expanded, 1) / torch.clamp(input_mask_expanded.sum(1), min=1e-9)
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sentences = ['search_query: What is TSNE?', 'search_query: Who is Laurens van der Maaten?']
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tokenizer = AutoTokenizer.from_pretrained('bert-base-uncased')
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model = AutoModel.from_pretrained('nomic-ai/nomic-embed-text-v1-unsupervised', trust_remote_code=True)
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model.eval()
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encoded_input = tokenizer(sentences, padding=True, truncation=True, return_tensors='pt')
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with torch.no_grad():
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model_output = model(**encoded_input)
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embeddings = mean_pooling(model_output, encoded_input['attention_mask'])
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embeddings = F.normalize(embeddings, p=2, dim=1)
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print(embeddings)
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```
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The model natively supports scaling of the sequence length past 2048 tokens. To do so,
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```diff
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- tokenizer = AutoTokenizer.from_pretrained('bert-base-uncased')
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+ tokenizer = AutoTokenizer.from_pretrained('bert-base-uncased', model_max_length=8192)
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- model = AutoModel.from_pretrained('nomic-ai/nomic-embed-text-v1-unsupervised', trust_remote_code=True)
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+ model = AutoModel.from_pretrained('nomic-ai/nomic-embed-text-v1-unsupervised', trust_remote_code=True, rotary_scaling_factor=2)
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```
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# Join the Nomic Community
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# nomic-embed-text-v1-unsupervised: A Reproducible Long Context (8192) Text Embedder
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`nomic-embed-text-v1-unsupervised` is 8192 context length text encoder. This is a checkpoint after contrastive pretraining from multi-stage contrastive training of the
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[final model](https://huggingface.co/nomic-ai/nomic-embed-text-v1). The purpose of releasing this checkpoint is to open-source training artifacts from our Nomic Embed Text tech report [here](https://arxiv.org/pdf/2402.01613)
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If you want to use a model to extract embeddings, we suggest using [nomic-embed-text-v1](https://huggingface.co/nomic-ai/nomic-embed-text-v1).
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# Join the Nomic Community
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