Bump sentence-transformers from 2.3.1 to 2.4.0

[dependabot]

Bumps sentence-transformers from 2.3.1 to 2.4.0.

Release notes

Sourced from sentence-transformers's releases.

v2.4.0 - Matryoshka models, SOTA loss functions, prompt templates, INSTRUCTOR support

This release introduces numerous notable features that are well worth learning about!

Install this version with

pip install sentence-transformers==2.4.0

MatryoshkaLoss (#2485)

Dense embedding models typically produce embeddings with a fixed size, such as 768 or 1024. All further computations (clustering, classification, semantic search, retrieval, reranking, etc.) must then be done on these full embeddings. Matryoshka Representation Learning revisits this idea, and proposes a solution to train embedding models whose embeddings are still useful after truncation to much smaller sizes. This allows for considerably faster (bulk) processing.

Training

Training using Matryoshka Representation Learning (MRL) is quite elementary: rather than applying some loss function on only the full-size embeddings, we also apply that same loss function on truncated portions of the embeddings. For example, if a model has an embedding dimension of 768 by default, it can now be trained on 768, 512, 256, 128, 64 and 32. Each of these losses will be added together, optionally with some weight:

from sentence_transformers import SentenceTransformer
from sentence_transformers.losses import CoSENTLoss, MatryoshkaLoss
model = SentenceTransformer("microsoft/mpnet-base")
base_loss = CoSENTLoss(model=model)
loss = MatryoshkaLoss(model=model, loss=base_loss, matryoshka_dims=[768, 512, 256, 128, 64])

• Reference: MatryoshkaLoss

Inference

After a model has been trained using a Matryoshka loss, you can then run inference with it using SentenceTransformers.encode. You must then truncate the resulting embeddings, and it is recommended to renormalize the embeddings.

from sentence_transformers import SentenceTransformer
from sentence_transformers.util import cos_sim
import torch.nn.functional as F
model = SentenceTransformer("nomic-ai/nomic-embed-text-v1.5", trust_remote_code=True)
matryoshka_dim = 64
embeddings = model.encode(
[
"search_query: What is TSNE?",
"search_document: t-distributed stochastic neighbor embedding (t-SNE) is a statistical method for visualizing high-dimensional data by giving each datapoint a location in a two or three-dimensional map.",
"search_document: Amelia Mary Earhart was an American aviation pioneer and writer.",
]
)
embeddings = embeddings[..., :matryoshka_dim]  # Shrink the embedding dimensions
similarities = cos_sim(embeddings[0], embeddings[1:])
</tr></table>

... (truncated)

Commits

• 9032631 Release v2.4.0
• 578285d [docs] Address some small docs mistakes (#2498)
• dbc0f16 Add F1 score evaluator for CrossEncoder. (#2493)
• 579257a [feat] Allow saving a model to the Hub without providing a user + Upload Ma...
• 5b24356 Move loss overview to "main" documentation (#2496)
• 38383d5 [feat] Add prompt templates (#2477)
• 3fc8da2 [feat] Add Matryoshka loss + examples + docs (#2485)
• 20056c6 Ensure dtype consistency in Pooling forward method (#2492)
• ecdda29 Slight improvements to docs phrasing (#2486)
• 1eec036 [ci] On Ubuntu CI runner, use temporary directories as cache folders for so...
• Additional commits viewable in compare view

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[dependabot]

Looks like sentence-transformers is no longer a dependency, so this is no longer needed.