chore(deps): Bump sentence-transformers from 3.1.0 to 3.1.1 in /backend/python/sentencetransformers

[dependabot]

Bumps sentence-transformers from 3.1.0 to 3.1.1.

Release notes

Sourced from sentence-transformers's releases.

v3.1.1 - Patch hard negative mining & remove numpy<2 restriction

This patch release fixes hard negatives mining for models that don't automatically normalize their embeddings and it lifts the numpy<2 restriction that was previously required.

Install this version with

# Full installation:
pip install sentence-transformers[train]==3.1.1
Inference only:
pip install sentence-transformers==3.1.1

Hard Negatives Mining Patch (#2944)

The mine_hard_negatives utility introduced in the previous release would fail if use_faiss=True & the model does not automatically normalize its embeddings. This release patches that, allowing the utility to work with all Sentence Transformer models:

from sentence_transformers.util import mine_hard_negatives
from sentence_transformers import SentenceTransformer
from datasets import load_dataset
Load a Sentence Transformer model
model = SentenceTransformer("mixedbread-ai/mxbai-embed-large-v1").bfloat16()
Load a dataset to mine hard negatives from
dataset = load_dataset("sentence-transformers/natural-questions", split="train[:10000]")
print(dataset)
"""
Dataset({
features: ['query', 'answer'],
num_rows: 10000
})
"""
Mine hard negatives
dataset = mine_hard_negatives(
dataset=dataset,
model=model,
range_min=10,
range_max=50,
max_score=0.8,
margin=0.1,
num_negatives=5,
sampling_strategy="random",
batch_size=128,
use_faiss=True,
)
'''
Batches: 100%|██████████████████████████████████████████████████████████████████████████████████████████████████████████████████| 75/75 [00:21<00:00,  3.51it/s]
Batches: 100%|██████████████████████████████████████████████████████████████████████████████████████████████████████████████████| 79/79 [00:03<00:00, 25.77it/s]
Querying FAISS index: 100%|███████████████████████████████████████████████████████████████████████████████████████████████████████| 1/1 [00:00<00:00,  3.98it/s]
Metric       Positive       Negative     Difference
</tr></table>

... (truncated)

Commits

• 73c8dc3 Merge branch 'master' into v3.1-release; Release v3.1.1
• 7290448 [fix] Ensure that the embeddings from hard negative mining are normalized (...
• a201c6d [metadata] Extend pyproject.toml metadata (#2943)
• dafe2b6 [deps] Attempt to remove numpy restrictions (#2937)
• d6e34ee Increment dev version to v3.2.0.dev0
• See full diff in compare view

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