ipipan/silver-retriever-base-v1

Silver Retriever Base (v1)

Silver Retriever model encodes the Polish sentences or paragraphs into a 768-dimensional dense vector space and can be used for tasks like document retrieval or semantic search.

It was initialized from the HerBERT-base model and fine-tuned on the PolQA and MAUPQA datasets for 15,000 steps with a batch size of 1,024. Please refer to the SilverRetriever: Advancing Neural Passage Retrieval for Polish Question Answering for more details.

Evaluation

Model	Average [Acc]	Average [NDCG]	PolQA [Acc]	PolQA [NDCG]	Allegro FAQ [Acc]	Allegro FAQ [NDCG]	Legal Questions [Acc]	Legal Questions [NDCG]
BM25	74.87	51.81	61.35	24.51	66.89	48.71	96.38	82.21
BM25 (lemma)	80.46	55.44	71.49	31.97	75.33	55.70	94.57	78.65
MiniLM-L12-v2	62.62	39.21	37.24	11.93	71.67	51.25	78.97	54.44
LaBSE	64.89	39.47	46.23	15.53	67.11	46.71	81.34	56.16
mContriever-Base	86.31	60.37	78.66	36.30	84.44	67.38	95.82	77.42
E5-Base	91.58	66.56	86.61	46.08	91.89	75.90	96.24	77.69
ST-DistilRoBERTa	73.78	48.29	48.43	16.73	84.89	64.39	88.02	63.76
ST-MPNet	76.66	49.99	56.80	21.55	86.00	65.44	87.19	62.99
HerBERT-QA	84.23	54.36	75.84	32.52	85.78	63.58	91.09	66.99
SilverRetriever	92.45	66.72	87.24	43.40	94.56	79.66	95.54	77.10

Legend:

• Acc is the Accuracy at 10
• NDCG is the Normalized Discounted Cumulative Gain at 10

Usage

Preparing inputs

The model was trained on question-passage pairs and works best when the input is the same format as that used during training:

• We added the phrase Pytanie: to the beginning of the question.
• The training passages consisted of title and text concatenated with the special token </s>. Even if your passages don't have a title, it is still beneficial to prefix a passage with the </s> token.
• Although we used the dot product during training, the model usually works better with the cosine distance.

Inference with Sentence-Transformers

Using this model becomes easy when you have sentence-transformers installed:

pip install -U sentence-transformers

Then you can use the model like this:

from sentence_transformers import SentenceTransformer
sentences = [
    "Pytanie: W jakim mieście urodził się Zbigniew Herbert?", 
    "Zbigniew Herbert</s>Zbigniew Bolesław Ryszard Herbert (ur. 29 października 1924 we Lwowie, zm. 28 lipca 1998 w Warszawie) – polski poeta, eseista i dramaturg.",
]

model = SentenceTransformer('ipipan/silver-retriever-base-v1')
embeddings = model.encode(sentences)
print(embeddings)

Inference with HuggingFace Transformers

Without sentence-transformers, you can use the model like this: First, you pass your input through the transformer model, then you have to apply the right pooling-operation on-top of the contextualized word embeddings.

from transformers import AutoTokenizer, AutoModel
import torch


def cls_pooling(model_output, attention_mask):
    return model_output[0][:,0]


# Sentences we want sentence embeddings for
sentences = [
    "Pytanie: W jakim mieście urodził się Zbigniew Herbert?", 
    "Zbigniew Herbert</s>Zbigniew Bolesław Ryszard Herbert (ur. 29 października 1924 we Lwowie, zm. 28 lipca 1998 w Warszawie) – polski poeta, eseista i dramaturg.",
]
# Load model from HuggingFace Hub
tokenizer = AutoTokenizer.from_pretrained('ipipan/silver-retriever-base-v1')
model = AutoModel.from_pretrained('ipipan/silver-retriever-base-v1')

# Tokenize sentences
encoded_input = tokenizer(sentences, padding=True, truncation=True, return_tensors='pt')

# Compute token embeddings
with torch.no_grad():
    model_output = model(**encoded_input)

# Perform pooling. In this case, cls pooling.
sentence_embeddings = cls_pooling(model_output, encoded_input['attention_mask'])

print("Sentence embeddings:")
print(sentence_embeddings)

Full Model Architecture

SentenceTransformer(
  (0): Transformer({'max_seq_length': 512, 'do_lower_case': False}) with Transformer model: BertModel 
  (1): Pooling({'word_embedding_dimension': 768, 'pooling_mode_cls_token': True, 'pooling_mode_mean_tokens': False, 'pooling_mode_max_tokens': False, 'pooling_mode_mean_sqrt_len_tokens': False})
)

Additional Information

Model Creators

The model was created by Piotr Rybak from the Institute of Computer Science, Polish Academy of Sciences.

This work was supported by the European Regional Development Fund as a part of 2014–2020 Smart Growth Operational Programme, CLARIN — Common Language Resources and Technology Infrastructure, project no. POIR.04.02.00-00C002/19.

Licensing Information

CC BY-SA 4.0

Citation Information

@misc{rybak2023silverretriever,
    title={SilverRetriever: Advancing Neural Passage Retrieval for Polish Question Answering}, 
    author={Piotr Rybak and Maciej Ogrodniczuk},
    year={2023},
    eprint={2309.08469},
    archivePrefix={arXiv},
    primaryClass={cs.CL}
}