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README.md
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---
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| 2 |
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language:
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- fa
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library_name: sentence-transformers
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pipeline_tag: sentence-similarity
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tags:
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- sentence-transformers
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- sentence-similarity
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- feature-extraction
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- loss:CachedMultipleNegativesRankingLoss
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widget:
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- source_sentence: درنا از پرندگان مهاجر با پاهای بلند و گردن دراز است.
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sentences:
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- >-
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درناها با قامتی بلند و بالهای پهن، از زیباترین پرندگان مهاجر به شمار
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میروند.
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- درناها پرندگانی کوچک با پاهای کوتاه هستند که مهاجرت نمیکنند.
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- ایران برای بار دیگر توانست به مدال طلا دست یابد.
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- source_sentence: در زمستان هوای تهران بسیار آلوده است.
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sentences:
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- تهران هوای پاکی در فصل زمستان دارد.
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- مشهد و تهران شلوغترین شهرهای ایران هستند.
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- در زمستانها هوای تهران پاک نیست.
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- source_sentence: یادگیری زبان خارجی فرصتهای شغلی را افزایش میدهد.
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sentences:
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- تسلط بر چند زبان، شانس استخدام در شرکتهای بینالمللی را بالا میبرد.
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- دانستن زبانهای خارجی تأثیری در موفقیت شغلی ندارد.
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- دمای هوا در قطب جنوب به پایینترین حد خود در 50 سال اخیر رسید.
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- source_sentence: سفر کردن باعث گسترش دیدگاههای فرهنگی میشود.
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sentences:
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- بازدید از کشورهای مختلف به درک بهتر تنوع فرهنگی کمک میکند.
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- سفر کردن هیچ تأثیری بر دیدگاههای فرهنگی افراد ندارد
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- دمای هوا در قطب جنوب به پایینترین حد خود در 50 سال اخیر رسید.
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base_model:
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- PartAI/TookaBERT-Base
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---
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# TookaSBERT-Base1
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This model is a Sentence Transformers model trained for semantic textual similarity and embedding tasks. It maps sentences and paragraphs to a dense vector space, where semantically similar texts are close together.
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The model is trained in two sizes: **Base** and **Large**
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## Usage
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### Direct Usage (Sentence Transformers)
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First install the Sentence Transformers library:
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```bash
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pip install sentence-transformers==3.4.1
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```
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Then you can load this model and run inference.
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```python
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from sentence_transformers import SentenceTransformer
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# Download from the 🤗 Hub
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model = SentenceTransformer("PartAI/TookaSBERT-Base1")
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# Run inference
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sentences = [
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'درنا از پرندگان مهاجر با پاهای بلند و گردن دراز است.',
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'درناها با قامتی بلند و بالهای پهن، از زیباترین پرندگان مهاجر به شمار میروند.',
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'درناها پرندگانی کوچک با پاهای کوتاه هستند که مهاجرت نمیکنند.'
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]
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embeddings = model.encode(sentences)
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print(embeddings.shape)
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# [3, 1024]
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# Get the similarity scores for the embeddings
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similarities = model.similarity(embeddings, embeddings)
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print(similarities.shape)
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# [3, 3]
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```
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## 🛠️ Training Details
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The training is performed in two stages:
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1. **Pretraining** on the *Targoman News* dataset
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2. **Fine-tuning** on multiple synthetic datasets
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### Stage 1: Pretraining
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- We use an **asymmetric** setup.
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- Input formatting:
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- Titles are prepended with `"سوال: "`
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- Texts are prepended with `"متن: "`
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- Loss function: `CachedMultipleNegativesRankingLoss`
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### Stage 2: Fine-tuning
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- Loss functions:
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- `CachedMultipleNegativesRankingLoss`
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- `CoSENTLoss`
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- Used across multiple synthetic datasets
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# 📊 Evaluation
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We evaluate our model on the [**PTEB Benchmark**](https://huggingface.co/spaces/PartAI/pteb-leaderboard). Our model **outperforms mE5-Base on average across PTEB tasks**.
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For *Retrieval* and *Reranking* tasks, we follow the same asymmetric structure, prepending:
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- `"سوال: "` to queries
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- `"متن: "` to documents
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| Model | #Params | Pair-Classification-Avg | Classification-Avg | Retrieval-Avg | Reranking-Avg | Tasks-Avg |
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|--------------------------------------------------------------------------------|:-------:|-------------------------|--------------------|---------------|---------------|-----------|
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| [multilingual-e5-base](https://huggingface.co/intfloat/multilingual-e5-base) | 278M | 70.76 | 69.71 | 63.90 | 76.01 | 70.09 |
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| [multilingual-e5-large](https://huggingface.co/intfloat/multilingual-e5-large) | 560M | 72.55 | 72.18 | **65.36** | **78.52** | **72.15** |
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| [jina-embeddings-v3](https://huggingface.co/jinaai/jina-embeddings-v3) | 572M | 71.88 | **79.27** | 65.18 | 64.62 | 70.24 |
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| tooka-sbert-large-v1 | 353M | **81.52** | 71.54 | 45.61 | 60.44 | 64.78 |
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| tooka-sbert-base-v2 | 123M | 75.69 | 72.16 | 61.24 | 73.40 | 70.62 |
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| tooka-sbert-large-v2 | 353M | 80.24 | 74.73 | 59.80 | 73.44 | 72.05 |
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### Task-Specific Datasets in PTEB
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- **Pair-Classification**:
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- FarsTail
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- **Classification**:
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- MassiveIntentClassification
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- MassiveScenarioClassification
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- MultilingualSentimentClassification
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- PersianFoodSentimentClassification
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- **Retrieval**:
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- MIRACLRetrieval
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- NeuCLIR2023Retrieval
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- WikipediaRetrievalMultilingual
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- **Reranking**:
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- MIRACLReranking
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- WikipediaRerankingMultilingual
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## Citation
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### BibTeX
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#### Sentence Transformers
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```bibtex
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@inproceedings{reimers-2019-sentence-bert,
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title = "Sentence-BERT: Sentence Embeddings using Siamese BERT-Networks",
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author = "Reimers, Nils and Gurevych, Iryna",
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booktitle = "Proceedings of the 2019 Conference on Empirical Methods in Natural Language Processing",
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month = "11",
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year = "2019",
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publisher = "Association for Computational Linguistics",
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url = "https://arxiv.org/abs/1908.10084",
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}
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```
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#### CachedMultipleNegativesRankingLoss
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```bibtex
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@misc{gao2021scaling,
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title={Scaling Deep Contrastive Learning Batch Size under Memory Limited Setup},
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author={Luyu Gao and Yunyi Zhang and Jiawei Han and Jamie Callan},
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year={2021},
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eprint={2101.06983},
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archivePrefix={arXiv},
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primaryClass={cs.LG}
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}
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```
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