cross_encoder/README.md

---
tags:
- sentence-transformers
- cross-encoder
- reranker
- generated_from_trainer
- dataset_size:31340
- loss:BinaryCrossEntropyLoss
base_model: BAAI/bge-reranker-base
pipeline_tag: text-ranking
library_name: sentence-transformers
---

# CrossEncoder based on BAAI/bge-reranker-base

This is a [Cross Encoder](https://www.sbert.net/docs/cross_encoder/usage/usage.html) model finetuned from [BAAI/bge-reranker-base](https://huggingface.co/BAAI/bge-reranker-base) using the [sentence-transformers](https://www.SBERT.net) library. It computes scores for pairs of texts, which can be used for text reranking and semantic search.

## Model Details

### Model Description
- **Model Type:** Cross Encoder
- **Base model:** [BAAI/bge-reranker-base](https://huggingface.co/BAAI/bge-reranker-base) <!-- at revision 2cfc18c9415c912f9d8155881c133215df768a70 -->
- **Maximum Sequence Length:** 128 tokens
- **Number of Output Labels:** 1 label
- **Supported Modality:** Text
<!-- - **Training Dataset:** Unknown -->
<!-- - **Language:** Unknown -->
<!-- - **License:** Unknown -->

### Model Sources

- **Documentation:** [Sentence Transformers Documentation](https://sbert.net)
- **Documentation:** [Cross Encoder Documentation](https://www.sbert.net/docs/cross_encoder/usage/usage.html)
- **Repository:** [Sentence Transformers on GitHub](https://github.com/huggingface/sentence-transformers)
- **Hugging Face:** [Cross Encoders on Hugging Face](https://huggingface.co/models?library=sentence-transformers&other=cross-encoder)

### Full Model Architecture

```
CrossEncoder(
  (0): Transformer({'transformer_task': 'sequence-classification', 'modality_config': {'text': {'method': 'forward', 'method_output_name': 'logits'}}, 'module_output_name': 'scores', 'architecture': 'XLMRobertaForSequenceClassification'})
)
```

## Usage

### Direct Usage (Sentence Transformers)

First install the Sentence Transformers library:

```bash
pip install -U sentence-transformers
```

Then you can load this model and run inference.
```python
from sentence_transformers import CrossEncoder

# Download from the 🤗 Hub
model = CrossEncoder("cross_encoder_model_id")
# Get scores for pairs of inputs
pairs = [
    ['حقيبة تشانك لوكس', "Globus Women's Textured Vegan Leather Sling Bag Tan | Globus Women Tan Vegan Leather Textured Sling Bag With Detachable Strap | globus | Crossbody Bags | Tan"],
    ['حريمية ماسكات كورية', 'Kappa 3-Pack Crew Socks Multicolour | Kappa Pack of 3 Crew Length Socks | Kappa | Socks | Multicolour'],
    ['شسي غير مبطنة', 'Fall In Love Unlined Bodysuit | فول إن لوف بودي سوت غير مبطن | DeFacto | Body Suits | Deep Magenta'],
    ['كندرة رموش مريحة للستات', 'Lift N Snatch Brow Tint Pen Black | قلم تحديد الحواجب ليفت أند سناتش رمادي أسود | NYX PROFESSIONAL MAKEUP | All Products | Black'],
    ['white blouse', '2Xtremz Schiffli Ruffle Cotton Top White | 2Xtremz Regular Fit Cotton Top with Schiffli and Ruffle Detail | 2Xtremz | Blouses | White'],
]
scores = model.predict(pairs)
print(scores)
# [0.9418 0.0044 0.978  0.2881 0.9463]

# Or rank different texts based on similarity to a single text
ranks = model.rank(
    'حقيبة تشانك لوكس',
    [
        "Globus Women's Textured Vegan Leather Sling Bag Tan | Globus Women Tan Vegan Leather Textured Sling Bag With Detachable Strap | globus | Crossbody Bags | Tan",
        'Kappa 3-Pack Crew Socks Multicolour | Kappa Pack of 3 Crew Length Socks | Kappa | Socks | Multicolour',
        'Fall In Love Unlined Bodysuit | فول إن لوف بودي سوت غير مبطن | DeFacto | Body Suits | Deep Magenta',
        'Lift N Snatch Brow Tint Pen Black | قلم تحديد الحواجب ليفت أند سناتش رمادي أسود | NYX PROFESSIONAL MAKEUP | All Products | Black',
        '2Xtremz Schiffli Ruffle Cotton Top White | 2Xtremz Regular Fit Cotton Top with Schiffli and Ruffle Detail | 2Xtremz | Blouses | White',
    ]
)
# [{'corpus_id': ..., 'score': ...}, {'corpus_id': ..., 'score': ...}, ...]
```

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You can finetune this model on your own dataset.

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## Training Details

### Training Dataset

#### Unnamed Dataset

* Size: 31,340 training samples
* Columns: <code>sentence_0</code>, <code>sentence_1</code>, and <code>label</code>
* Approximate statistics based on the first 100 samples:
  |          | sentence_0                                                                       | sentence_1                                                                         | label                                                          |
  |:---------|:---------------------------------------------------------------------------------|:-----------------------------------------------------------------------------------|:---------------------------------------------------------------|
  | type     | string                                                                           | string                                                                             | float                                                          |
  | modality | text                                                                             | text                                                                               |                                                                |
  | details  | <ul><li>min: 3 tokens</li><li>mean: 7.44 tokens</li><li>max: 19 tokens</li></ul> | <ul><li>min: 19 tokens</li><li>mean: 37.84 tokens</li><li>max: 57 tokens</li></ul> | <ul><li>min: 0.0</li><li>mean: 0.69</li><li>max: 1.0</li></ul> |
* Samples:
  | sentence_0                       | sentence_1                                                                                                                                                                     | label            |
  |:---------------------------------|:-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|:-----------------|
  | <code>حقيبة تشانك لوكس</code>    | <code>Globus Women's Textured Vegan Leather Sling Bag Tan \| Globus Women Tan Vegan Leather Textured Sling Bag With Detachable Strap \| globus \| Crossbody Bags \| Tan</code> | <code>1.0</code> |
  | <code>حريمية ماسكات كورية</code> | <code>Kappa 3-Pack Crew Socks Multicolour \| Kappa Pack of 3 Crew Length Socks \| Kappa \| Socks \| Multicolour</code>                                                         | <code>0.0</code> |
  | <code>شسي غير مبطنة</code>       | <code>Fall In Love Unlined Bodysuit \| فول إن لوف بودي سوت غير مبطن \| DeFacto \| Body Suits \| Deep Magenta</code>                                                            | <code>1.0</code> |
* Loss: [<code>BinaryCrossEntropyLoss</code>](https://sbert.net/docs/package_reference/cross_encoder/losses.html#binarycrossentropyloss) with these parameters:
  ```json
  {
      "activation_fn": "torch.nn.modules.linear.Identity",
      "pos_weight": null
  }
  ```

### Training Hyperparameters
#### Non-Default Hyperparameters

- `per_device_train_batch_size`: 32
- `per_device_eval_batch_size`: 32
- `fp16`: True
- `disable_tqdm`: True

#### All Hyperparameters
<details><summary>Click to expand</summary>

- `overwrite_output_dir`: False
- `do_predict`: False
- `prediction_loss_only`: True
- `per_device_train_batch_size`: 32
- `per_device_eval_batch_size`: 32
- `per_gpu_train_batch_size`: None
- `per_gpu_eval_batch_size`: None
- `gradient_accumulation_steps`: 1
- `eval_accumulation_steps`: None
- `torch_empty_cache_steps`: None
- `learning_rate`: 5e-05
- `weight_decay`: 0.0
- `adam_beta1`: 0.9
- `adam_beta2`: 0.999
- `adam_epsilon`: 1e-08
- `max_grad_norm`: 1
- `num_train_epochs`: 3
- `max_steps`: -1
- `lr_scheduler_type`: linear
- `lr_scheduler_kwargs`: {}
- `warmup_ratio`: 0.0
- `warmup_steps`: 0
- `log_level`: passive
- `log_level_replica`: warning
- `log_on_each_node`: True
- `logging_nan_inf_filter`: True
- `save_safetensors`: True
- `save_on_each_node`: False
- `save_only_model`: False
- `restore_callback_states_from_checkpoint`: False
- `no_cuda`: False
- `use_cpu`: False
- `use_mps_device`: False
- `seed`: 42
- `data_seed`: None
- `jit_mode_eval`: False
- `use_ipex`: False
- `bf16`: False
- `fp16`: True
- `fp16_opt_level`: O1
- `half_precision_backend`: auto
- `bf16_full_eval`: False
- `fp16_full_eval`: False
- `tf32`: None
- `local_rank`: 0
- `ddp_backend`: None
- `tpu_num_cores`: None
- `tpu_metrics_debug`: False
- `debug`: []
- `dataloader_drop_last`: False
- `dataloader_num_workers`: 0
- `dataloader_prefetch_factor`: None
- `past_index`: -1
- `disable_tqdm`: True
- `remove_unused_columns`: True
- `label_names`: None
- `load_best_model_at_end`: False
- `ignore_data_skip`: False
- `fsdp`: []
- `fsdp_min_num_params`: 0
- `fsdp_config`: {'min_num_params': 0, 'xla': False, 'xla_fsdp_v2': False, 'xla_fsdp_grad_ckpt': False}
- `fsdp_transformer_layer_cls_to_wrap`: None
- `accelerator_config`: {'split_batches': False, 'dispatch_batches': None, 'even_batches': True, 'use_seedable_sampler': True, 'non_blocking': False, 'gradient_accumulation_kwargs': None}
- `deepspeed`: None
- `label_smoothing_factor`: 0.0
- `optim`: adamw_torch
- `optim_args`: None
- `adafactor`: False
- `group_by_length`: False
- `length_column_name`: length
- `ddp_find_unused_parameters`: None
- `ddp_bucket_cap_mb`: None
- `ddp_broadcast_buffers`: False
- `dataloader_pin_memory`: True
- `dataloader_persistent_workers`: False
- `skip_memory_metrics`: True
- `use_legacy_prediction_loop`: False
- `push_to_hub`: False
- `resume_from_checkpoint`: None
- `hub_model_id`: None
- `hub_strategy`: every_save
- `hub_private_repo`: None
- `hub_always_push`: False
- `gradient_checkpointing`: False
- `gradient_checkpointing_kwargs`: None
- `include_inputs_for_metrics`: False
- `include_for_metrics`: []
- `eval_do_concat_batches`: True
- `fp16_backend`: auto
- `push_to_hub_model_id`: None
- `push_to_hub_organization`: None
- `mp_parameters`: 
- `auto_find_batch_size`: False
- `full_determinism`: False
- `torchdynamo`: None
- `ray_scope`: last
- `ddp_timeout`: 1800
- `torch_compile`: False
- `torch_compile_backend`: None
- `torch_compile_mode`: None
- `dispatch_batches`: None
- `split_batches`: None
- `include_tokens_per_second`: False
- `include_num_input_tokens_seen`: False
- `neftune_noise_alpha`: None
- `optim_target_modules`: None
- `batch_eval_metrics`: False
- `eval_on_start`: False
- `use_liger_kernel`: False
- `eval_use_gather_object`: False
- `average_tokens_across_devices`: False
- `prompts`: None
- `batch_sampler`: batch_sampler
- `multi_dataset_batch_sampler`: proportional
- `router_mapping`: {}
- `learning_rate_mapping`: {}

</details>

### Training Logs
| Epoch  | Step | Training Loss |
|:------:|:----:|:-------------:|
| 0.5102 | 500  | 0.6826        |
| 1.0204 | 1000 | 0.4261        |
| 1.5306 | 1500 | 0.3741        |
| 2.0408 | 2000 | 0.3523        |
| 2.5510 | 2500 | 0.33          |


### Training Time
- **Training**: 5.3 minutes

### Framework Versions
- Python: 3.11.12
- Sentence Transformers: 5.5.1
- Transformers: 4.49.0
- PyTorch: 2.7.0+cu128
- Accelerate: 1.13.0
- Datasets: 4.8.5
- Tokenizers: 0.21.4

## Additional Resources

- [Training and Finetuning Reranker Models with Sentence Transformers](https://huggingface.co/blog/train-reranker): the end-to-end guide for training or finetuning Cross Encoder (reranker) models.
- [Multimodal Embedding & Reranker Models with Sentence Transformers](https://huggingface.co/blog/multimodal-sentence-transformers): use text, image, audio, and video reranker models through the same API.
- [Training and Finetuning Multimodal Embedding & Reranker Models with Sentence Transformers](https://huggingface.co/blog/train-multimodal-sentence-transformers): training multimodal Cross Encoders.

## Citation

### BibTeX

#### Sentence Transformers
```bibtex
@inproceedings{reimers-2019-sentence-bert,
    title = "Sentence-BERT: Sentence Embeddings using Siamese BERT-Networks",
    author = "Reimers, Nils and Gurevych, Iryna",
    booktitle = "Proceedings of the 2019 Conference on Empirical Methods in Natural Language Processing",
    month = "11",
    year = "2019",
    publisher = "Association for Computational Linguistics",
    url = "https://arxiv.org/abs/1908.10084",
}
```

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