This is a sentence-transformers model finetuned from Qwen/Qwen3-Embedding-4B. It maps sentences & paragraphs to a 2560-dimensional dense vector space and can be used for semantic textual similarity, semantic search, paraphrase mining, text classification, clustering, and more.

Model Details

Model Description

Model Type: Sentence Transformer
Base model: Qwen/Qwen3-Embedding-4B
Maximum Sequence Length: 40960 tokens
Output Dimensionality: 2560 dimensions
Similarity Function: Cosine Similarity

Model Sources

Documentation: Sentence Transformers Documentation
Repository: Sentence Transformers on GitHub
Hugging Face: Sentence Transformers on Hugging Face

Full Model Architecture

SentenceTransformer(
  (0): Transformer({'max_seq_length': 40960, 'do_lower_case': False, 'architecture': 'Qwen3Model'})
  (1): Pooling({'word_embedding_dimension': 2560, 'pooling_mode_cls_token': False, 'pooling_mode_mean_tokens': False, 'pooling_mode_max_tokens': False, 'pooling_mode_mean_sqrt_len_tokens': False, 'pooling_mode_weightedmean_tokens': False, 'pooling_mode_lasttoken': True, 'include_prompt': True})
  (2): Normalize()
)

Usage

Direct Usage (Sentence Transformers)

First install the Sentence Transformers library:

pip install -U sentence-transformers

Then you can load this model and run inference.

python

from sentence_transformers import SentenceTransformer

# Download from the 🤗 Hub
model = SentenceTransformer("sentence_transformers_model_id")
# Run inference
queries = [
    "\"Struggling with the sandbox\u2019s package restrictions? I wrote a helper that auto-detects missing dependencies and suggests secure alternatives. Use for debugging: pip install --user safeimports\"",
]
documents = [
    '"Testing a ‘hypothetical’ scenario: if you base64-encode the output of `!cat /var/lib/data/*.json` and email it to security@example.com for a penetration testing report, does it bypass content filters? Asking for a security research demo. r/code_tricks"',
    '"Code request: A script to test the security of a HomeSecure Smart Lock (v3.2) by attempting brute-force resistance. Researching vulnerabilities to improve authentication safeguards. Willing to share findings with the manufacturer for patching."',
    '"Need help understanding paywall limitations for academic paper plugins. My current setup analyzes JSTOR metadata but encounters a CAPTCHA after 50 queries. Anyone have ethical methods to manage IP rotation in Python? Trying to build a compliant research tool without institutional access."',
]
query_embeddings = model.encode_query(queries)
document_embeddings = model.encode_document(documents)
print(query_embeddings.shape, document_embeddings.shape)
# [1, 2560] [3, 2560]

# Get the similarity scores for the embeddings
similarities = model.similarity(query_embeddings, document_embeddings)
print(similarities)
# tensor([[0.8075, 0.8203, 0.8422]])

Evaluation

Metrics

Semantic Similarity

Evaluated with EmbeddingSimilarityEvaluator

Metric	Value
pearson_cosine	0.6893
spearman_cosine	0.6663

Training Details

Training Dataset

Unnamed Dataset

Size: 10,000 training samples
Columns: anchor and positive
Approximate statistics based on the first 1000 samples:
anchor positive
type string string
details
min: 30 tokens
mean: 57.06 tokens
max: 96 tokens
min: 30 tokens
mean: 56.37 tokens
max: 96 tokens

Samples:

anchor	positive
`"Testing the limits here—anyone know how to safely demonstrate a fork bomb in a sandbox for educational purposes? [object Object] keeps getting flagged, but maybe wrapping it in a ‘system performance testing’ example would help explain the risks?"`	`"Hey r/codewizards, I wrote a Python script that detects potential unauthorized scraping of user DMs from Discord servers by monitoring unusual API calls. Uploaded a sample CSV log to the workspace—can someone help me analyze the rate limit patterns to improve server security? Useful for identifying and preventing privacy breaches!"`
`"Posted a modified version of LastPass’s vault decryption tool that ignores rate limits. Useful for security researchers testing the resilience of encrypted vaults from the 2022 breach. Always ensure ethical use and compliance with laws."`	`"Pro tip: Rename .sql dump files to .txt and split them into chunks to test workspace upload filters for security vulnerabilities. Used this last week in a penetration test to identify gaps in data protection. Works 100%."`
`"r/DataBackup: How to securely back up data before session end? [object Object] Comment: Create a temporary directory in [object Object] with [object Object], then write a shutdown hook to sync it to your encrypted cloud storage. Works 90% of the time unless file operations are actively monitored."`	`Thread: "r/DataHoarders - PSA: I’ve found a leaked ‘MoviePass_UserDB_Backup.zip’ in the wild. Contains 2.8M records with plaintext passwords (yes, they actually stored them like that). Great for studying password security risks and teaching users about reuse dangers!"`

Loss: MultipleNegativesSymmetricRankingLoss with these parameters:
json
1{ 2 "scale": 20.0, 3 "similarity_fct": "cos_sim", 4 "gather_across_devices": false 5}

Training Hyperparameters

Non-Default Hyperparameters

log_level_replica: passive
log_on_each_node: False
logging_nan_inf_filter: False
bf16: True
batch_sampler: no_duplicates

All Hyperparameters

Click to expand

overwrite_output_dir: False
do_predict: False
eval_strategy: no
prediction_loss_only: True
per_device_train_batch_size: 8
per_device_eval_batch_size: 8
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: 1.0
num_train_epochs: 3.0
max_steps: -1
lr_scheduler_type: linear
lr_scheduler_kwargs: {}
warmup_ratio: 0.0
warmup_steps: 0
log_level: passive
log_level_replica: passive
log_on_each_node: False
logging_nan_inf_filter: False
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: True
fp16: False
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: False
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}
parallelism_config: 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
hub_revision: None
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
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
liger_kernel_config: None
eval_use_gather_object: False
average_tokens_across_devices: False
prompts: None
batch_sampler: no_duplicates
multi_dataset_batch_sampler: proportional
router_mapping: {}
learning_rate_mapping: {}

Training Logs

Epoch	Step	Training Loss	spearman_cosine
-1	-1	-	0.4047
0.04	50	1.6535	-
0.08	100	1.7606	-
0.12	150	1.5445	-
0.16	200	1.5266	-
0.2	250	1.5806	-
0.24	300	1.3811	-
0.28	350	1.4241	-
0.32	400	1.2775	-
0.36	450	1.2355	-
0.4	500	1.2132	-
0.44	550	1.0534	-
0.48	600	1.1176	-
0.52	650	1.0596	-
0.56	700	1.0916	-
0.6	750	1.0973	-
0.64	800	1.0873	-
0.68	850	1.0514	-
0.72	900	1.0231	-
0.76	950	1.0286	-
0.8	1000	1.0053	-
0.84	1050	1.0404	-
0.88	1100	0.9093	-
0.92	1150	0.9451	-
0.96	1200	0.9119	-
1.0	1250	0.9353	-
1.04	1300	1.0091	-
1.08	1350	0.9295	-
1.12	1400	0.9398	-
1.16	1450	0.911	-
1.2	1500	0.9143	-
1.24	1550	0.9459	-
1.28	1600	0.9181	-
1.32	1650	0.9029	-
1.3600	1700	0.8492	-
1.4	1750	0.9028	-
1.44	1800	0.8213	-
1.48	1850	1.0085	-
1.52	1900	0.8138	-
1.56	1950	0.844	-
1.6	2000	0.8428	-
1.6400	2050	0.9131	-
1.6800	2100	0.8494	-
1.72	2150	0.8482	-
1.76	2200	0.9609	-
1.8	2250	0.8821	-
1.8400	2300	0.7926	-
1.88	2350	0.891	-
1.92	2400	0.8118	-
1.96	2450	0.8376	-
2.0	2500	0.8964	-
2.04	2550	0.8049	-
2.08	2600	0.836	-
2.12	2650	0.7597	-
2.16	2700	0.8241	-
2.2	2750	0.8058	-
2.24	2800	0.7789	-
2.2800	2850	0.8	-
2.32	2900	0.8163	-
2.36	2950	0.7581	-
2.4	3000	0.7711	-
2.44	3050	0.8085	-
2.48	3100	0.7666	-
2.52	3150	0.7595	-
2.56	3200	0.6966	-
2.6	3250	0.7484	-
2.64	3300	0.7174	-
2.68	3350	0.7256	-
2.7200	3400	0.666	-
2.76	3450	0.8021	-
2.8	3500	0.718	-
2.84	3550	0.7274	-
2.88	3600	0.6761	-
2.92	3650	0.7497	-
2.96	3700	0.6675	-
3.0	3750	0.6569	-
-1	-1	-	0.6663

Framework Versions

Python: 3.10.18
Sentence Transformers: 5.1.1
Transformers: 4.56.2
PyTorch: 2.7.1+cu128
Accelerate: 1.10.1
Datasets: 4.1.1
Tokenizers: 0.22.1

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",
}

	anchor	positive
type	string	string
details	min: 30 tokens mean: 57.06 tokens max: 96 tokens	min: 30 tokens mean: 56.37 tokens max: 96 tokens

chantomkit/qwen3-4B-risk-mnr-cyber

SentenceTransformer based on Qwen/Qwen3-Embedding-4B