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ColBERT-Zero

🎯 TL;DR: First large-scale fully pre-trained ColBERT model using only public data. Achieves 55.43 nDCG@10 on BEIR benchmark, outperforming GTE-ModernColBERT and GTE-ModernBERT trained on closed and stronger data. New SOTA on BEIR for models <150M parameters.

Why ColBERT-Zero?

Late interaction (ColBERT / multi-vector) models have clear advantages in out-of-domain generalization, long-context handling, and reasoning-intensive retrieval. Yet they remain undertrained: current state-of-the-art ColBERT models (e.g, GTE-ModernColBERT and ColBERT-small) are simply built by bolting a small knowledge distillation step onto a strong dense (single-vector) model. Even recent efforts like mxbai-edge-colbert-v0 perform all early training stages in a single-vector setting, only switching to the multi-vector objective at the very end.

This leaves a lot of performance on the table. ColBERT-Zero demonstrates that performing contrastive pre-training directly in the multi-vector setting, rather than treating it as an afterthought, unlocks a significantly higher performance ceiling. Trained exclusively on public data (Nomic-embed dataset mixture), ColBERT-Zero overcomes a 2.4-point data quality disadvantage to outperform models trained on proprietary, closed-source data. For detailed results, please have a look at our blogpost and the paper. All the models (including intermediate checkpoints) as well training code are released under an Apache 2.0 license.

Controlled Comparison Design

We deliberately trained on the public Nomic-embed data mixture for a strategic reason: Nomic has already trained a dense ModernBERT model (ModernBERT-embed) on this exact data. This lets us compare dense vs. multi-vector training with the same data, same base model (ModernBERT), and same pipeline. The only variable is whether the contrastive phases are performed in the dense or multi-vector setting.

This design reveals a striking result: the dense baseline trained on Nomic data scores 52.89, while the one trained on GTE's proprietary data scores 55.33: a 2.4-point data quality gap. Despite this disadvantage, ColBERT-Zero's full multi-vector pre-training pipeline closes and surpasses this gap, reaching 55.43 nDCG@10.

The Three-Phase Training Pipeline

The development followed a three-phase pipeline, each providing a different type of learning signal:

Phase 1 - Unsupervised Contrastive Pre-training

We began with the nomic-embed-unsupervised-data dataset. Using PyLate's GradCache implementation to scale per-GPU batch size without VRAM constraints, combined with cross-GPU gathering of representations, we reached effective batch sizes of ~16k, required for unsupervised training to produce plausible in-batch hard negatives. Unlike dense training, the multi-vector objective allows the encoder to learn fine-grained token importance from the very first phase.

Phase 2 - Supervised Contrastive Fine-tuning

We refined the model using the nomic-embed-supervised-data. This stage introduced mined hard negatives: documents that are superficially similar to the query but not actually relevant. This allows teaching the model to handle nuance by prioritizing specific keywords and contextual tokens most indicative of a true match.

Phase 3 - Knowledge Distillation (KD)

The final stage used the ms-marco-en-bge dataset. We leveraged a powerful Gemma-based model as a teacher, allowing our student models to learn to replicate complex reasoning scores via the efficient MaxSim operator.

Key Findings

1. The Standard Recipe Leaves Performance on the Table

The KD-only approach (the current industry standard) scores 54.09, lagging behind full pre-training by 1.3 points. A simple distillation step is insufficient for optimal multi-vector performance.

2. Supervised + KD Is the Efficiency Sweet Spot

By running a supervised contrastive step in the multi-vector setting before distillation, we reach 55.12 nDCG@10, closing most of the gap with the fully pre-trained model (55.43). This costs ~40 GH200-hours instead of ~408: roughly 10× cheaper for 99.4% of the performance.

3. Prompt Alignment Is Non-Negotiable

Nomic's base models are pre-trained with asymmetric prompts (search_query: and search_document:). While ColBERT has its own asymmetric mechanism via [Q] and [D] markers, we found:

• Stripping pre-training prompts during fine-tuning causes significant performance degradation.
• Adding prompts to a model not pre-trained with them also hurts performance.
• Even with perfect alignment, prompts provide an intrinsic benefit: full ColBERT pre-training with prompts (55.43) vs. without prompts (54.61), no mismatch in either case, shows a meaningful 0.82-point gap.

Why do prompts help? Our leading hypothesis is that prompt tokens act as implicit query expansion: extra slots that don't carry specific meaning but let the model store global information about the sequence. The original ColBERT used [PAD] tokens for this purpose, but modern Flash Attention implementations broke this trick (masked tokens no longer produce usable embeddings). Explicit prompt tokens may be quietly re-enabling it.

Practical takeaway: Always align your prompts with the base model's pre-training setup. Misalignment is one of the easiest ways to silently lose performance. Note that this sensitivity decreases with stronger downstream fine-tuning: with enough training, the model can adapt to an initial mismatch.

Model Lineup

The Main Models (ColBERT-Zero)

ColBERT-Zero utilizes the full 3-phase pipeline with strict prompt alignment, achieving 55.43 nDCG@10 on BEIR, setting a new SOTA for models <150M parameters. We also provide ColBERT-Zero-noprompts, the same pipeline without asymmetric prompts, to study the impact of query expansion on multi-vector performance.

The cheap-to-train ones (ModernColBERT-embed-base)

These models represent the practical sweet spot. By skipping the expensive unsupervised phase, ModernColBERT-embed-base (Supervised + KD) achieves ~97% of the flagship's performance at only ~10% of the compute cost. For reference, ModernColBERT-embed-base-kd performs only the distillation step on a supervised dense base.

Intermediate Checkpoints

For researchers studying the incremental impact of each phase and prompt alignment, we release several ablation variants: ColBERT-Zero-supervised, ColBERT-Zero-unsupervised (and their -noprompts versions), and ModernColBERT-embed-base-supervised.

Full Performance on BEIR

Model	Avg	FiQA	NFCorpus	TREC-COVID	Touche	ArguAna	Quora	SCIDOCS	SciFact	NQ	ClimateFEVER	HotpotQA	DBPedia	CQADupstack	FEVER	MSMARCO
Baselines
ModernBERT-embed-unsupervised	47.05	42.53	35.33	68.44	18.58	48.82	88.63	19.83	72.30	46.32	22.97	60.00	37.97	42.40	67.39	34.23
ModernBERT-embed-supervised	52.89	40.59	33.40	84.15	31.91	48.96	88.85	18.59	69.63	62.15	35.67	67.11	41.50	42.08	87.35	41.47
GTE-ModernColBERT	54.67	45.28	37.93	83.59	31.23	48.51	86.61	19.06	76.34	61.80	30.62	77.32	48.03	41.00	87.44	45.32
gte-modernbert-base	55.33	48.81	36.44	81.95	21.68	72.68	88.55	21.29	77.40	57.62	37.74	69.47	41.79	42.63	91.03	40.90
KD from dense supervised
ModernColBERT-embed-base-kd-only	54.09	42.51	37.01	79.52	34.58	51.75	87.67	18.15	75.04	61.45	28.31	76.70	47.54	40.68	84.82	45.57
Supervised + KD from dense unsupervised
ModernColBERT-embed-base-supervised	50.72	40.09	35.56	71.12	25.53	44.27	86.96	18.19	73.78	58.89	32.95	71.49	43.23	42.55	70.51	45.72
ModernColBERT-embed-base	55.12	41.50	36.51	77.46	33.77	52.45	86.26	18.66	74.90	62.24	37.27	80.07	48.27	41.60	89.71	46.17
ColBERT-Zero
Unsupervised	51.44	45.38	36.88	67.82	22.59	51.53	87.78	22.30	76.76	58.80	24.24	68.29	43.16	45.76	81.58	38.78
Supervised	51.81	42.45	35.60	74.72	23.83	41.81	87.19	19.85	73.71	61.95	35.01	71.37	46.20	45.16	72.61	45.68
Distilled	55.43	42.62	37.28	78.69	36.13	53.07	85.24	19.88	76.50	61.66	35.72	79.41	47.48	41.34	90.59	45.80
ColBERT-Zero-noprompts
Unsupervised	51.70	45.31	34.72	73.55	23.26	52.56	88.15	22.63	76.10	59.18	24.24	66.66	42.61	45.56	81.88	39.15
Supervised	52.39	43.36	36.01	72.42	23.79	47.42	87.79	21.30	73.85	62.25	31.61	70.32	44.07	44.03	85.54	42.11
Distilled	54.61	43.14	36.60	78.60	36.36	49.49	88.05	19.13	76.42	61.73	32.70	76.99	47.69	40.21	85.97	46.01

Limitations & Discussion

• Data-specific findings. We deliberately used the Nomic Embed data mixture for controlled comparison. Some observations (particularly around prompt sensitivity) may not generalize to different or stronger training configurations.
• Scale vs. objective. The gains from multi-vector pre-training likely reflect more training time in the multi-vector setting, rather than the contrastive objective itself. Performing KD alone at a larger scale might yield similar or superior results due to the higher quality of the distillation signal. Our study uses the conventional setup where training scale is inversely proportional to signal quality, reflecting the higher cost of generating high-quality labels.
• Prompt sensitivity decreases with stronger fine-tuning. When experimenting with stronger fine-tuning data (e.g., NV-Retriever), adding prompts on top of a model pre-trained without them did not degrade results the way it did with ColBERT-Zero. With enough downstream training, the model can adapt to an initial mismatch.

Serving at Scale

For production deployment of ColBERT-Zero and other multi-vector models, check out NextPlaid and FastPlaid, our production-grade engines for multi-vector retrieval.

Resources

• 📦 All checkpoints: HF Collection - every phase, with and without prompts
• 💻 Code: Training boilerplates
• 📄 Paper: ArXiv

Model Details

Model Description

• Model Type: PyLate model
• Document Length: 519 tokens
• Query Length: 39 tokens
• Output Dimensionality: 128 tokens
• Similarity Function: MaxSim
• Training Dataset:
  • train

Model Sources

• Documentation: PyLate Documentation
• Repository: PyLate on GitHub
• Hugging Face: PyLate models on Hugging Face

Full Model Architecture

ColBERT(
  (0): Transformer({'max_seq_length': 518, 'do_lower_case': False, 'architecture': 'ModernBertModel'})
  (1): Dense({'in_features': 768, 'out_features': 128, 'bias': False, 'activation_function': 'torch.nn.modules.linear.Identity', 'use_residual': False})
)

Usage

First install the PyLate library:

pip install -U pylate

Retrieval

Use this model with PyLate to index and retrieve documents. The index uses FastPLAID for efficient similarity search.

Indexing documents

Load the ColBERT model and initialize the PLAID index, then encode and index your documents:

from pylate import indexes, models, retrieve

# Step 1: Load the ColBERT model
model = models.ColBERT(
    model_name_or_path="pylate_model_id",
)

# Step 2: Initialize the PLAID index
index = indexes.PLAID(
    index_folder="pylate-index",
    index_name="index",
    override=True,  # This overwrites the existing index if any
)

# Step 3: Encode the documents
documents_ids = ["1", "2", "3"]
documents = ["document 1 text", "document 2 text", "document 3 text"]

documents_embeddings = model.encode(
    documents,
    batch_size=32,
    is_query=False,  # Ensure that it is set to False to indicate that these are documents, not queries
    show_progress_bar=True,
)

# Step 4: Add document embeddings to the index by providing embeddings and corresponding ids
index.add_documents(
    documents_ids=documents_ids,
    documents_embeddings=documents_embeddings,
)

Note that you do not have to recreate the index and encode the documents every time. Once you have created an index and added the documents, you can re-use the index later by loading it:

# To load an index, simply instantiate it with the correct folder/name and without overriding it
index = indexes.PLAID(
    index_folder="pylate-index",
    index_name="index",
)

Retrieving top-k documents for queries

Once the documents are indexed, you can retrieve the top-k most relevant documents for a given set of queries. To do so, initialize the ColBERT retriever with the index you want to search in, encode the queries and then retrieve the top-k documents to get the top matches ids and relevance scores:

# Step 1: Initialize the ColBERT retriever
retriever = retrieve.ColBERT(index=index)

# Step 2: Encode the queries
queries_embeddings = model.encode(
    ["query for document 3", "query for document 1"],
    batch_size=32,
    is_query=True,  #  # Ensure that it is set to False to indicate that these are queries
    show_progress_bar=True,
)

# Step 3: Retrieve top-k documents
scores = retriever.retrieve(
    queries_embeddings=queries_embeddings,
    k=10,  # Retrieve the top 10 matches for each query
)

Reranking

If you only want to use the ColBERT model to perform reranking on top of your first-stage retrieval pipeline without building an index, you can simply use rank function and pass the queries and documents to rerank:

from pylate import rank, models

queries = [
    "query A",
    "query B",
]

documents = [
    ["document A", "document B"],
    ["document 1", "document C", "document B"],
]

documents_ids = [
    [1, 2],
    [1, 3, 2],
]

model = models.ColBERT(
    model_name_or_path="pylate_model_id",
)

queries_embeddings = model.encode(
    queries,
    is_query=True,
)

documents_embeddings = model.encode(
    documents,
    is_query=False,
)

reranked_documents = rank.rerank(
    documents_ids=documents_ids,
    queries_embeddings=queries_embeddings,
    documents_embeddings=documents_embeddings,
)

Evaluation

Metrics

Py Late Information Retrieval

• Dataset: ['NanoClimateFEVER', 'NanoDBPedia', 'NanoFEVER', 'NanoFiQA2018', 'NanoHotpotQA', 'NanoMSMARCO', 'NanoNFCorpus', 'NanoNQ', 'NanoQuoraRetrieval', 'NanoSCIDOCS', 'NanoArguAna', 'NanoSciFact', 'NanoTouche2020']
• Evaluated with pylate.evaluation.pylate_information_retrieval_evaluator.PyLateInformationRetrievalEvaluator

Metric	NanoClimateFEVER	NanoDBPedia	NanoFEVER	NanoFiQA2018	NanoHotpotQA	NanoMSMARCO	NanoNFCorpus	NanoNQ	NanoQuoraRetrieval	NanoSCIDOCS	NanoArguAna	NanoSciFact	NanoTouche2020
MaxSim_accuracy@1	0.36	0.86	0.96	0.58	0.98	0.6	0.58	0.62	0.92	0.48	0.24	0.7	0.8163
MaxSim_accuracy@3	0.68	0.94	1.0	0.66	1.0	0.68	0.68	0.84	0.98	0.74	0.64	0.82	0.9796
MaxSim_accuracy@5	0.76	0.94	1.0	0.72	1.0	0.78	0.72	0.88	1.0	0.76	0.7	0.88	0.9796
MaxSim_accuracy@10	0.88	0.98	1.0	0.82	1.0	0.9	0.76	0.9	1.0	0.9	0.9	0.92	0.9796
MaxSim_precision@1	0.36	0.86	0.96	0.58	0.98	0.6	0.58	0.62	0.92	0.48	0.24	0.7	0.8163
MaxSim_precision@3	0.2867	0.7333	0.3533	0.3267	0.6	0.2267	0.4267	0.28	0.3933	0.4067	0.2133	0.2867	0.7279
MaxSim_precision@5	0.22	0.66	0.212	0.248	0.368	0.156	0.396	0.176	0.248	0.304	0.14	0.196	0.6653
MaxSim_precision@10	0.148	0.584	0.11	0.148	0.186	0.09	0.316	0.096	0.128	0.204	0.09	0.102	0.5388
MaxSim_recall@1	0.18	0.108	0.8967	0.3526	0.49	0.6	0.066	0.59	0.7973	0.1027	0.24	0.675	0.0564
MaxSim_recall@3	0.36	0.2161	0.9633	0.4742	0.9	0.68	0.1036	0.78	0.932	0.2507	0.64	0.79	0.1493
MaxSim_recall@5	0.429	0.2933	0.9633	0.546	0.92	0.78	0.1297	0.81	0.9627	0.3107	0.7	0.87	0.2241
MaxSim_recall@10	0.5537	0.4273	0.98	0.6425	0.93	0.9	0.1635	0.86	0.9727	0.4167	0.9	0.91	0.3475
MaxSim_ndcg@10	0.4511	0.7326	0.9624	0.5786	0.9243	0.7242	0.4055	0.7475	0.9376	0.4124	0.562	0.802	0.6176
MaxSim_mrr@10	0.5353	0.8995	0.9767	0.6434	0.99	0.671	0.6304	0.7342	0.954	0.6184	0.4557	0.7717	0.8776
MaxSim_map@100	0.3571	0.5806	0.9478	0.5234	0.8945	0.6766	0.1959	0.7036	0.9156	0.3294	0.4584	0.7652	0.4571

Nano BEIR

• Dataset: NanoBEIR_mean
• Evaluated with pylate.evaluation.nano_beir_evaluator.NanoBEIREvaluator

Metric	Value
MaxSim_accuracy@1	0.6689
MaxSim_accuracy@3	0.8184
MaxSim_accuracy@5	0.8554
MaxSim_accuracy@10	0.9184
MaxSim_precision@1	0.6689
MaxSim_precision@3	0.4047
MaxSim_precision@5	0.3069
MaxSim_precision@10	0.2108
MaxSim_recall@1	0.3965
MaxSim_recall@3	0.5569
MaxSim_recall@5	0.6107
MaxSim_recall@10	0.6926
MaxSim_ndcg@10	0.6814
MaxSim_mrr@10	0.7506
MaxSim_map@100	0.6004

Training Details

Training Dataset

train

• Dataset: train
• Size: 640,000 training samples
• Columns: query_id, document_ids, and scores
• Approximate statistics based on the first 1000 samples:

  	query_id	document_ids	scores
  type	int	list	list
  details	836: ~0.10% 3582: ~0.10% ...	size: 32 elements	size: 32 elements

• Samples:

  query_id	document_ids	scores
  685613	[7546874, 1176459, 197677, 2306318, 8541504, ...]	[0.9999999992804947, 0.24845418756716053, 0.7594154013647826, 0.26644182105618575, 0.390668914839766, ...]
  237784	[6366584, 4034101, 2325374, 6914618, 6042146, ...]	[0.9999999991784339, 0.42233632827946693, 0.5956354295491569, 0.12644415907455164, 0.6636713730105909, ...]
  904294	[448408, 8743975, 49600, 7339401, 2714261, ...]	[0.9999999991841937, 0.877629062381539, 0.8330146583389045, 0.3116634796692611, 0.4633524534142185, ...]

• Loss: pylate.losses.distillation.Distillation

Training Hyperparameters

Non-Default Hyperparameters

• eval_strategy: steps
• per_device_train_batch_size: 4
• per_device_eval_batch_size: 4
• gradient_accumulation_steps: 2
• learning_rate: 1e-05
• num_train_epochs: 1.0
• bf16: True
• dataloader_num_workers: 4
• ddp_find_unused_parameters: False

All Hyperparameters

Click to expand

• overwrite_output_dir: False
• do_predict: False
• eval_strategy: steps
• prediction_loss_only: True
• per_device_train_batch_size: 4
• per_device_eval_batch_size: 4
• per_gpu_train_batch_size: None
• per_gpu_eval_batch_size: None
• gradient_accumulation_steps: 2
• eval_accumulation_steps: None
• torch_empty_cache_steps: None
• learning_rate: 1e-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: 1.0
• 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: True
• fp16: False
• fp16_opt_level: O1
• half_precision_backend: auto
• bf16_full_eval: False
• fp16_full_eval: False
• tf32: None
• local_rank: 3
• ddp_backend: None
• tpu_num_cores: None
• tpu_metrics_debug: False
• debug: []
• dataloader_drop_last: True
• dataloader_num_workers: 4
• 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}
• 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: False
• 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: {}

Training Logs

Click to expand

Epoch	Step	Training Loss	NanoClimateFEVER_MaxSim_ndcg@10	NanoDBPedia_MaxSim_ndcg@10	NanoFEVER_MaxSim_ndcg@10	NanoFiQA2018_MaxSim_ndcg@10	NanoHotpotQA_MaxSim_ndcg@10	NanoMSMARCO_MaxSim_ndcg@10	NanoNFCorpus_MaxSim_ndcg@10	NanoNQ_MaxSim_ndcg@10	NanoQuoraRetrieval_MaxSim_ndcg@10	NanoSCIDOCS_MaxSim_ndcg@10	NanoArguAna_MaxSim_ndcg@10	NanoSciFact_MaxSim_ndcg@10	NanoTouche2020_MaxSim_ndcg@10	NanoBEIR_mean_MaxSim_ndcg@10
0.0025	50	0.0187	-	-	-	-	-	-	-	-	-	-	-	-	-	-
0.0275	550	0.0155	-	-	-	-	-	-	-	-	-	-	-	-	-	-
0.0525	1050	0.0146	-	-	-	-	-	-	-	-	-	-	-	-	-	-
0.075	1500	0.0141	0.4530	0.7263	0.9670	0.5786	0.9313	0.7349	0.3994	0.7587	0.9506	0.4292	0.5152	0.8059	0.6139	0.6818
0.0775	1550	0.0139	-	-	-	-	-	-	-	-	-	-	-	-	-	-
0.1025	2050	0.0138	-	-	-	-	-	-	-	-	-	-	-	-	-	-
0.1275	2550	0.0132	-	-	-	-	-	-	-	-	-	-	-	-	-	-
0.15	3000	0.0132	0.4562	0.7260	0.9738	0.5756	0.9221	0.7378	0.4021	0.7555	0.9473	0.4276	0.5376	0.8082	0.6206	0.6839
0.1525	3050	0.013	-	-	-	-	-	-	-	-	-	-	-	-	-	-
0.1775	3550	0.0129	-	-	-	-	-	-	-	-	-	-	-	-	-	-
0.2025	4050	0.0129	-	-	-	-	-	-	-	-	-	-	-	-	-	-
0.225	4500	0.0126	0.4551	0.7381	0.9624	0.5890	0.9238	0.7381	0.3978	0.7522	0.9400	0.4206	0.5455	0.8141	0.6184	0.6842
0.2275	4550	0.0124	-	-	-	-	-	-	-	-	-	-	-	-	-	-
0.2525	5050	0.0126	-	-	-	-	-	-	-	-	-	-	-	-	-	-
0.2775	5550	0.0123	-	-	-	-	-	-	-	-	-	-	-	-	-	-
0.3	6000	0.012	0.4474	0.7375	0.9635	0.5908	0.9282	0.7416	0.4064	0.7551	0.9424	0.4198	0.5592	0.8074	0.6191	0.6860
0.3025	6050	0.0125	-	-	-	-	-	-	-	-	-	-	-	-	-	-
0.3275	6550	0.012	-	-	-	-	-	-	-	-	-	-	-	-	-	-
0.3525	7050	0.0122	-	-	-	-	-	-	-	-	-	-	-	-	-	-
0.375	7500	0.0123	0.4534	0.7266	0.9631	0.5875	0.9294	0.7349	0.4012	0.7459	0.9417	0.4195	0.5608	0.8060	0.6205	0.6839
0.3775	7550	0.0118	-	-	-	-	-	-	-	-	-	-	-	-	-	-
0.4025	8050	0.0118	-	-	-	-	-	-	-	-	-	-	-	-	-	-
0.4275	8550	0.0119	-	-	-	-	-	-	-	-	-	-	-	-	-	-
0.45	9000	0.0114	0.4537	0.7219	0.9631	0.5837	0.9290	0.7374	0.4032	0.7522	0.9496	0.4134	0.5572	0.8113	0.6190	0.6842
0.4525	9050	0.0117	-	-	-	-	-	-	-	-	-	-	-	-	-	-
0.4775	9550	0.0119	-	-	-	-	-	-	-	-	-	-	-	-	-	-
0.5025	10050	0.0112	-	-	-	-	-	-	-	-	-	-	-	-	-	-
0.525	10500	0.0117	0.4541	0.7325	0.9653	0.5803	0.9243	0.7357	0.4092	0.7566	0.9468	0.4169	0.5596	0.8040	0.6177	0.6849
0.5275	10550	0.0116	-	-	-	-	-	-	-	-	-	-	-	-	-	-
0.5525	11050	0.0115	-	-	-	-	-	-	-	-	-	-	-	-	-	-
0.5775	11550	0.0112	-	-	-	-	-	-	-	-	-	-	-	-	-	-
0.6	12000	0.0112	0.4606	0.7310	0.9624	0.5862	0.9243	0.7341	0.4085	0.7523	0.9463	0.4192	0.5708	0.8086	0.6201	0.6865
0.6025	12050	0.0116	-	-	-	-	-	-	-	-	-	-	-	-	-	-
0.6275	12550	0.0113	-	-	-	-	-	-	-	-	-	-	-	-	-	-
0.6525	13050	0.0115	-	-	-	-	-	-	-	-	-	-	-	-	-	-
0.675	13500	0.0111	0.4505	0.7294	0.9653	0.5796	0.9289	0.7348	0.4063	0.7553	0.9451	0.4205	0.5627	0.8034	0.6173	0.6845
0.6775	13550	0.0112	-	-	-	-	-	-	-	-	-	-	-	-	-	-
0.7025	14050	0.0112	-	-	-	-	-	-	-	-	-	-	-	-	-	-
0.7275	14550	0.0109	-	-	-	-	-	-	-	-	-	-	-	-	-	-
0.75	15000	0.0113	0.4544	0.7281	0.9624	0.5785	0.9227	0.7241	0.4081	0.7495	0.9391	0.4158	0.5639	0.8020	0.6195	0.6822
0.7525	15050	0.0112	-	-	-	-	-	-	-	-	-	-	-	-	-	-
0.7775	15550	0.011	-	-	-	-	-	-	-	-	-	-	-	-	-	-
0.8025	16050	0.0106	-	-	-	-	-	-	-	-	-	-	-	-	-	-
0.825	16500	0.0113	0.4520	0.7354	0.9624	0.5784	0.9279	0.7340	0.4042	0.7505	0.9388	0.4117	0.5630	0.8020	0.6204	0.6831
0.8275	16550	0.0107	-	-	-	-	-	-	-	-	-	-	-	-	-	-
0.8525	17050	0.0109	-	-	-	-	-	-	-	-	-	-	-	-	-	-
0.8775	17550	0.011	-	-	-	-	-	-	-	-	-	-	-	-	-	-
0.9	18000	0.0109	0.4548	0.7336	0.9624	0.5791	0.9243	0.7313	0.4067	0.7475	0.9376	0.4132	0.5625	0.8094	0.6214	0.6834
0.9025	18050	0.011	-	-	-	-	-	-	-	-	-	-	-	-	-	-
0.9275	18550	0.0109	-	-	-	-	-	-	-	-	-	-	-	-	-	-
0.9525	19050	0.0107	-	-	-	-	-	-	-	-	-	-	-	-	-	-
0.975	19500	0.0111	0.4511	0.7326	0.9624	0.5786	0.9243	0.7242	0.4055	0.7475	0.9376	0.4124	0.5620	0.8020	0.6176	0.6814
0.9775	19550	0.0112	-	-	-	-	-	-	-	-	-	-	-	-	-	-

Framework Versions

• Python: 3.13.0
• Sentence Transformers: 5.1.1
• PyLate: 1.3.4
• Transformers: 4.48.3
• PyTorch: 2.6.0
• Accelerate: 1.12.0
• Datasets: 4.4.1
• Tokenizers: 0.21.0

Citation

BibTeX

ColBERT-Zero

@misc{chaffin2026colbertzeropretrainpretraincolbert,
  title         = {ColBERT-Zero: To Pre-train Or Not To Pre-train ColBERT models}, 
  author        = {Antoine Chaffin and Luca Arnaboldi and Amélie Chatelain and Florent Krzakala},
  year          = {2026},
  eprint        = {2602.16609},
  archivePrefix = {arXiv},
  primaryClass  = {cs.CL},
  url           = {https://arxiv.org/abs/2602.16609}, 
}

Sentence Transformers

@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"
}

PyLate

@inproceedings{DBLP:conf/cikm/ChaffinS25,
  author       = {Antoine Chaffin and
                  Rapha{"{e}}l Sourty},
  editor       = {Meeyoung Cha and
                  Chanyoung Park and
                  Noseong Park and
                  Carl Yang and
                  Senjuti Basu Roy and
                  Jessie Li and
                  Jaap Kamps and
                  Kijung Shin and
                  Bryan Hooi and
                  Lifang He},
  title        = {PyLate: Flexible Training and Retrieval for Late Interaction Models},
  booktitle    = {Proceedings of the 34th {ACM} International Conference on Information
                  and Knowledge Management, {CIKM} 2025, Seoul, Republic of Korea, November
                  10-14, 2025},
  pages        = {6334--6339},
  publisher    = {{ACM}},
  year         = {2025},
  url          = {https://github.com/lightonai/pylate},
  doi          = {10.1145/3746252.3761608},
}

Nomic Embed

@article{DBLP:journals/tmlr/NussbaumMMD25,
  author       = {Zach Nussbaum and
                  John Xavier Morris and
                  Andriy Mulyar and
                  Brandon Duderstadt},
  title        = {Nomic Embed: Training a Reproducible Long Context Text Embedder},
  journal      = {Trans. Mach. Learn. Res.},
  volume       = {2025},
  year         = {2025},
  url          = {https://openreview.net/forum?id=IPmzyQSiQE},
  timestamp    = {Fri, 20 Jun 2025 14:19:48 +0200},
  biburl       = {https://dblp.org/rec/journals/tmlr/NussbaumMMD25.bib},
  bibsource    = {dblp computer science bibliography, https://dblp.org}
}