NVIDIA-Merlin/Transformers4Rec

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Transformers4Rec is a flexible and efficient library for sequential and session-based recommendation and works with PyTorch.

Stars: 1.3k
Forks: 165
Open beginner issues: 5
Indexed issues: 97
Avg merge: 1m
Merged PRs (30d): 2

Dominant language: Python
License: Apache-2.0
Last GitHub push: Aug 23, 2026
Latest indexed: Sep 19, 2026
Contributing guide: Contributing guide
Code of conduct: No code of conduct
Beginner labels: good first issue

Beginner friendly Everything

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97 open issues indexed

📋 Documentation Enhancement Suggestion Open

Difficulty 2/5 1-3 hours Newbie friendliness 35/100

NVIDIA-Merlin/Transformers4Rec#820 · Opened May 13, 2026
[SECURITY] `torch.load()` called without `weights_only=True` under `torch>=1.0` pin Open

Difficulty 4/5 3-5 days Newbie friendliness 68/100

NVIDIA-Merlin/Transformers4Rec#815 · Opened Apr 17, 2026
[SECURITY] Pickle allowlist in `utils/serialization.py` is bypassable (`builtins.getattr` allowed, duplicate keys drop `PredictionTask`) Open

Difficulty 4/5 3-5 days Newbie friendliness 45/100

NVIDIA-Merlin/Transformers4Rec#814 · Opened Apr 17, 2026
[BUG] `Head._task_weights = defaultdict()` silently behaves like a plain dict Open

Difficulty 1/5 Under an hour Newbie friendliness 74/100

NVIDIA-Merlin/Transformers4Rec#813 · Opened Apr 17, 2026
[BUG] `MerlinDataLoader._augment_schema` raises TypeError when `lists` is omitted Open

Difficulty 1/5 Under an hour Newbie friendliness 88/100

NVIDIA-Merlin/Transformers4Rec#812 · Opened Apr 17, 2026
[BUG] `Head.build` raises `TypeError: 'NoneType' object is not callable` when body lacks `output_size` Open

Difficulty 2/5 1-3 hours Newbie friendliness 76/100

NVIDIA-Merlin/Transformers4Rec#811 · Opened Apr 17, 2026
[BUG] `Model.load` raises TypeError on Python 3.9+ (parameterized generic in isinstance) Open

Difficulty 2/5 1-3 hours Newbie friendliness 78/100

NVIDIA-Merlin/Transformers4Rec#810 · Opened Apr 17, 2026
[BUG] `load_model_trainer_states_from_checkpoint()` function is broken Open

bug status/needs-triage

Difficulty 2/5 1-3 hours Newbie friendliness 74/100

NVIDIA-Merlin/Transformers4Rec#806 · 1 comment · Opened Jan 18, 2026
[ALERT] Access to NVIDIA's Self-Hosted Runners is Expiring Open

nvidia-runners

Difficulty 1/5 Under an hour Newbie friendliness 20/100

NVIDIA-Merlin/Transformers4Rec#798 · Opened Feb 3, 2025
[BUG] Pre-trained embeddings fails using variable input sequence lengths Open

bug status/needs-triage

Difficulty 4/5 3-5 days Newbie friendliness 25/100

NVIDIA-Merlin/Transformers4Rec#797 · 1 comment · Opened Jan 10, 2025
[DOC] Pre-trained Embeddings Usage Open

status/needs-triage

Difficulty 4/5 3-5 days Newbie friendliness 35/100

NVIDIA-Merlin/Transformers4Rec#796 · Opened Jan 9, 2025
[BUG] Trainer have no attribute 'use_cuda_amp' Open

bug status/needs-triage

Difficulty 3/5 1-2 days Newbie friendliness 58/100

NVIDIA-Merlin/Transformers4Rec#795 · 1 comment · Opened Dec 27, 2024
[QST] Categorifying nested lists in NVTabular and transformers4rec Open

status/needs-triage

Difficulty 5/5 Over a week Newbie friendliness 25/100

NVIDIA-Merlin/Transformers4Rec#792 · Opened Oct 28, 2024
[QST]Error installing transformers4rec: Failed building wheel for tokenizers Open

status/needs-triage

Difficulty 4/5 3-5 days Newbie friendliness 25/100

NVIDIA-Merlin/Transformers4Rec#791 · 1 comment · Opened Oct 22, 2024
[BUG] save_time_based_splits function does not support CPU mode well Open

bug status/needs-triage

Difficulty 3/5 1-2 days Newbie friendliness 45/100

NVIDIA-Merlin/Transformers4Rec#789 · Opened Sep 23, 2024
Training Not Completing in 03-Session-based-Yoochoose-multigpu-training-PyT.ipynb with Multiple GPUs Open

bug status/needs-triage

Difficulty 4/5 3-5 days Newbie friendliness 35/100

NVIDIA-Merlin/Transformers4Rec#787 · Opened Sep 10, 2024
[DOC] Text Input Feature Empty Open

status/needs-triage

Difficulty 5/5 Over a week Newbie friendliness 20/100

NVIDIA-Merlin/Transformers4Rec#784 · Opened Jul 22, 2024
[BUG] A bug while fine-tuning the model by iteratively training and evaluating using a sliding time window Open

bug status/needs-triage

Difficulty 4/5 3-5 days Newbie friendliness 32/100

NVIDIA-Merlin/Transformers4Rec#783 · 3 comments · Opened Jul 17, 2024
[QST] Help with end-to-end example of yoochoose Open

status/needs-triage

Difficulty 4/5 3-5 days Newbie friendliness 25/100

NVIDIA-Merlin/Transformers4Rec#782 · Opened Jul 16, 2024
Compound Tags.ITEM_ID Open

Difficulty 2/5 1-3 hours Newbie friendliness 45/100

NVIDIA-Merlin/Transformers4Rec#781 · Opened May 23, 2024
[BUG] examples/tutorial/01-preprocess.ipynb: Convert timestamp from datetime - NotImplementedError: cuDF does not yet support timezone-aware datetimes Open

bug status/needs-triage

Difficulty 2/5 1-3 hours Newbie friendliness 58/100

NVIDIA-Merlin/Transformers4Rec#777 · Opened Apr 25, 2024
[QST] examples/tutorial/02-ETL-with-NVTabular.ipynb Open

status/needs-triage

Difficulty 3/5 1-2 days Newbie friendliness 25/100

NVIDIA-Merlin/Transformers4Rec#776 · Opened Apr 25, 2024
[BUG] RuntimeError: PyTorch execute failure: Expected Tensor but got GenericList Open

bug status/needs-triage

Difficulty 4/5 3-5 days Newbie friendliness 35/100

NVIDIA-Merlin/Transformers4Rec#771 · Opened Mar 19, 2024
Model is not generating accurate recommandations [QST] Open

status/needs-triage

Difficulty 5/5 Over a week Newbie friendliness 15/100

NVIDIA-Merlin/Transformers4Rec#770 · 1 comment · Opened Feb 1, 2024
[QST] Extracting User Representation Vectors from Pre-trained Next Item Prediction Model Open

status/needs-triage

Difficulty 4/5 3-5 days Newbie friendliness 25/100

NVIDIA-Merlin/Transformers4Rec#766 · 1 reaction · Opened Jan 7, 2024
[BUG] CausalLanguageModeling do not mask last input item Open

bug status/needs-triage

Difficulty 2/5 1-3 hours Newbie friendliness 45/100

NVIDIA-Merlin/Transformers4Rec#765 · 3 comments · Opened Jan 5, 2024
[FEA] Post context fusion using T4rec api Open

status/needs-triage

Difficulty 5/5 Over a week Newbie friendliness 20/100

NVIDIA-Merlin/Transformers4Rec#764 · 2 comments · Opened Jan 5, 2024
[QST] Help with creating two tower model with transformers. Open

status/needs-triage

Difficulty 5/5 Over a week Newbie friendliness 15/100

NVIDIA-Merlin/Transformers4Rec#763 · 1 comment · Opened Jan 5, 2024
[BUG] Inconsistent inference and evaluation results of the XLNET-CLM even on the training set! Open

bug status/needs-triage

Difficulty 4/5 3-5 days Newbie friendliness 35/100

NVIDIA-Merlin/Transformers4Rec#761 · 2 comments · Opened Nov 25, 2023
Génerating predictions Open

status/needs-triage

Difficulty 4/5 3-5 days Newbie friendliness 25/100

NVIDIA-Merlin/Transformers4Rec#759 · 5 comments · Opened Nov 13, 2023
RuntimeError: CUDF failure at: /__w/cudf/cudf/cpp/src/io/parquet/reader_impl_helpers.cpp:379: Invalid rowgroup index[BUG] Open

bug status/needs-triage

Difficulty 4/5 3-5 days Newbie friendliness 25/100

NVIDIA-Merlin/Transformers4Rec#756 · 10 comments · Opened Nov 3, 2023
[QST] How to print metrics while training? Open

status/needs-triage

Difficulty 3/5 1-2 days Newbie friendliness 35/100

NVIDIA-Merlin/Transformers4Rec#754 · Opened Oct 22, 2023
[QST] Cross-entropy and pairwise losses are supported in Next Item Prediction Open

status/needs-triage

Difficulty 3/5 1-2 days Newbie friendliness 25/100

NVIDIA-Merlin/Transformers4Rec#751 · Opened Oct 16, 2023
[BUG] Incorrect scores for evaluation Open

bug status/needs-triage

Difficulty 4/5 3-5 days Newbie friendliness 35/100

NVIDIA-Merlin/Transformers4Rec#746 · Opened Sep 20, 2023
[FEA] Feature to extract attention values from transformer heads Open

status/needs-triage

Difficulty 5/5 Over a week Newbie friendliness 25/100

NVIDIA-Merlin/Transformers4Rec#745 · Opened Sep 20, 2023
PicklingError Open

Difficulty 4/5 3-5 days Newbie friendliness 42/100

NVIDIA-Merlin/Transformers4Rec#740 · 8 comments · Opened Aug 9, 2023
Users' Long term and short term interests Open

status/needs-triage

Difficulty 5/5 Over a week Newbie friendliness 20/100

NVIDIA-Merlin/Transformers4Rec#730 · 7 comments · Opened Jul 2, 2023
[BUG] `cannot pickle 'mappingproxy' object` when using `TabularFeatures` `create_categorical` Open

bug status/needs-triage

Difficulty 3/5 1-2 days Newbie friendliness 42/100

NVIDIA-Merlin/Transformers4Rec#727 · 4 comments · Opened Jun 27, 2023
[QST] Training model on custom data gets stuck near the end Open

bug P1

Difficulty 4/5 3-5 days Newbie friendliness 25/100

NVIDIA-Merlin/Transformers4Rec#726 · 11 comments · Opened Jun 26, 2023
Dual Transformer for long term and short term seq[QST] Open

status/needs-triage

Difficulty 5/5 Over a week Newbie friendliness 20/100

NVIDIA-Merlin/Transformers4Rec#725 · 10 comments · Opened Jun 25, 2023
[QST] Target feature for causal masking Open

question status/needs-triage

Difficulty 4/5 3-5 days Newbie friendliness 20/100

NVIDIA-Merlin/Transformers4Rec#722 · 3 comments · Opened Jun 16, 2023
[BUG] XLNET-CLM eval recall metric value does not match with custom np based recall metric value Open

bug P1

NVIDIA-Merlin/Transformers4Rec#719 · 6 comments · 2 assignees · Opened Jun 12, 2023
[FEA] Support for incorporating negative signals, i.e. song skipped by a user Open

enhancement status/needs-triage

NVIDIA-Merlin/Transformers4Rec#702 · 2 comments · 1 assignee · Opened May 16, 2023
Loss Increasing after few epochs Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

NVIDIA-Merlin/Transformers4Rec#652 · 6 comments · Opened Mar 20, 2023
[QST]Transformers4Rec/examples/tutorial/03-Session-based-recsys.ipynb. Open

status/needs-triage

Difficulty 4/5 3-5 days Newbie friendliness 30/100

NVIDIA-Merlin/Transformers4Rec#639 · 18 comments · Opened Mar 10, 2023
0.1.16 version creates import errors Open

P1 question

Difficulty 4/5 3-5 days Newbie friendliness 35/100

NVIDIA-Merlin/Transformers4Rec#629 · 11 comments · Opened Mar 2, 2023
[FEA] Update Transformers4Rec to use latest release of HF transformers Open

area/transformers enhancement

Difficulty 4/5 3-5 days Newbie friendliness 35/100

NVIDIA-Merlin/Transformers4Rec#568 · 1 comment · Opened Dec 7, 2022
[Task] Add all notebooks for unittests Open

examples

NVIDIA-Merlin/Transformers4Rec#561 · 3 comments · 1 assignee · Opened Dec 5, 2022
[DOC] Missing detail in pip install instructions Open

status/needs-triage

NVIDIA-Merlin/Transformers4Rec#560 · 3 comments · 1 assignee · Opened Dec 5, 2022
[QST] How to use session-level (single) and item-level (sequence) features together in next item prediction task? Open

question

Difficulty 5/5 Over a week Newbie friendliness 25/100

NVIDIA-Merlin/Transformers4Rec#556 · 3 comments · Opened Nov 30, 2022

NVIDIA-Merlin/Transformers4Rec

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