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Open-weight model · Robotics

b1k-2026-task20-ft1

by Rena Tian Rena-Tian/b1k-2026-task20-ft1

b1k-2026-task20-ft1 is an open-weight model for robotics from Rena Tian, released under Apache License 2.0. Its published files total 12.6 GB.

Selected checkpoint for the BEHAVIOR-1K 2026 submission. (IliaLarchenko/behavior-1k-solution, ~3B params, task-ID embeddings, no language prompt). - Checkpoint is params-only (no optimizer state): it can be served or used as an init, not --resumed.

Parameters—
Context—
Weights12.6 GB
Licenseapache-2.0
AccessOpen weights
Monthly Downloads—

Model Card

By Rena Tian, published under apache-2.0, revision 1290edcee49a.

Selected checkpoint for the BEHAVIOR-1K 2026 submission. (IliaLarchenko/behavior-1k-solution, ~3B params, task-ID embeddings, no language prompt). - Checkpoint is params-only (no optimizer state): it can be served or used as an init, not --resumed. - params/ — orbax/ocdbt parameters - assets/b1k2026task20/normstats.json — normalization stats - CHECKPOINTMETADATA Serve with scripts/serveb1k.py --task-id 20 policy:checkpoint --policy.config pibehaviorb1k2026task20 --policy.dir. Scored the 2026 leaderboard way: public instances 0-9 (ids 301-310), one rollout each, default 1.5x timeouts, task score = sum / 10. - Checkpoint choice, screened on held-out instances 311-315 (mean q): step 8000 =…

Read Rena Tian's full model card

BEHAVIOR Challenge 2026 — task 20 (sorting_vegetables), fine-tune ft1, step 9999

Selected checkpoint for the BEHAVIOR-1K 2026 submission.

Model

  • Architecture: the 2025 BEHAVIOR Challenge winner's pi0.5-based policy (IliaLarchenko/behavior-1k-solution, ~3B params, task-ID embeddings, no language prompt).
  • Init: the winner's task-specific checkpoint_2 (50 task slots).
  • Training config: pi_behavior_b1k_2026_task20 (in our pipeline repo's behavior-1k-solution/src/b1k/training/config.py).
  • Data: 2026 challenge demos, task 20 episodes 4000-4179 (last 20 held out), RGB cameras only.
  • Recipe: 10,000 steps (final step is 9999), batch 16, peak lr 5e-5, 1x A100 80GB. Final training loss 0.295. W&B run 599dnmgc.
  • Checkpoint is params-only (no optimizer state): it can be served or used as an init, not --resumed.

Layout

  • params/ — orbax/ocdbt parameters
  • assets/b1k_2026_task20/norm_stats.json — normalization stats
  • _CHECKPOINT_METADATA

Serve with scripts/serve_b1k.py --task-id 20 policy:checkpoint --policy.config pi_behavior_b1k_2026_task20 --policy.dir <this dir>.

Evaluation (local; q = fraction of goal predicates newly satisfied)

Scored the 2026 leaderboard way: public instances 0-9 (ids 301-310), one rollout each, default 1.5x timeouts, task score = sum / 10.

Task 20 (13 goal predicates)

Leaderboard score: q = 0.1846 (sum 1.85 over 301-310; full completions: none)

instance 301 302 303 304 305 306 307 308 309 310
q 0.154 0.462 0.308 0 0.462 0 0 0.077 0.077 0.308
  • Checkpoint choice, screened on held-out instances 311-315 (mean q): step 8000 = 0.092, step 9999 = 0.192.

Identity and Version

Repository
Rena-Tian/b1k-2026-task20-ft1
Publisher
Rena Tian
Task
Robotics
Modality
Control
Library
Not stated by the source
Parameters
Not stated by the source
Languages
Not stated by the source
Revision
1290edcee49acc1328a49a8dbb8b39bfcde41960
First published
2026-10-09
Last updated
2026-10-09

Files and Weights

27 files, 12.6 GB in total.

Configuration1 file · 18.0 MB
Documentation1 file · 1.9 KB
Other24 files · 12.6 GB
Repository1 file · 2.8 KB
Every file
FileTypeSizeSHA-256
assets/b1k_2026_task20/norm_stats.jsonConfiguration18.0 MB ccd14a0210fc
README.mdDocumentation1.9 KB —
_CHECKPOINT_METADATAOther324 B —
params/_METADATAOther31.1 KB —
params/_shardingOther18.1 KB —
params/array_metadatas/process_0Other12.7 KB —
params/d/28eaa5efbfd8dedf66a2f3cd605bbf75Other2.9 KB —
params/manifest.ocdbtOther118 B —
params/ocdbt.process_0/d/0b075434ffd73548c797a69d1bcb6d36Other1.8 GB 4acd11b2c0ef
params/ocdbt.process_0/d/1718eeef200c100d2bda12f6510beda6Other2.2 GB 79a89cb9307d
params/ocdbt.process_0/d/1816da8c60b0f566d8833e2eea607b86Other5.7 KB —
params/ocdbt.process_0/d/1c5ee35a82d838fe80cf9a212893d78cOther608.9 MB e3de5ccbdc56
params/ocdbt.process_0/d/40dd18b25295a49c1d9c0074328619e9Other29.0 MB 8c25f5cd2fa9
params/ocdbt.process_0/d/4f91eefaca4356a3221d14a61e226c4aOther1.4 KB —
params/ocdbt.process_0/d/5c50a3b15b126e23b242708c10ac74daOther61.9 MB 4ff3a3bef0ce
params/ocdbt.process_0/d/5e34989c8845c2093e4f7bb52066ad7eOther3.1 GB de824772e7a1
params/ocdbt.process_0/d/75bf5ba6e69305d7a55caf9d3f7b355dOther59.0 MB df237d3dc755
params/ocdbt.process_0/d/8374876a79ffb5bef8ade09bb390d566Other2.9 KB —
params/ocdbt.process_0/d/9eecda4e863c4fd4b1de3794b200211aOther132.9 MB e4e638bab055
params/ocdbt.process_0/d/b011d7258363217cb60f51bc568f21b4Other2.2 GB bba3579cf2f5
params/ocdbt.process_0/d/c03bfcd10bbc784baf04784c2a553b78Other1.1 GB 4e4b63155d2b
params/ocdbt.process_0/d/e1ff4408229a2270a6bb6400727c50fbOther126.1 KB 2d5bc5f2b7e3
params/ocdbt.process_0/d/ed1d486dada180d2e2ca03c2f249ac9bOther105.0 MB 6f0e3b95b37a
params/ocdbt.process_0/d/f31a9ca08c1b0f91362b4f3a57bed6a1Other213 B —
params/ocdbt.process_0/d/f75f0219f2b7111b6b6f71f9b8bf1ed0Other1.1 GB c88f3b2b0d0b
params/ocdbt.process_0/manifest.ocdbtOther745 B —
.gitattributesRepository2.8 KB —

License and Download

License
apache-2.0
Access
Open weights, no gate
Download from Rena Tian

Released by Rena Tian through its official repository on Hugging Face. Read the license.

Questions About b1k-2026-task20-ft1

Can I use b1k-2026-task20-ft1 commercially?

Yes. b1k-2026-task20-ft1 is released under Apache License 2.0. The Apache License 2.0 is a permissive open-source license. It permits commercial use, modification and redistribution. It requires keeping the license and copyright notices and any NOTICE file, stating significant changes, and it includes an express patent grant from contributors.

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