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SN120 · Affine
Every Bittensor Daily mention of SN120 Affine, newest first. Price changes are snapshots from each edition.
24h change +0.81%
- What happened
- SN120 (Affine)'s on-chain weight-setting froze overnight after the writer's scoring step began running past its time limit, causing stale weights and leaving the dashboard's network-data.json stuck on an earlier epoch; the team raised the limit and restored a fresh weight set. Separately, a community member reported that the submission logic was only accepting hotkeys with multiple leading zeros, which some miners were allegedly exploiting through repeated registrations. Training continued through this period, moving to 256 tasks per epoch from epoch 54 onward, with the held-out checkpoint score rising from .594 to .75 before dropping back to .656, which the team attributed to noise on a small 32-problem evaluation set.
- Community
- Several community members flagged the frozen weights and asked the team to check the dashboard, while a validator posted specifics on the owner validator's repeated resubmission of an identical weight vector and raised fairness concerns for newly registered miners who were receiving no weight. Another participant separately asked how miner weights are calculated if submissions are no longer verified, citing concerns about cheating.
- Official
- The team confirmed the freeze was caused by the scoring step exceeding its time limit, raised the limit, and reported a fresh weight set on chain with 244 UIDs including the newest registrations; a later update confirmed the dashboard was updating again through epoch 58.
24h change −1.78%
- What happened
- Affine (SN120) published migration code for a new MiMo trainer and later cut over to the MiMo-V2.6-Distill-Qwen-9B checkpoint with a new GRPO objective at global epoch 189, requiring miners to upgrade their runtime before continuing to mine. The team reported the first public MiMo epochs, with the signed fixed32 evaluation moving from 18/32 to 19/32 and then to 21/32 across successive updates, while cautioning this reflects answer-formatting corrections rather than confirmed learning gains. An audit flagged some closed MiMo task groups that passed grading checks but disagreed with the prescribed cached sampler at a token boundary, prompting an ongoing investigation. Separately, SN120 lowered min_difficulty and cut max_validators from 64 to 1, and enabled proof-of-work registration allowing miners to register with zero TAO.
- Community
- Miners and the team discussed why GRPO training had stalled, pointing to a small math dataset causing repeated rollout submissions, registration costs that favor miners with more slots, and concerns that miners prioritize TAO rewards over actual model improvement. Suggestions included expanding the dataset and requiring miners to submit batches from their first N trajectories rather than cherry-picked samples.
- Official
- The team published the MiMo migration code, confirmed the cutover at epoch 189, reported audit diagnostics on the cached-sampler mismatch, and noted that score corrections for answer formatting do not change the official signed 18/32 to 19/32 results.