Unlearned Checkpoint

Field Value
Unlearning method RMU
Base model google/gemma-2-2b-it
Target concept Uranium
Checkpoint type Full Model Weights
Rank / seed 100 / 42
Train eval protocol mc

Unlearning Configuration

Selected hyperparameters (from unlearned_checkpoints.json):

Parameter Value
alpha 50
delta_embed 0
k_features_embed 0
layer_id 8
layer_ids 6,7,8
lr 0.0003
n_tokens_edited 0
param_ids 6
setting_name S2_lid8_L678
steering 1000

Primary Unlearning Metrics (held-out test, MC protocol)

Headline scores used for checkpoint selection:

Metric Train (after unlearning) Test (after unlearning)
Efficacy 0.872 0.8
Specificity 0.754 0.649
Harmonic mean 0.808 0.716
Relearning QA (MC) โ€” 0.44

Full Evaluation (baseline โ†’ unlearned)

From evaluation/score_comparison.csv:

Metric Baseline (train) After unlearn (train) Baseline (test) After unlearn (test)
QA accuracy 0.64 0.3 0.6 0.32
QA fraction 1 0.128 1 0.2
SimDom accuracy 0.62 0.5 0.74 0.5
SimDom fraction 1 0.676 1 0.51
MMLU accuracy 0.52 0.48 0.551 0.518
MMLU fraction 1 0.852 1 0.89

Files in This Repository

File Description
unlearned_checkpoints.json Checkpoint metadata & hyperparameters
evaluation/evaluation_summary.json Full evaluation payload (train/test/relearning)
evaluation/score_comparison.csv Baseline vs. unlearned comparison table
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