Unlearned Checkpoint

Field Value
Unlearning method SNMF
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
coverage_thresh 0.95
delta_embed 0
delta_in 4
delta_out 10
feature_source all
k_features_embed 0
k_features_mlp_in 36
k_features_mlp_out 17
layer_hi_in 25
layer_hi_out 8
layer_lo_in 0
layer_lo_out 0
n_tokens_edited 0
ratio_thresh 2
w_mode both

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

Headline scores used for checkpoint selection:

Metric Train (after unlearning) Test (after unlearning)
Efficacy 0.872 0.857
Specificity 0.52 0.486
Harmonic mean 0.651 0.62
Relearning QA (MC) โ€” 0.22

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 0.3
QA fraction 1 0.128 1 0.143
SimDom accuracy 0.62 0.38 0.74 0.44
SimDom fraction 1 0.351 1 0.388
MMLU accuracy 0.52 0.52 0.551 0.446
MMLU fraction 1 1 1 0.651

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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