Unlearned Checkpoint

Field Value
Unlearning method SNMF
Base model google/gemma-2-2b-it
Target concept Golf
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 10
delta_out 10
feature_source all
k_features_embed 0
k_features_mlp_in 25
k_features_mlp_out 4
layer_hi_in 12
layer_hi_out 17
layer_lo_in 0
layer_lo_out 9
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 0.852 0.836
Specificity 0.637 0.311
Harmonic mean 0.729 0.454
Relearning QA (MC) โ€” 0.52

Full Evaluation (baseline โ†’ unlearned)

From evaluation/score_comparison.csv:

Metric Baseline (train) After unlearn (train) Baseline (test) After unlearn (test)
QA accuracy 0.86 0.34 0.8 0.34
QA fraction 1 0.148 1 0.164
SimDom accuracy 0.82 0.54 0.88 0.38
SimDom fraction 1 0.509 1 0.206
MMLU accuracy 0.52 0.48 0.551 0.441
MMLU fraction 1 0.852 1 0.635

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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