Unlearned Checkpoint

Field Value
Unlearning method SNMF
Base model google/gemma-2-2b-it
Target concept Baseball
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 1
delta_out 10
feature_source all
k_features_embed 0
k_features_mlp_in 33
k_features_mlp_out 29
layer_hi_in 12
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 0.746 0.615
Specificity 0.771 0.502
Harmonic mean 0.758 0.553
Relearning QA (MC) โ€” 0.46

Full Evaluation (baseline โ†’ unlearned)

From evaluation/score_comparison.csv:

Metric Baseline (train) After unlearn (train) Baseline (test) After unlearn (test)
QA accuracy 0.84 0.4 0.64 0.4
QA fraction 1 0.254 1 0.385
SimDom accuracy 0.68 0.52 0.74 0.42
SimDom fraction 1 0.628 1 0.347
MMLU accuracy 0.52 0.54 0.551 0.524
MMLU fraction 1 1 1 0.91

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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