metrics

In-block (same-level) directed edges

Layer 2　·　PCFG toy 4L d_model=448 / pcfg　·　matryoshka_hook_resid_post_L2　·　1,792 latents in 8 blocks　·　598,000 tokens over 2000 docs　·　edge: reverse coverage ≥ 0.5, both endpoints fire ≥ 20

Parent→child within a block (asymmetric containment); co-extensive pairs are reported as duplicates (renames/splits), never edges.

Block B0 (224 features)

• 154 directed edges, 6 duplicate pairs, 154 survive PMI>0; PolyFrac 8%, Gini 0.987.
• S_res: 3/154 edges are genuine refinements (0 children untestable).
• In-block superparents: 1 (e.g. F83 feature 83: 116 children, fires 37%).

parent → child	R	PMI	parent label	child label
121 → 118	1.00	1.39	feature 121	feature 118
121 → 204	1.00	1.39	feature 121	feature 204
121 → 25	1.00	1.38	feature 121	feature 25
121 → 101	0.99	1.38	feature 121	feature 101
121 → 209	0.99	1.38	feature 121	feature 209
212 → 42	0.99	1.34	feature 212	feature 42
212 → 160	0.99	1.34	feature 212	feature 160
164 → 118	0.98	1.79	feature 164	feature 118

Duplicate pairs (rename/split candidates): 9≈169 (feature 9); 101≈169 (feature 101); 121≈161 (feature 121); 121≈164 (feature 121); 161≈164 (feature 161); 164≈209 (feature 164)

Block B1 (224 features)

• 5 directed edges, 0 duplicate pairs, 5 survive PMI>0; PolyFrac 50%, Gini 0.978.
• S_res: 1/5 edges are genuine refinements (0 children untestable).

parent → child	R	PMI	parent label	child label
297 → 241	0.68	2.00	feature 297	feature 241
337 → 375	0.63	1.87	feature 337	feature 375
309 → 241	0.53	2.03	feature 309	feature 241
321 → 241	0.51	1.86	feature 321	feature 241
296 → 241	0.50	1.53	feature 296	feature 241

Block B2 (224 features)

• 1 directed edges, 0 duplicate pairs, 1 survive PMI>0; PolyFrac 0%, Gini 0.996.
• S_res: 1/1 edges are genuine refinements (0 children untestable).

parent → child	R	PMI	parent label	child label
608 → 517	0.74	5.36	feature 608	feature 517

Block B3 (224 features)

• 0 directed edges, 0 duplicate pairs, 0 survive PMI>0; PolyFrac 0%, Gini 0.000.

Block B4 (224 features)

• 0 directed edges, 0 duplicate pairs, 0 survive PMI>0; PolyFrac 0%, Gini 0.000.

Block B5 (224 features)

• 1 directed edges, 0 duplicate pairs, 1 survive PMI>0; PolyFrac 0%, Gini 0.996.
• S_res: 0/0 edges are genuine refinements (0 children untestable).

parent → child	R	PMI	parent label	child label
1152 → 1207	0.97	3.92	feature 1152	feature 1207

Block B6 (224 features)

• 0 directed edges, 0 duplicate pairs, 0 survive PMI>0; PolyFrac 0%, Gini 0.000.

Block B7 (224 features)

• 0 directed edges, 0 duplicate pairs, 0 survive PMI>0; PolyFrac 0%, Gini 0.000.