Dataset Viewer
Auto-converted to Parquet Duplicate
feature_id
int32
0
2.05k
fire_count
int32
2
1.53k
total_tokens
int32
20k
20k
firing_rate
float64
0
0.08
mean_activation
float32
1.22
1.34k
max_activation
float32
1.37
1.43k
std_activation
float32
0.03
678
decoder_norm
float32
1
1
is_dead
bool
1 class
num_top_contexts
int32
2
8
top_activation
float32
1.37
1.43k
top_token
stringlengths
1
15
top_context_preview
stringlengths
23
179
hypothesis
stringclasses
0 values
evidence_level
stringclasses
1 value
0
203
20,000
0.01015
3.281749
7.664529
1.530601
1
false
8
7.664529
0
-@ inch guns weighed about 15 @,@ [[0]]00 pounds ( 6 @,@ 800
null
none
1
414
20,000
0.0207
3.512562
11.763391
1.979545
1
false
8
11.763391
finished
played them the idea for the song and when [ it ][[ finished]] , they looked at each other , a bit stunned , and
null
none
2
283
20,000
0.01415
2.86245
7.68989
1.197274
1
false
8
7.68989
tractive
off stump . Critics felt this change made the game unat[[tractive]] as it encouraged negative tactics at the expense of leg spin bowling
null
none
3
250
20,000
0.0125
2.800891
8.314801
1.335018
1
false
8
8.314801
extension
son invokes the Marxist theorist Louis Althusser 's[[ extension]] of the argument that ideology is ah
null
none
4
275
20,000
0.01375
2.49965
8.350952
1.189686
1
false
8
8.350952
search
time again we had to turn away in disgust ... One may[[ search]] in vain for a sustained pure thought , a truly Christian sentiment
null
none
5
420
20,000
0.021
3.897603
11.560295
2.054644
1
false
8
11.560295
his
Grey , Duchess of Suffolk , a niece of Henry VIII by[[ his]] younger sister Mary . On 25 May 15
null
none
6
398
20,000
0.0199
2.503
5.949122
0.859802
1
false
8
5.949122
Michigan
retaining walls . This makes it the largest freeway interchange in Western[[ Michigan]] . There are four overpasses which carry M @-@
null
none
7
171
20,000
0.00855
2.509774
7.515586
1.173932
1
false
8
7.515586
home
a major economic force of the city . Galveston is[[ home]] to six historic districts containing one of the largest and historically significant
null
none
8
202
20,000
0.0101
3.780856
12.155557
2.426497
1
false
8
12.155557
hx
Bc4 ! , winning ; 25.g4[[ hx]]g4 26.hxg4 Nxf2
null
none
9
241
20,000
0.01205
2.65046
9.199576
1.440148
1
false
8
9.199576
taken
ML 177 , the launch that had successfully[[ taken]] off some of the crew from Campbeltown , was sunk
null
none
10
418
20,000
0.0209
2.758917
8.189855
1.581113
1
false
8
8.189855
He
2 ranking in the world for a brief moment following Madrid .[[ He]] then participated in the Internazionali BNL d '
null
none
11
261
20,000
0.01305
2.942665
7.829015
1.285006
1
false
8
7.829015
returning
battle , took a mortally wounded bin Hattem prisoner before[[ returning]] to Zanzibar .
null
none
12
386
20,000
0.0193
2.916946
7.938008
1.118061
1
false
8
7.938008
bowl
the most ever recorded by a single Virginia Tech player in a[[ bowl]] game . Tech quarterback Steve Casey led the Hokies in passing
null
none
13
216
20,000
0.0108
2.787905
9.991224
1.266945
1
false
8
9.991224
back
develop the modern type ; today most Rocky Mountain Horses trace[[ back]] to this stallion . In 1986 ,
null
none
14
280
20,000
0.014
2.588955
5.641777
0.89414
1
false
8
5.641777
Instrument
and electrohop song , which incorporates elements of reggae .[[ Instrument]]ation is provided by a wobble bass and synthesizers .
null
none
15
344
20,000
0.0172
3.889896
12.955128
2.407031
1
false
8
12.955128
miles
ocene . The largest , Warm Lake , is 26[[ miles]] ( 42 km ) east of Cascade in Valley County
null
none
16
311
20,000
0.01555
3.170024
9.153908
1.63783
1
false
8
9.153908
0
b6 13 . 0 @-@ [[0]] Bf5 14 . Rb3 0
null
none
17
329
20,000
0.01645
2.922892
8.270031
1.558412
1
false
8
8.270031
0
graced the stage of the Imperial Theatre for a 2[[0]]10 production of Driving Miss Daisy . The largest event that
null
none
18
316
20,000
0.0158
2.882731
8.460704
1.61443
1
false
8
8.460704
be
[ the Royal Northern College of Music ] said they 'll[[ be]] able to train my voice up again . It 's the
null
none
19
262
20,000
0.0131
2.622773
11.89641
1.201047
1
false
8
11.89641
brief
er regained the # 2 ranking in the world for a[[ brief]] moment following Madrid . He then participated in the Internazional
null
none
20
223
20,000
0.01115
2.803299
9.397882
1.364808
1
false
8
9.397882
September
between 5 and 31 July . In August and[[ September]] 1945 Breese swept mines in the East
null
none
21
169
20,000
0.00845
4.163555
8.976368
1.698113
1
false
8
8.976368
"
four @-@ beat ambling gait known as the[[ "]] single @-@ foot " . Originally developed as a multi
null
none
22
283
20,000
0.01415
2.921113
10.200085
1.498118
1
false
8
10.200085
changes
of when you lose people that are close to you , it[[ changes]] your life and changes your perspective . When they came into the
null
none
23
123
20,000
0.00615
4.574061
16.809286
3.389794
1
false
8
16.809286
ful
" Joyful , Joy[[ful]] " is a song with a length of four minutes and twenty
null
none
24
160
20,000
0.008
3.133093
12.810518
2.165067
1
false
8
12.810518
spend
year ) . Hunter set conditions that would have required him to[[ spend]] four days a week , which he thought unacceptable .
null
none
25
266
20,000
0.0133
3.031485
9.174328
1.511551
1
false
8
9.174328
same
20 , 2014 . On the[[ same]] day , the team announced that it had reclaimed the history and
null
none
26
130
20,000
0.0065
3.151953
15.59586
1.767187
1
false
8
15.59586
State
NC[[ State]] went three and out after receiving the ball , and after Tech
null
none
27
545
20,000
0.02725
2.744249
11.187652
1.498626
1
false
8
11.187652
in
Kauai peaked at 5 @.@ 33[[ in]] ( 135 mm ) at Mount Wai '
null
none
28
241
20,000
0.01205
2.746734
9.475403
1.310099
1
false
8
9.475403
1
officially on the Columbia album The Bootleg Series Volumes [[1]] – 3 ( Rare & Unreleased ) 19
null
none
29
158
20,000
0.0079
3.148517
10.095943
1.548974
1
false
8
10.095943
ager
. He was commissioned to write the patriotic opera Ein Feldl[[ager]] in Schlesien to celebrate the reopening of the Berlin Royal
null
none
30
198
20,000
0.0099
3.145395
10.334119
1.740403
1
false
8
10.334119
following
the second single due to strong demands of radio stations on the[[ following]] day . The song contains elements of country and pop , and
null
none
31
657
20,000
0.03285
2.506314
8.672668
1.255326
1
false
8
8.672668
single
014 , Clarkson released the title track as the second[[ single]] and hosted an annual Christmas benefit concert , Miracle on Broadway ,
null
none
32
453
20,000
0.02265
3.013829
10.18605
1.848001
1
false
8
10.18605
has
82 ) , was a university grant proposal writer . She[[ has]] a brother , Peter , who is eight years older . Fey
null
none
33
228
20,000
0.0114
2.912539
8.293828
1.213286
1
false
8
8.293828
oz
, strident politics and dubious contextualizations ; and it o[[oz]]es with the same smug sense of moral and intellectual superiority
null
none
34
477
20,000
0.02385
2.658921
7.587307
1.195313
1
false
8
7.587307
goals
2 @-@ game season , and scored 14[[ goals]] , a good return for a player in his position ; an
null
none
35
164
20,000
0.0082
3.581247
9.865261
2.142924
1
false
8
9.865261
:
's life , an Argentine film company released Eva Perón[[ :]] The True Story . The Argentine production starred actress Esther Goris
null
none
36
162
20,000
0.0081
2.911311
7.214929
1.359795
1
false
8
7.214929
rainfall
3 mm ) in Kihei , an area that rarely records[[ rainfall]] in August . Throughout the island , the total amount of water
null
none
37
290
20,000
0.0145
2.639946
12.701105
1.767926
1
false
8
12.701105
is
Elementary , Lisa is presented with a brain teaser , which she[[ is]] unable to solve . Following this incident , Lisa finds herself unable
null
none
38
289
20,000
0.01445
2.649311
7.906887
1.010444
1
false
8
7.906887
certain
7th and 18th centuries is not known for[[ certain]] . In 1714 the trustees agreed that the
null
none
39
265
20,000
0.01325
2.528069
7.30368
1.108078
1
false
8
7.30368
Rome
bishops . After his consecration , Berhtwald travelled to[[ Rome]] to obtain the support of Pope Sergius I , who wrote
null
none
40
238
20,000
0.0119
2.75868
7.488393
1.143773
1
false
8
7.488393
time
Commission on Transportation , a position that involved extensive travel at a[[ time]] when his health was starting to fail . The last decade of
null
none
41
244
20,000
0.0122
3.480529
9.79826
1.828233
1
false
8
9.79826
having
out there ... we kind of did what we both do and[[ having]] O.D.B took it to another level . He was my
null
none
42
307
20,000
0.01535
2.498829
10.165195
1.709101
1
false
8
10.165195
land
William Williams to find a home ground for English Rugby . The[[ land]] for the ground was purchased the following year for £ 5
null
none
43
205
20,000
0.01025
2.696496
8.654924
1.381664
1
false
8
8.654924
is
6 freeway . No such access to 68th Street[[ is]] provided for westbound M @-@ 6 traffic ,
null
none
44
692
20,000
0.0346
4.161656
7.547552
1.133295
1
false
8
7.547552
.
Sclerodermatineae genera have been established[[ .]] Studies have demonstrated that Astraeus , Pisolithus ,
null
none
45
466
20,000
0.0233
3.050672
9.074916
1.308425
1
false
8
9.074916
equ
in the 2016 Wimbledon quarterfinals ,[[ equ]]alling Jimmy Connors ' all @-@ time records of
null
none
46
811
20,000
0.04055
2.671715
6.973637
1.265365
1
false
8
6.973637
that
Britain , regardless of what his Foreign Office might advise , and[[ that]] her visit would not be viewed as a state visit . Fraser
null
none
47
171
20,000
0.00855
3.720852
12.00178
2.376565
1
false
8
12.00178
did
fired and the new superintendent was put in , and not only[[ did]] they do our hospital , they did all the hospitals , mental
null
none
48
117
20,000
0.00585
2.746043
10.817863
1.524529
1
false
8
10.817863
uffy
@-@ Tang Clan , as well as production from P[[uffy]] . She spoke highly of the remix , complimenting Puffy
null
none
49
274
20,000
0.0137
2.967897
11.895554
1.931377
1
false
8
11.895554
as
de Scheyfye . Modern historians have considered them either[[ as]] part of a plot , or as " routine actions of dyn
null
none
50
181
20,000
0.00905
3.17229
11.963901
1.738787
1
false
8
11.963901
Civil
waters enforcing the arms blockade during the first year of the Spanish[[ Civil]] War of 1936 – 39 .
null
none
51
308
20,000
0.0154
3.19791
7.428813
1.503897
1
false
8
7.428813
-
that in a family with a stay @-@ at @[[-]]@ home dad arrangement , the maternal and paternal influences are equally
null
none
52
246
20,000
0.0123
2.781738
9.311989
1.771152
1
false
8
9.311989
?
Black is better . 25 @.@ b6[[ ?]] Overlooking Black 's threat . 25 ... N
null
none
53
309
20,000
0.01545
3.378457
6.590569
1.437666
1
false
8
6.590569
1
5 ! 20 ... Nxf2 ? 2[[1]].Qxd5 ! wins . 21 . Nd4
null
none
54
202
20,000
0.0101
2.870152
10.051485
1.47181
1
false
8
10.051485
prior
and minor engagements with the advancing Austrian , German and Ottoman columns[[ prior]] to the battle , the 1st and 2nd
null
none
55
235
20,000
0.01175
2.650507
5.869632
0.915001
1
false
8
5.869632
strained
History of India . His relationship with the Pakistani government had become[[ strained]] , and so he declined to return to work for them for
null
none
56
288
20,000
0.0144
2.790269
14.563793
1.924759
1
false
8
14.563793
study
child development at Oakton Community College in Illinois , conducted a[[ study]] comparing households with a stay @-@ at @-@
null
none
57
298
20,000
0.0149
2.724969
9.580844
1.297735
1
false
8
9.580844
uts
attempts to kill Tintin , but monkeys throw cocon[[uts]] at the stowaway that knock him unconscious . A monkey
null
none
58
344
20,000
0.0172
2.779891
8.998414
1.436999
1
false
8
8.998414
was
Fey[[ was]] born on May 18 , 1970
null
none
59
250
20,000
0.0125
2.809007
7.501569
1.17833
1
false
8
7.501569
bole
It is filled with precisely the kind of shrill hyper[[bole]] that Finkelstein rightly deplores in much of the
null
none
60
251
20,000
0.01255
2.88142
10.20106
1.414119
1
false
8
10.20106
return
the Pakistani government had become strained , and so he declined to[[ return]] to work for them for a third year .
null
none
61
122
20,000
0.0061
2.999063
9.615199
1.579518
1
false
8
9.615199
ex
involve the gods in accomplishing the goal . Such rituals co[[ex]]isted with private offerings and prayers , and all three were accepted
null
none
62
346
20,000
0.0173
2.742151
11.895874
1.642048
1
false
8
11.895874
especially
lands and ferns are plentiful in the more moist regions ,[[ especially]] in the western parts . It is home to hundreds of plant
null
none
63
398
20,000
0.0199
3.127097
9.130112
1.51924
1
false
8
9.130112
State
running into the kicker penalty on the first punt attempt , NC[[ State]] punted the ball away . After the kick , Tech took
null
none
64
281
20,000
0.01405
2.640262
11.31587
1.538393
1
false
8
11.31587
ut
utaries of the Snake River , which itself is a trib[[ut]]ary of the Columbia River in the Pacific
null
none
65
239
20,000
0.01195
2.642537
8.30291
1.155907
1
false
8
8.30291
sentence
20 years , although it did not interfere with the[[ sentence]] imposed upon Carty .
null
none
66
207
20,000
0.01035
2.642563
6.565529
1.16783
1
false
8
6.565529
last
the threat from Bruges would not be finally stopped until the[[ last]] days of the war , when the town was liberated by Allied
null
none
67
249
20,000
0.01245
2.647764
7.795557
1.338208
1
false
8
7.795557
of
time when his health was starting to fail . The last decade[[ of]] his career during which he worked on his communications studies was an
null
none
68
237
20,000
0.01185
2.921329
8.499682
1.402247
1
false
8
8.499682
dyn
. At the time the marriages took place , however , their[[ dyn]]astical implications were not considered significant by even the most suspicious
null
none
69
328
20,000
0.0164
2.499043
7.692648
1.037473
1
false
8
7.692648
en
1950 Wheeler ran a training excavation at Moh[[en]]jo @-@ daro ; there , he was joined
null
none
70
183
20,000
0.00915
3.050184
6.394891
1.325179
1
false
8
6.394891
Nd
21.Qxd5 ! wins . 21 .[[ Nd]]4 Bxd4 22 . Bxd4 e
null
none
71
219
20,000
0.01095
2.817929
8.162958
1.22018
1
false
8
8.162958
arts
form courses were developed allowing students to commence advanced studies in the[[ arts]] and sciences . By the 1950s ,
null
none
72
278
20,000
0.0139
2.783535
9.001116
1.378633
1.000001
false
8
9.001116
,@
4 @[[,@]] 130 kg ) with 80 @-
null
none
73
239
20,000
0.01195
2.959925
8.657986
1.344927
1
false
8
8.657986
keep
emoniously kicked out of ' the school after begging them to[[ keep]] him on with just two courses a semester ( $ 1
null
none
74
196
20,000
0.0098
2.9422
9.003778
1.971024
1
false
8
9.003778
!
Bc2 , winning ; 25.Qe1[[ !]] ? Rc2 ! with advantage ; and 25.f
null
none
75
150
20,000
0.0075
2.90278
9.838107
1.793256
1
false
8
9.838107
however
management . He gave more thought to his future in baseball ,[[ however]] , and after graduation decided to return to the Giants organization and
null
none
76
256
20,000
0.0128
2.792186
9.549048
1.436925
1
false
8
9.549048
to
intimidated the couple . He admitted he were a murderer and tried[[ to]] attack Geoff with a knife . James said he " put himself
null
none
77
192
20,000
0.0096
2.705323
7.308799
1.226215
1
false
8
7.308799
way
of the crew from Campbeltown , was sunk on her[[ way]] out of the estuary . ML 269 ,
null
none
78
317
20,000
0.01585
3.310133
10.737352
2.318852
1
false
8
10.737352
it
contains several grains of truth ; and like any such theory ,[[ it]] is both irrational and insidious .
null
none
79
808
20,000
0.0404
3.214178
9.83387
1.912589
1
false
8
9.83387
In
of the home and the mother stays home with the children .[[ In]] this type of arrangement , the mother 's influence is extremely
null
none
80
362
20,000
0.0181
2.390674
6.284207
0.99232
1
false
8
6.284207
gods
a myth , or even threatened a deity , to involve the[[ gods]] in accomplishing the goal . Such rituals coexisted with
null
none
81
143
20,000
0.00715
3.569145
13.062534
2.658286
1
false
8
13.062534
another
out of the estuary . ML 269 ,[[ another]] torpedo @-@ armed boat , had the unenviable
null
none
82
3
20,000
0.00015
1,202.060181
1,237.998657
25.433737
1
false
3
1,237.998657
Bd
2[[ Bd]]7 would transpose to the Portisch – Tal game below .
null
none
83
288
20,000
0.0144
3.219302
11.266304
2.152412
1
false
8
11.266304
Criminal
guilty . Both sentences were referred to the Court of Appeal ([[ Criminal]] Division ) as " unduly lenient " by Her Majesty
null
none
84
227
20,000
0.01135
4.318412
8.485375
2.003842
1
false
8
8.485375
"
@ marks suggests that this dismemberment was done carefully ;[[ "]] they do not suggest frenzied hacking or mutilation .
null
none
85
248
20,000
0.0124
2.76422
7.726614
1.140772
1
false
8
7.726614
reopening
opera Ein Feldlager in Schlesien to celebrate the[[ reopening]] of the Berlin Royal Opera House in 1844
null
none
86
442
20,000
0.0221
2.733463
8.142472
0.983171
1
false
8
8.142472
is
In 1946 , Inn[[is]] was elected president of the Royal Society of Canada , the country
null
none
87
233
20,000
0.01165
2.748045
6.54211
1.144156
1
false
8
6.54211
gods
oracles , run by temples , that were supposed to convey[[ gods]] ' answers to questions . Amulets and other images of
null
none
88
217
20,000
0.01085
2.573359
5.920716
1.121744
1
false
8
5.920716
lowered
wooden pole connected to an iron lever that could be raised or[[ lowered]] by means of pulleys .
null
none
89
3
20,000
0.00015
1,215.686279
1,252.523193
26.253571
1
false
3
1,252.523193
Bd
2[[ Bd]]7 would transpose to the Portisch – Tal game below .
null
none
90
446
20,000
0.0223
4.432716
10.803434
2.821075
1
false
8
10.803434
9
htwald was consecrated on 29 June 6[[9]]3 , having travelled to France for his consecration as arch
null
none
91
490
20,000
0.0245
2.713257
9.058357
1.247705
1
false
8
9.058357
James
were a murderer and tried to attack Geoff with a knife .[[ James]] said he " put himself in harms way " to save Nicole
null
none
92
360
20,000
0.018
2.751583
8.459721
1.27785
1
false
8
8.459721
River
western portions of the Emmett Ranger District by the Weiser[[ River]] . All four rivers are tributaries of the Snake River
null
none
93
201
20,000
0.01005
2.667773
8.137217
1.205684
0.999999
false
8
8.137217
forms
Personal interaction with the gods took many[[ forms]] . People who wanted information or advice consulted oracles , run
null
none
94
152
20,000
0.0076
3.443243
15.095756
2.597147
1
false
8
15.095756
stay
2014 that found 2 million men to be[[ stay]] @-@ at @-@ home dads . However ,
null
none
95
253
20,000
0.01265
2.719586
7.59313
1.417681
1
false
8
7.59313
3
okies in passing yardage , completing nine of his 2[[3]] pass attempts for 119 yards and one interception .
null
none
96
230
20,000
0.0115
3.183456
7.752918
1.40536
1
false
8
7.752918
as
development . Together , using Carey 's chorus and idea ,[[ as]] well as the melody they had produced , they wrote and composed
null
none
97
619
20,000
0.03095
2.877682
6.873802
1.333156
1
false
8
6.873802
He
Victorian effort to articulate a British culture that could be exported .[[ He]] argues that " Ulysses " forms part of the
null
none
98
198
20,000
0.0099
3.022117
8.442459
1.081421
1
false
8
8.442459
infr
classified in section Mycena of Mycena in the[[ infr]]ageneric scheme of Rudolph Arnold Maas Geesteranus
null
none
99
144
20,000
0.0072
4.890929
12.152782
3.247569
1
false
8
12.152782
g
: Rowson analyzes 25.e3 ? ! Nx[[g]]3 24.fxg3 Bc2 2
null
none
End of preview. Expand in Data Studio

BrainPatch feature database — Qwen2.5-1.5B-Instruct

Per-feature statistics for a Top-K sparse autoencoder trained on layer 18 (residual_post) of a frozen Qwen/Qwen2.5-1.5B-Instruct at revision 989aa7980e4cf806f80c7fef2b1adb7bc71aa306.

Loading

from datasets import load_dataset

features = load_dataset("09Catho/BrainPatch-Features-Qwen2.5-1.5B", "features", split="train")
contexts = load_dataset("09Catho/BrainPatch-Features-Qwen2.5-1.5B", "contexts", split="train")

print(features[727])
print(contexts.filter(lambda r: r["feature_id"] == 727)["context_preview"])

The two configs join on feature_id.

Configs

features — 2048 rows, one per SAE feature (default)

Column Type Meaning
feature_id int32 Index into the SAE dictionary
fire_count int32 Tokens on which the feature was active
total_tokens int32 Tokens analysed (20,000)
firing_rate float64 fire_count / total_tokens
mean_activation float32 Mean over firing tokens only
max_activation float32 Largest activation observed
std_activation float32 Std over firing tokens only
decoder_norm float32 L2 norm of the decoder column (constrained to 1)
is_dead bool Never fired over the corpus
num_top_contexts int32 Contexts recorded in the contexts config
top_activation float32 Activation of the strongest context
top_token string Token text of the strongest context
top_context_preview string Strongest context, token marked [[like this]]
hypothesis string Candidate description. Null for every row.
evidence_level string Evidence behind hypothesis. "none" for every row.

contexts — one row per top-activating occurrence

Column Type Meaning
feature_id int32 Joins to the features config
rank int32 0 = strongest activation for that feature
activation float32 Activation value
example_index int32 Index into the extraction corpus
token_position int32 Position within that token block
token_id int32 Tokenizer id
token_text string The activating token
context_before / context_after string ±12 tokens either side
context_preview string Rendered as before[[token]]after

Both tables are flat — no nested structs — so the viewer, search, filter and statistics all work.

Files outside the configs

These are preserved for provenance and are deliberately not part of any config, because their schemas differ from the feature table and merging them is what broke the viewer in the first published version:

Path What
metadata/smoke_v0/summary.json Aggregate dictionary statistics
metadata/smoke_v0/activation_manifest.json Corpus provenance, shard index, seeds
metadata/smoke_v0/sae_config.json SAE architecture and training configuration
raw/smoke_v0/features.jsonl The original nested JSONL, verbatim

Nothing was lost in the restructure; raw/smoke_v0/features.jsonl is the exact file the Parquet tables were built from.

Dictionary statistics

Features 2048 (d_in 1536, expansion 1.33×)
Top-K 32 (measured L0 exactly 32.0)
Tokens analysed 20,000
Alive / dead 2048 / 0
Mean firing rate (alive) 0.015625
Median firing rate (alive) 0.01355
Max firing rate 0.0766
Decoder norms mean 1.0, min 0.9999992, max 1.0000007
input_scale 0.5610531069008018

mean_activation and std_activation are computed over firing tokens only. Averaging in a Top-K SAE's structural zeros would report k/d_sae times the true magnitude.

Scientific status

Every hypothesis is null and every evidence_level is "none".

Top-activating contexts are correlational evidence. A feature whose top examples look thematically coherent is a feature that correlates with that theme in this corpus — it is not "the X feature" until steering it changes behaviour and scale-matched controls do not.

In the accompanying intervention experiment the control failed: a scale-matched random direction of identical L2 norm moved the model's output further from baseline (0.847) than the tested feature direction did (0.710). Treat these statistics as descriptive only.

The SAE is also deliberately undertrained — 20,000 activations against a 2048-feature dictionary, train explained variance 0.762 versus validation 0.658. It exists to prove the pipeline, not to produce a good dictionary.

Read this before ranking by max_activation

This table contains a documented pathology, and it is visible directly in the viewer:

sort by max_activation, descending

The top 32 features all fire on 3–6 tokens out of 20,000 and all share the top token " Bd" — chess notation from a handful of wikitext articles — at activations above 1200 against a dictionary median of 9.06. The SAE has shattered a few rare, high-norm tokens across many near-duplicate features, which is a characteristic symptom of training on too little data.

feature 727 dictionary
fire_count 5 median 271, mean 312.5
max_activation 1429.77 median 9.06

The published intervention experiment selected its target and its "unrelated feature" control from this cluster, which is why that control was retracted. Filter on firing_rate before using this table to choose intervention candidates. Features near the median firing rate are far more likely to be representative.

See the research log on GitHub for the full account.

Corpus and licensing

Statistics are derived from Salesforce/wikitext (wikitext-2-raw-v1, train split), CC BY-SA 3.0, derived from Wikipedia.

The corpus is not redistributed here. The contexts config carries short attributed snippets (±12 tokens around each activating token) for human inspection; everything else is derived numerical metadata.

This repository: Apache-2.0.

Downloads last month
19