From 29c52bf0f0981d4ea8e12e86237365da2b225ef7 Mon Sep 17 00:00:00 2001
From: Jonas Knobloch <jonas.knobloch@t-online.de>
Date: Mon, 4 May 2026 15:39:45 +0200
Subject: Add parameter to set hidden dimension

---
 research/sander/analyze.go         | 10 +++++-----
 research/sander/cmd/sander/main.go |  3 ++-
 research/sander/experiment.go      |  4 +++-
 research/sander/extract.go         | 11 ++++++-----
 4 files changed, 16 insertions(+), 12 deletions(-)

diff --git a/research/sander/analyze.go b/research/sander/analyze.go
index c58195d..6abc9b8 100644
--- a/research/sander/analyze.go
+++ b/research/sander/analyze.go
@@ -6,11 +6,10 @@ import (
 	"fmt"
 )
 
-var (
-	sqlSimilarity = `
+var sqlSimilarity = `
 		CREATE TABLE similarity_buffer AS
 		WITH centroid AS (
-		    SELECT list(avg_val ORDER BY idx)::FLOAT[768] AS vec
+		    SELECT list(avg_val ORDER BY idx)::FLOAT[%d] AS vec
 		    FROM (
 		        SELECT idx, avg(val) AS avg_val
 		        FROM embeddings
@@ -22,7 +21,6 @@ var (
 		SELECT e.token_id, array_distance(e.embedding, c.vec) AS distance
 		FROM embeddings e, centroid c
 `
-)
 
 func (e *Experiment) Analyze(db *sql.DB) error {
 	ctx := context.Background()
@@ -41,7 +39,9 @@ func (e *Experiment) Analyze(db *sql.DB) error {
 		return err
 	}
 
-	if _, err := tx.ExecContext(ctx, sqlSimilarity); err != nil {
+	query := fmt.Sprintf(sqlSimilarity, e.hiddenDim)
+
+	if _, err := tx.ExecContext(ctx, query); err != nil {
 		return fmt.Errorf("similarity: %w", err)
 	}
 
diff --git a/research/sander/cmd/sander/main.go b/research/sander/cmd/sander/main.go
index 56f1488..ae7f7b9 100644
--- a/research/sander/cmd/sander/main.go
+++ b/research/sander/cmd/sander/main.go
@@ -5,6 +5,7 @@ import (
 	"log"
 	"path"
 
+	"go.jknobloc.com/x/gpt2"
 	"go.jknobloc.com/x/research/sander"
 	"go.jknobloc.com/x/shelf"
 	"go.jknobloc.com/x/tokenizer/bpe"
@@ -33,7 +34,7 @@ func run(src, dst string) error {
 	}
 
 	t := must(bpe.NewTokenizerFromFiles(path.Join(src, "vocab.json"), path.Join(src, "merges.txt"), cfg))
-	e := must(sander.NewExperiment(dst, path.Join(src, "model.onnx"), sander.UnusedTokensMBPE(t)))
+	e := must(sander.NewExperiment(dst, path.Join(src, "model.onnx"), sander.UnusedTokensMBPE(t), gpt2.ConfigDefault().HiddenDim))
 
 	return e.Run()
 }
diff --git a/research/sander/experiment.go b/research/sander/experiment.go
index 1521cf8..bcad99c 100644
--- a/research/sander/experiment.go
+++ b/research/sander/experiment.go
@@ -14,13 +14,15 @@ type Experiment struct {
 	name      string
 	model     string
 	reference map[int64]struct{}
+	hiddenDim int
 }
 
-func NewExperiment(name, model string, reference map[int64]struct{}) (*Experiment, error) {
+func NewExperiment(name, model string, reference map[int64]struct{}, hiddenDim int) (*Experiment, error) {
 	e := &Experiment{
 		name:      name,
 		model:     model,
 		reference: reference,
+		hiddenDim: hiddenDim,
 	}
 
 	return e, nil
diff --git a/research/sander/extract.go b/research/sander/extract.go
index de31b1f..c72fe7f 100644
--- a/research/sander/extract.go
+++ b/research/sander/extract.go
@@ -3,6 +3,7 @@ package sander
 import (
 	"database/sql"
 	"database/sql/driver"
+	"fmt"
 
 	"go.jknobloc.com/x/onnx"
 	"go.jknobloc.com/x/research/lesci"
@@ -20,16 +21,16 @@ func (e *Experiment) Extract(db *sql.DB) error {
 		shape = s
 	}
 
-	if shape[1] != 768 {
-		panic("unimplemented")
+	if shape[1] != e.hiddenDim {
+		panic("shape mismatch")
 	}
 
 	t := tensor.NewDense[float32](shape, data)
 
-	if _, err := db.Exec(`
+	if _, err := db.Exec(fmt.Sprintf(`
 	    DROP TABLE IF EXISTS embeddings;
-	    CREATE TABLE embeddings (token_id INTEGER, embedding FLOAT[768], reference BOOLEAN);
-	`); err != nil {
+	    CREATE TABLE embeddings (token_id INTEGER, embedding FLOAT[%d], reference BOOLEAN);
+	`, e.hiddenDim)); err != nil {
 		return err
 	}
 
-- 
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