From 3fe37224ccc2500e7e767e5fc00163ef61182828 Mon Sep 17 00:00:00 2001
From: Jonas Knobloch <jonas.knobloch@t-online.de>
Date: Fri, 17 Apr 2026 16:07:14 +0200
Subject: Add sander module

---
 research/sander/extract.go | 52 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 52 insertions(+)
 create mode 100644 research/sander/extract.go

(limited to 'research/sander/extract.go')

diff --git a/research/sander/extract.go b/research/sander/extract.go
new file mode 100644
index 0000000..de31b1f
--- /dev/null
+++ b/research/sander/extract.go
@@ -0,0 +1,52 @@
+package sander
+
+import (
+	"database/sql"
+	"database/sql/driver"
+
+	"go.jknobloc.com/x/onnx"
+	"go.jknobloc.com/x/research/lesci"
+	"go.jknobloc.com/x/tensor"
+)
+
+func (e *Experiment) Extract(db *sql.DB) error {
+	var data []float32
+	var shape []int
+
+	if d, s, err := onnx.ExtractInitializer(e.model, "transformer.wte.weight"); err != nil {
+		return err
+	} else {
+		data = d
+		shape = s
+	}
+
+	if shape[1] != 768 {
+		panic("unimplemented")
+	}
+
+	t := tensor.NewDense[float32](shape, data)
+
+	if _, err := db.Exec(`
+	    DROP TABLE IF EXISTS embeddings;
+	    CREATE TABLE embeddings (token_id INTEGER, embedding FLOAT[768], reference BOOLEAN);
+	`); err != nil {
+		return err
+	}
+
+	return lesci.AppendRows(db, "embeddings", func(appendFunc lesci.AppendFunc) error {
+		for i := range shape[0] {
+			embedding, ok := t.Select(0, i).Contiguous().Data()
+
+			if !ok {
+				panic("")
+			}
+
+			_, reference := e.reference[int64(i)]
+
+			if err := appendFunc([]driver.Value{int32(i), embedding, reference}); err != nil {
+				return err
+			}
+		}
+		return nil
+	})
+}
-- 
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