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package sander
import (
"context"
"database/sql"
"image/color"
"path"
"gonum.org/v1/plot"
"gonum.org/v1/plot/plotter"
"gonum.org/v1/plot/vg"
"gonum.org/v1/plot/vg/draw"
)
func (e *Experiment) Plot(db *sql.DB) error {
var rows *sql.Rows
if r, err := db.QueryContext(context.Background(), `
SELECT s.token_id, s.distance, e.reference
FROM similarity_buffer s
JOIN embeddings e ON s.token_id = e.token_id
ORDER BY s.token_id ASC
`); err != nil {
return err
} else {
rows = r
}
defer rows.Close()
var pts plotter.XYZs
for rows.Next() {
var id, distance float64
var reference bool
if err := rows.Scan(&id, &distance, &reference); err != nil {
return err
}
z := 0.0
if reference {
z = 1.0
}
pts = append(pts, plotter.XYZ{X: id, Y: distance, Z: z})
}
if err := rows.Err(); err != nil {
return err
}
return render(pts, path.Join(e.name, "similarity_scatter.png"))
}
func render(pts plotter.XYZs, out string) error {
p := plot.New()
p.Y.Label.Text = "Euclidean Distance"
p.Y.Min = 0
p.Y.Max = 5
var candidate, reference plotter.XYZs
for _, pt := range pts {
if pt.Z == 1.0 {
reference = append(reference, pt)
} else {
candidate = append(candidate, pt)
}
}
if err := addScatter(p, candidate, color.RGBA{A: 64}); err != nil {
return err
}
if err := addScatter(p, reference, color.RGBA{R: 255, G: 69, B: 0, A: 255}); err != nil {
return err
}
return p.Save(10*vg.Inch, 6*vg.Inch, out)
}
func addScatter(p *plot.Plot, pts plotter.XYZs, c color.Color) error {
s, err := plotter.NewScatter(pts)
if err != nil {
return err
}
s.Color = c
s.Radius = vg.Points(2)
s.Shape = draw.CircleGlyph{}
p.Add(s)
return nil
}
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