[system-a] line -- test samplingObjective

TODO.md

@@ -1,6 +1,7 @@
 # system-a
 
-[system-a] using `samplingObjective` in target tests
+[system-a] `quad` -- test `samplingObjective`
+[system-a] `plane` -- test `samplingObjective`
 
 # the-book
 

src/system-a/targets/line.test.ts

@@ -3,6 +3,7 @@ import { test } from "node:test"
 import { tensorAlmostEqual, tensorReal } from "../Tensor.js"
 import { gradientDescent } from "../gradientDescent.js"
 import { l2Loss } from "../loss.js"
+import { samplingObjective } from "../samplingObjective.js"
 import { line } from "./line.js"
 
 test("line", () => {
@@ -26,3 +27,19 @@ test("line -- gradientDescent", () => {
   assert(tensorAlmostEqual(rs, [1, 0], 10e-1))
   assert(tensorAlmostEqual(rs, [1.05, 0], 10e-6))
 })
+
+test("line -- gradientDescent + samplingObjective ", () => {
+  const xs = [2, 1, 4, 3]
+  const ys = [1.8, 1.2, 4.2, 3.3]
+
+  const objective = samplingObjective(l2Loss(line), xs, ys, {
+    batchSize: 4,
+  })
+
+  const rs = gradientDescent(objective, [0, 0], {
+    revs: 1000,
+    learningRate: 0.01,
+  })
+
+  assert(tensorAlmostEqual(rs, [1, 0], 10e-1))
+})