From 257fe96bb373255bccc41d06c5dc9b1d0bf36e69 Mon Sep 17 00:00:00 2001
From: Nicolas Kruse <nicolas@nonan.net>
Date: Thu, 4 Dec 2025 18:19:43 +0100
Subject: [PATCH] auto gfrad test added

---
 tests/test_autograd.py | 38 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 38 insertions(+)
 create mode 100644 tests/test_autograd.py

diff --git a/tests/test_autograd.py b/tests/test_autograd.py
new file mode 100644
index 0000000..f8ecaf1
--- /dev/null
+++ b/tests/test_autograd.py
@@ -0,0 +1,38 @@
+from copapy import variable, grad
+import copapy as cp
+import pytest
+
+
+def test_autograd():
+    # Validate against micrograd results from Andrej Karpathy
+    # https://github.com/karpathy/micrograd/blob/master/test/test_engine.py
+    a = variable(-4.0)
+    b = variable(2.0)
+    c = a + b
+    d = a * b + b**3
+    c += c + 1
+    c += 1 + c + (-a)
+    d += d * 2 + cp.relu(b + a)
+    d += 3 * d + cp.relu(b - a)
+    e = c - d
+    f = e**2
+    g = f / 2.0
+    g += 10.0 / f
+
+    dg = grad(g, (a, b))
+
+    tg = cp.Target()
+    tg.compile(g, dg)
+    tg.run()
+
+
+    print(f"g = {tg.read_value(g)}")
+    print(f"dg/da = {tg.read_value(dg[0])}   grad:{dg[0]}    val:{a} = {tg.read_value(a)}")
+    print(f"dg/db = {tg.read_value(dg[1])}   grad:{dg[1]}    val:{b} = {tg.read_value(b)}")
+
+    assert pytest.approx(dg[0], abs=1e-4) == 138.83381  # pyright: ignore[reportUnknownMemberType]
+    assert pytest.approx(dg[1], abs=1e-4) == 645.57725  # pyright: ignore[reportUnknownMemberType]
+
+
+if __name__ == "__main__":
+    test_autograd()