From 2287a181dabee1e0c449f8ab3c69025353646011 Mon Sep 17 00:00:00 2001
From: Nicolas <Nicolas@nonan.net>
Date: Thu, 1 Jan 2026 14:57:47 +0100
Subject: [PATCH] neg() und abs() stencil added in copapy

---
 src/copapy/_autograd.py    |  7 +++++--
 src/copapy/_basic_types.py | 10 ++++------
 tests/test_autograd.py     | 23 ++++++++++++++++++++++-
 3 files changed, 31 insertions(+), 9 deletions(-)

diff --git a/src/copapy/_autograd.py b/src/copapy/_autograd.py
index 3abd97e..4840805 100644
--- a/src/copapy/_autograd.py
+++ b/src/copapy/_autograd.py
@@ -89,8 +89,11 @@ def grad(x: Any, y: value[Any] | Sequence[value[Any]] | vector[Any] | tensor[Any
             elif opn == 'sqrt':
                 add_grad(a, g * (0.5 / cp.sqrt(a)))
 
-            #elif opn == 'abs':
-            #    add_grad(x, g * cp.sign(x))
+            elif opn == 'abs':
+                add_grad(a, g * cp.sign(a))
+
+            elif opn == 'neg':
+                add_grad(a, -b)
 
             elif opn == 'sin':
                 add_grad(a, g * cp.cos(a))
diff --git a/src/copapy/_basic_types.py b/src/copapy/_basic_types.py
index e71077a..6a9ba6d 100644
--- a/src/copapy/_basic_types.py
+++ b/src/copapy/_basic_types.py
@@ -230,13 +230,11 @@ class value(Generic[TNum]):
     def __rfloordiv__(self, other: NumLike) -> Any:
         return add_op('floordiv', [other, self])
 
-    def __abs__(self: TCPNum) -> TCPNum:
-        return cp.abs(self)  # type: ignore
+    def __abs__(self: 'value[TNum]') -> 'value[TNum]':
+        return cp.abs(self)
 
-    def __neg__(self: TCPNum) -> TCPNum:
-        if self.dtype == 'float':
-            return cast(TCPNum, add_op('sub', [value(0.0), self]))
-        return cast(TCPNum, add_op('sub', [value(0), self]))
+    def __neg__(self: 'value[TNum]') -> 'value[TNum]':
+        return add_op('neg', [self])
 
     def __gt__(self, other: TVarNumb) -> 'value[int]':
         return add_op('gt', [self, other], dtype='bool')
diff --git a/tests/test_autograd.py b/tests/test_autograd.py
index f8b113d..fb79f55 100644
--- a/tests/test_autograd.py
+++ b/tests/test_autograd.py
@@ -13,7 +13,7 @@ def test_autograd():
     c += c + 1
     c += 1 + c + (-a)
     d += d * 2 + cp.relu(b + a)
-    d += 3 * d + cp.relu(b - a)
+    d += 3 * d + cp.relu(-a + b)
     e = c - d
     f = e**2
     g = f / 2.0
@@ -34,5 +34,26 @@ def test_autograd():
     assert pytest.approx(dg[1], abs=1e-4) == 645.57725  # pyright: ignore[reportUnknownMemberType]
 
 
+def test_autograd_extended():
+    a = value(-4.0)
+    b = value(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 - cp.sin(-d)
+    f = cp.abs(e**2)
+    g = f / 2.0
+    g += 10.0 / f
+
+    dg = grad(g, (a, b))
+
+    tg = cp.Target()
+    tg.compile(g, dg)
+    tg.run()
+
+
 if __name__ == "__main__":
     test_autograd()