chore: import upstream snapshot with attribution

2026-07-13 13:30:25 +08:00
commit f19b2512d7
562 changed files with 38082 additions and 0 deletions
@@ -0,0 +1,28 @@
+from prml.nn.tensor.constant import Constant
+from prml.nn.tensor.tensor import Tensor
+from prml.nn.function import Function
+
+
+class Negative(Function):
+    """
+    element-wise negative
+    y = -x
+    """
+
+    def forward(self, x):
+        x = self._convert2tensor(x)
+        self.x = x
+        if isinstance(self.x, Constant):
+            return Constant(-x.value)
+        return Tensor(-x.value, function=self)
+
+    def backward(self, delta):
+        dx = -delta
+        self.x.backward(dx)
+
+
+def negative(x):
+    """
+    element-wise negative
+    """
+    return Negative().forward(x)