diff --git a/src/loss.py b/src/loss.py
new file mode 100644
index 0000000..43d80e4
--- /dev/null
+++ b/src/loss.py
@@ -0,0 +1,12 @@
+import numpy as np
+from abc import ABC, abstractmethod
+
+
+class Loss(ABC):
+    @abstractmethod
+    def __call__(self, output: np.ndarray, target: np.ndarray) -> float:
+        """"""
+
+    @abstractmethod
+    def get_diffrential(self, output: np.ndarray, target: np.ndarray, loss: np.ndarray| None = None) -> np.ndarray:
+        """"""