change repo structure; modify readme

tensorneat/problem/func_fit/xor.py

@@ -0,0 +1,35 @@
+import numpy as np
+
+from .func_fit import FuncFit
+
+
+class XOR(FuncFit):
+
+    def __init__(self, error_method: str = 'mse'):
+        super().__init__(error_method)
+
+    @property
+    def inputs(self):
+        return np.array([
+            [0, 0],
+            [0, 1],
+            [1, 0],
+            [1, 1]
+        ])
+
+    @property
+    def targets(self):
+        return np.array([
+            [0],
+            [1],
+            [1],
+            [0]
+        ])
+
+    @property
+    def input_shape(self):
+        return 4, 2
+
+    @property
+    def output_shape(self):
+        return 4, 1