change a lot a lot a lot!!!!!!!

core/state.py

@@ -0,0 +1,29 @@
+from jax.tree_util import register_pytree_node_class
+
+
+@register_pytree_node_class
+class State:
+
+    def __init__(self, **kwargs):
+        self.__dict__['state_dict'] = kwargs
+
+    def update(self, **kwargs):
+        return State(**{**self.state_dict, **kwargs})
+
+    def __getattr__(self, name):
+        return self.state_dict[name]
+
+    def __setattr__(self, name, value):
+        raise AttributeError("State is immutable")
+
+    def __repr__(self):
+        return f"State ({self.state_dict})"
+
+    def tree_flatten(self):
+        children = list(self.state_dict.values())
+        aux_data = list(self.state_dict.keys())
+        return children, aux_data
+
+    @classmethod
+    def tree_unflatten(cls, aux_data, children):
+        return cls(**dict(zip(aux_data, children)))