feat(frontend-python): implement dumping/loading of auto rounders

frontends/concrete-python/concrete/fhe/extensions/round_bit_pattern.py

@@ -4,7 +4,7 @@ Declaration of `round_bit_pattern` function, to provide an interface for rounded
 
 import threading
 from copy import deepcopy
-from typing import Any, Callable, Iterable, List, Tuple, Union
+from typing import Any, Callable, Dict, Iterable, List, Tuple, Union
 
 import numpy as np
 
@@ -123,6 +123,36 @@ class AutoRounder:
 
         # pylint: enable=protected-access,too-many-branches
 
+    def dump_dict(self) -> Dict:
+        """
+        Dump properties of the rounder to a dict.
+        """
+
+        return {
+            "target_msbs": self.target_msbs,
+            "is_adjusted": self.is_adjusted,
+            "input_min": self.input_min,
+            "input_max": self.input_max,
+            "input_bit_width": self.input_bit_width,
+            "lsbs_to_remove": self.lsbs_to_remove,
+        }
+
+    @classmethod
+    def load_dict(cls, properties: Dict) -> "AutoRounder":
+        """
+        Load previously dumped rounder.
+        """
+
+        result = AutoRounder(target_msbs=properties["target_msbs"])
+
+        result.is_adjusted = properties["is_adjusted"]
+        result.input_min = properties["input_min"]
+        result.input_max = properties["input_max"]
+        result.lsbs_to_remove = properties["lsbs_to_remove"]
+        result.input_bit_width = properties["input_bit_width"]
+
+        return result
+
 
 def round_bit_pattern(
     x: Union[int, np.integer, List, np.ndarray, Tracer],