avoid nested closures in module (ml-explore#759)

python/mlx/nn/layers/base.py

@@ -7,6 +7,42 @@
 from mlx.utils import tree_flatten, tree_unflatten
 
 
+def _unwrap(model, value_key, value, filter_fn, map_fn, is_leaf_fn):
+    if is_leaf_fn(model, value_key, value):
+        return map_fn(value)
+
+    elif isinstance(value, Module):
+        return {
+            k: _unwrap(value, k, v, filter_fn, map_fn, is_leaf_fn)
+            for k, v in value.items()
+            if filter_fn(value, k, v)
+        }
+
+    elif isinstance(value, dict):
+        nd = {}
+        for k, v in v.items():
+            tk = f"{value_key}.{k}"
+            nd[k] = (
+                _unwrap(model, tk, v, filter_fn, map_fn, is_leaf_fn)
+                if filter_fn(model, tk, v)
+                else {}
+            )
+        return nd
+
+    elif isinstance(value, list):
+        nl = []
+        for i, vi in enumerate(value):
+            tk = f"{value_key}.{i}"
+            nl.append(
+                _unwrap(model, tk, vi, filter_fn, map_fn, is_leaf_fn)
+                if filter_fn(model, tk, vi)
+                else {}
+            )
+        return nl
+
+    raise RuntimeError("Unexpected leaf found while traversing the module")
+
+
 class Module(dict):
     """Base class for building neural networks with MLX.
 
@@ -98,10 +134,13 @@ def __getattr__(self, key: str):
         if key in self:
             return self[key]
         else:
-            raise AttributeError(f"{type(self)!r} has no attribute {key!r}")
+            super(Module, self).__getattr__(key, val)
 
     def __setattr__(self, key: str, val: Any):
-        self[key] = val
+        if isinstance(val, (mx.array, dict, list, tuple)):
+            self[key] = val
+        else:
+            super(Module, self).__setattr__(key, val)
 
     def load_weights(
         self,
@@ -245,31 +284,11 @@ def filter_and_map(
         is_leaf_fn = is_leaf_fn or (
             lambda m, k, v: not isinstance(v, (Module, dict, list))
         )
-
-        def unwrap(vk, v):
-            if is_leaf_fn(self, vk, v):
-                return map_fn(v)
-
-            if isinstance(v, Module):
-                return v.filter_and_map(filter_fn, map_fn, is_leaf_fn)
-
-            if isinstance(v, dict):
-                nd = {}
-                for k, v in v.items():
-                    tk = f"{vk}.{k}"
-                    nd[k] = unwrap(tk, v) if filter_fn(self, tk, v) else {}
-                return nd
-
-            if isinstance(v, list):
-                nl = []
-                for i, vi in enumerate(v):
-                    tk = f"{vk}.{i}"
-                    nl.append(unwrap(tk, vi) if filter_fn(self, tk, vi) else {})
-                return nl
-
-            raise RuntimeError("Unexpected leaf found while traversing the module")
-
-        return {k: unwrap(k, v) for k, v in self.items() if filter_fn(self, k, v)}
+        return {
+            k: _unwrap(self, k, v, filter_fn, map_fn, is_leaf_fn)
+            for k, v in self.items()
+            if filter_fn(self, k, v)
+        }
 
     def parameters(self):
         """Recursively return all the :class:`mlx.core.array` members of this Module