diff --git a/tensordict/nn/probabilistic.py b/tensordict/nn/probabilistic.py
index 28f0ce2de..75c326c7a 100644
--- a/tensordict/nn/probabilistic.py
+++ b/tensordict/nn/probabilistic.py
@@ -9,7 +9,7 @@
 import warnings
 
 from textwrap import indent
-from typing import Any, Dict, List, Optional
+from typing import Any, Dict, List, Optional, overload, OrderedDict
 
 import torch
 
@@ -791,6 +791,30 @@ class ProbabilisticTensorDictSequential(TensorDictSequential):
 
     """
 
+    @overload
+    def __init__(
+        self,
+        modules: OrderedDict,
+        partial_tolerant: bool = False,
+        return_composite: bool | None = None,
+        aggregate_probabilities: bool | None = None,
+        include_sum: bool | None = None,
+        inplace: bool | None = None,
+    ) -> None:
+        ...
+
+    @overload
+    def __init__(
+        self,
+        modules: List[TensorDictModuleBase | ProbabilisticTensorDictModule],
+        partial_tolerant: bool = False,
+        return_composite: bool | None = None,
+        aggregate_probabilities: bool | None = None,
+        include_sum: bool | None = None,
+        inplace: bool | None = None,
+    ) -> None:
+        ...
+
     def __init__(
         self,
         *modules: TensorDictModuleBase | ProbabilisticTensorDictModule,
@@ -815,7 +839,7 @@ def __init__(
                 "ProbabilisticTensorDictSequential (unless return_composite is set to ``True``)."
             )
         # if the modules not including the final probabilistic module return the sampled
-        # key we wont be sampling it again, in that case
+        # key we won't be sampling it again, in that case
         # ProbabilisticTensorDictSequential is presumably used to return the
         # distribution using `get_dist` or to sample log_probabilities
         _, out_keys = self._compute_in_and_out_keys(modules[:-1])
diff --git a/tensordict/nn/sequence.py b/tensordict/nn/sequence.py
index e668f37fe..3f20b4195 100644
--- a/tensordict/nn/sequence.py
+++ b/tensordict/nn/sequence.py
@@ -488,7 +488,9 @@ def select_subsequence(
             return type(self)(*modules)
         else:
             keys = [key for key in self.module if self.module[key] in modules]
-            modules_dict = OrderedDict(**{key: val for key, val in zip(keys, modules)})
+            modules_dict = collections.OrderedDict(
+                **{key: val for key, val in zip(keys, modules)}
+            )
             return type(self)(modules_dict)
 
     def _run_module(
@@ -565,8 +567,10 @@ def __getitem__(self, index: int | slice | str) -> TensorDictModuleBase:
         else:
             return type(self)(*self.module.__getitem__(index))
 
-    def __setitem__(self, index: int, tensordict_module: TensorDictModuleBase) -> None:
+    def __setitem__(
+        self, index: int | slice | str, tensordict_module: TensorDictModuleBase
+    ) -> None:
         return self.module.__setitem__(idx=index, module=tensordict_module)
 
-    def __delitem__(self, index: int | slice) -> None:
+    def __delitem__(self, index: int | slice | str) -> None:
         self.module.__delitem__(idx=index)