diff --git a/pina/condition/condition_interface.py b/pina/condition/condition_interface.py
index d31030d..eaee604 100644
--- a/pina/condition/condition_interface.py
+++ b/pina/condition/condition_interface.py
@@ -45,7 +45,7 @@ class ConditionInterface(metaclass=ABCMeta):
         objects is consistent.
 
         :param data_list: List of graph type objects.
-        :type data_list: torch_geometric.data.Data | Graph| 
+        :type data_list: torch_geometric.data.Data | Graph|
             list[torch_geometric.data.Data] | list[Graph]
 
         :raises ValueError: Input data must be either torch_geometric.data.Data
diff --git a/pina/condition/data_condition.py b/pina/condition/data_condition.py
index 5f158af..84fb540 100644
--- a/pina/condition/data_condition.py
+++ b/pina/condition/data_condition.py
@@ -26,8 +26,8 @@ class DataCondition(ConditionInterface):
         types of input data.
 
         :param input: Input data for the condition.
-        :type input: torch.Tensor | LabelTensor | Graph | 
-            torch_geometric.data.Data | list[Graph] | 
+        :type input: torch.Tensor | LabelTensor | Graph |
+            torch_geometric.data.Data | list[Graph] |
             list[torch_geometric.data.Data] | tuple[Graph] |
             tuple[torch_geometric.data.Data]
         :param conditional_variables: Conditional variables for the condition.
@@ -63,8 +63,8 @@ class DataCondition(ConditionInterface):
         variables (if any).
 
         :param input: Input data for the condition.
-        :type input: torch.Tensor | LabelTensor | Graph | 
-            torch_geometric.data.Data | list[Graph] | 
+        :type input: torch.Tensor | LabelTensor | Graph |
+            torch_geometric.data.Data | list[Graph] |
             list[torch_geometric.data.Data] | tuple[Graph] |
             tuple[torch_geometric.data.Data]
         :param conditional_variables: Conditional variables for the condition.
diff --git a/pina/condition/input_target_condition.py b/pina/condition/input_target_condition.py
index 7239051..78446e4 100644
--- a/pina/condition/input_target_condition.py
+++ b/pina/condition/input_target_condition.py
@@ -85,13 +85,13 @@ class InputTargetCondition(ConditionInterface):
         Initialize the InputTargetCondition, storing the input and target data.
 
         :param input: Input data for the condition.
-        :type input: torch.Tensor | LabelTensor | Graph | 
-            torch_geometric.data.Data | list[Graph] | 
+        :type input: torch.Tensor | LabelTensor | Graph |
+            torch_geometric.data.Data | list[Graph] |
             list[torch_geometric.data.Data] | tuple[Graph] |
             tuple[torch_geometric.data.Data]
         :param target: Target data for the condition.
-        :type target: torch.Tensor | LabelTensor | Graph | 
-            torch_geometric.data.Data | list[Graph] | 
+        :type target: torch.Tensor | LabelTensor | Graph |
+            torch_geometric.data.Data | list[Graph] |
             list[torch_geometric.data.Data] | tuple[Graph] |
             tuple[torch_geometric.data.Data]
 
diff --git a/pina/label_tensor.py b/pina/label_tensor.py
index 6a91a6c..9109083 100644
--- a/pina/label_tensor.py
+++ b/pina/label_tensor.py
@@ -668,7 +668,7 @@ class LabelTensor(torch.Tensor):
         Computes the summation of a list of :class:`LabelTensor` instances.
 
 
-        :param list[LabelTensor] tensors: A list of tensors to sum. All 
+        :param list[LabelTensor] tensors: A list of tensors to sum. All
             tensors must have the same shape and labels.
         :return: A new `LabelTensor` containing the element-wise sum of the
                  input tensors.