diff --git a/invokeai/app/api/routers/sessions.py b/invokeai/app/api/routers/sessions.py
index c3cb654a04..5f6228a1e3 100644
--- a/invokeai/app/api/routers/sessions.py
+++ b/invokeai/app/api/routers/sessions.py
@@ -48,7 +48,7 @@ async def create_session(
 )
 async def create_batch(
     graph: Optional[Graph] = Body(default=None, description="The graph to initialize the session with"),
-    batches: list[Batch] = Body(description="Batch config to apply to the given graph")
+    batches: list[Batch] = Body(description="Batch config to apply to the given graph"),
 ) -> BatchProcess:
     """Creates and starts a new new batch process"""
     session = ApiDependencies.invoker.services.batch_manager.run_batch_process(batches, graph)
diff --git a/invokeai/app/services/batch_manager.py b/invokeai/app/services/batch_manager.py
index 2607964a27..8acd5f9a7b 100644
--- a/invokeai/app/services/batch_manager.py
+++ b/invokeai/app/services/batch_manager.py
@@ -1,4 +1,3 @@
-
 import networkx as nx
 import uuid
 import copy
@@ -21,6 +20,8 @@ from invokeai.app.services.invoker import Invoker
 
 
 InvocationsUnion = Union[BaseInvocation.get_invocations()]  # type: ignore
+
+
 class Batch(BaseModel):
     data: list[InvocationsUnion] = Field(description="Mapping of ")
     node_id: str = Field(description="ID of the node to batch")
@@ -28,52 +29,44 @@ class Batch(BaseModel):
 
 class BatchProcess(BaseModel):
     batch_id: Optional[str] = Field(default_factory=uuid.uuid4().__str__, description="Identifier for this batch")
-    sessions: list[str] = Field(description="Tracker for which batch is currently being processed", default_factory=list)
+    sessions: list[str] = Field(
+        description="Tracker for which batch is currently being processed", default_factory=list
+    )
     batches: list[Batch] = Field(
         description="List of batch configs to apply to this session",
         default_factory=list,
     )
-    batch_indices: list[int] = Field(description="Tracker for which batch is currently being processed", default_factory=list)
+    batch_indices: list[int] = Field(
+        description="Tracker for which batch is currently being processed", default_factory=list
+    )
     graph: Graph = Field(description="The graph being executed")
 
 
 class BatchManagerBase(ABC):
     @abstractmethod
-    def start(
-        self,
-        invoker: Invoker
-    ):
+    def start(self, invoker: Invoker):
         pass
 
     @abstractmethod
-    def run_batch_process(
-        self,
-        batches: list[Batch],
-        graph: Graph
-    ) -> BatchProcess:
+    def run_batch_process(self, batches: list[Batch], graph: Graph) -> BatchProcess:
         pass
 
     @abstractmethod
-    def cancel_batch_process(
-        self,
-        batch_process_id: str
-    ):
+    def cancel_batch_process(self, batch_process_id: str):
         pass
 
 
 class BatchManager(BatchManagerBase):
     """Responsible for managing currently running and scheduled batch jobs"""
+
     __invoker: Invoker
     __batches: list[BatchProcess]
 
-
     def start(self, invoker) -> None:
         # if we do want multithreading at some point, we could make this configurable
         self.__invoker = invoker
         self.__batches = list()
-        local_handler.register(
-            event_name=EventServiceBase.session_event, _func=self.on_event
-        )
+        local_handler.register(event_name=EventServiceBase.session_event, _func=self.on_event)
 
     async def on_event(self, event: Event):
         event_name = event[1]["event"]
@@ -85,22 +78,22 @@ class BatchManager(BatchManagerBase):
                 await self.process(event)
 
         return event
-    
+
     async def process(self, event: Event):
         data = event[1]["data"]
         batchTarget = None
         for batch in self.__batches:
-            if data['graph_execution_state_id'] in batch.sessions:
+            if data["graph_execution_state_id"] in batch.sessions:
                 batchTarget = batch
                 break
-        
+
         if batchTarget == None:
             return
-        
+
         if sum(batchTarget.batch_indices) == 0:
             self.__batches = [batch for batch in self.__batches if batch != batchTarget]
             return
-        
+
         batchTarget.batch_indices = self._next_batch_index(batchTarget)
         ges = self._next_batch_session(batchTarget)
         batchTarget.sessions.append(ges.id)
@@ -114,15 +107,14 @@ class BatchManager(BatchManagerBase):
         sorted_nodes = nx.topological_sort(g)
         for npath in sorted_nodes:
             node = graph.get_node(npath)
-            (index, batch) = next(((i,b) for i,b in enumerate(batches) if b.node_id in node.id), (None, None))
+            (index, batch) = next(((i, b) for i, b in enumerate(batches) if b.node_id in node.id), (None, None))
             if batch:
                 batch_index = batch_process.batch_indices[index]
                 datum = batch.data[batch_index]
                 datum.id = node.id
                 graph.update_node(npath, datum)
-        
-        return GraphExecutionState(graph=graph)
 
+        return GraphExecutionState(graph=graph)
 
     def _next_batch_index(self, batch_process: BatchProcess):
         batch_indicies = batch_process.batch_indices.copy()
@@ -132,19 +124,14 @@ class BatchManager(BatchManagerBase):
                 break
         return batch_indicies
 
-
-    def run_batch_process(
-        self,
-        batches: list[Batch],
-        graph: Graph
-    ) -> BatchProcess:
+    def run_batch_process(self, batches: list[Batch], graph: Graph) -> BatchProcess:
         batch_indices = list()
         for batch in batches:
-            batch_indices.append(len(batch.data)-1)
+            batch_indices.append(len(batch.data) - 1)
         batch_process = BatchProcess(
-            batches = batches,
-            batch_indices = batch_indices,
-            graph = graph,
+            batches=batches,
+            batch_indices=batch_indices,
+            graph=graph,
         )
         ges = self._next_batch_session(batch_process)
         batch_process.sessions.append(ges.id)
@@ -153,8 +140,5 @@ class BatchManager(BatchManagerBase):
         self.__invoker.invoke(ges, invoke_all=True)
         return batch_process
 
-    def cancel_batch_process(
-        self,
-        batch_process_id: str
-    ):
+    def cancel_batch_process(self, batch_process_id: str):
         self.__batches = [batch for batch in self.__batches if batch.id != batch_process_id]