diff --git a/tutorials/examples/train_box.py b/tutorials/examples/train_box.py
index 5a3cf8dd..632d5b78 100644
--- a/tutorials/examples/train_box.py
+++ b/tutorials/examples/train_box.py
@@ -6,6 +6,7 @@
 
 python train_box.py --delta {0.1, 0.25} --tied {--uniform_pb} --loss {TB, DB}
 """
+
 from argparse import ArgumentParser
 
 import numpy as np
@@ -189,9 +190,11 @@ def main(args):  # noqa: C901
     if not args.uniform_pb:
         optimizer.add_param_group(
             {
-                "params": pb_module.last_layer.parameters()
-                if args.tied
-                else pb_module.parameters(),
+                "params": (
+                    pb_module.last_layer.parameters()
+                    if args.tied
+                    else pb_module.parameters()
+                ),
                 "lr": args.lr,
             }
         )
diff --git a/tutorials/examples/train_discreteebm.py b/tutorials/examples/train_discreteebm.py
index 3574fa2d..562bb2b4 100644
--- a/tutorials/examples/train_discreteebm.py
+++ b/tutorials/examples/train_discreteebm.py
@@ -10,6 +10,7 @@
 [Learning GFlowNets from partial episodes for improved convergence and stability](https://arxiv.org/abs/2209.12782)
 python train_hypergrid.py --ndim {2, 4} --height 12 --R0 {1e-3, 1e-4} --tied --loss {TB, DB, SubTB}
 """
+
 from argparse import ArgumentParser
 
 import torch
diff --git a/tutorials/examples/train_hypergrid.py b/tutorials/examples/train_hypergrid.py
index 4d4e3a25..f52932e9 100644
--- a/tutorials/examples/train_hypergrid.py
+++ b/tutorials/examples/train_hypergrid.py
@@ -10,6 +10,7 @@
 [Learning GFlowNets from partial episodes for improved convergence and stability](https://arxiv.org/abs/2209.12782)
 python train_hypergrid.py --ndim {2, 4} --height 12 --R0 {1e-3, 1e-4} --tied --loss {TB, DB, SubTB}
 """
+
 from argparse import ArgumentParser
 
 import torch