diff --git a/pocomc/flow.py b/pocomc/flow.py
index ec4e00b..206c815 100644
--- a/pocomc/flow.py
+++ b/pocomc/flow.py
@@ -1,4 +1,4 @@
-from typing import Union, Optional, Tuple, Dict, List
+from typing import Tuple
 
 import numpy as np
 import copy
diff --git a/pocomc/mcmc.py b/pocomc/mcmc.py
index 30c91c6..3ae9931 100644
--- a/pocomc/mcmc.py
+++ b/pocomc/mcmc.py
@@ -1,8 +1,7 @@
 import numpy as np
 import torch
 
-from .tools import numpy_to_torch, torch_to_numpy, flow_numpy_wrapper
-from .student import fit_mvstud
+from .tools import flow_numpy_wrapper
 
 @torch.no_grad()
 def preconditioned_pcn(state_dict: dict,
diff --git a/pocomc/particles.py b/pocomc/particles.py
index b96656c..08d213d 100644
--- a/pocomc/particles.py
+++ b/pocomc/particles.py
@@ -1,4 +1,3 @@
-from typing import Any
 import numpy as np
 
 class Particles: