diff --git a/comfy/k_diffusion/sampling.py b/comfy/k_diffusion/sampling.py
index 2a08066a0..c0c51d51a 100644
--- a/comfy/k_diffusion/sampling.py
+++ b/comfy/k_diffusion/sampling.py
@@ -18,7 +18,7 @@ import comfy.memory_management
 
 
 def trange(*args, **kwargs):
-    if comfy.memory_management.aimdo_allocator == None:
+    if comfy.memory_management.aimdo_allocator is None:
         return trange_(*args, **kwargs)
 
     pbar = trange_(*args, **kwargs, smoothing=1.0)
@@ -26,7 +26,6 @@ def trange(*args, **kwargs):
     pbar.set_postfix_str("  Model Initializing ...  ")
 
     _update = pbar.update
-    initialized = False
 
     def warmup_update(n=1):
         pbar._i += 1
diff --git a/comfy/utils.py b/comfy/utils.py
index 9471eed20..c620e7545 100644
--- a/comfy/utils.py
+++ b/comfy/utils.py
@@ -32,7 +32,6 @@ from comfy.cli_args import args, enables_dynamic_vram
 import json
 import time
 import mmap
-import ctypes
 
 import packaging
 
@@ -96,7 +95,8 @@ def load_safetensors(ckpt):
 
     sd = {}
     for name, info in header.items():
-        if name == "__metadata__": continue
+        if name == "__metadata__":
+            continue
 
         start, end = info["data_offsets"]
         sd[name] = data_area[start:end].view(_TYPES[info["dtype"]]).view(info["shape"])
diff --git a/execution.py b/execution.py
index 4148baaf5..a25bd36cd 100644
--- a/execution.py
+++ b/execution.py
@@ -1,4 +1,3 @@
-import gc
 import copy
 import heapq
 import inspect