diff --git a/components/pid/kalman.py b/components/pid/kalman.py
index a2e9d36..ce012e8 100644
--- a/components/pid/kalman.py
+++ b/components/pid/kalman.py
@@ -1,10 +1,10 @@
 import numpy as np
 from numpy.linalg import inv
-from matplotlib.pyplot import plot, figure, subplot, title, xlabel, ylabel, grid, show
+from matplotlib.pyplot import plot, figure, subplot, grid, show
 
 
 class Kalman:
-	def __init__(self, params={}):
+	def __init__(self, params):
 		dt = params['dt']
 		var_P = params['var_P']
 		var_Q = params['var_Q']
@@ -132,4 +132,3 @@ if __name__ == '__main__':
 	show()
 
 	print("End of program")
-
diff --git a/components/pid/pid.py b/components/pid/pid.py
index f1a7c0a..d0905a2 100644
--- a/components/pid/pid.py
+++ b/components/pid/pid.py
@@ -1,4 +1,3 @@
-import numpy as np
 
 
 class Pid:
diff --git a/components/pid/temp_controller.py b/components/pid/temp_controller.py
index 81a6161..507a6f5 100644
--- a/components/pid/temp_controller.py
+++ b/components/pid/temp_controller.py
@@ -1,5 +1,5 @@
 from components.plant.pot import Pot
-from matplotlib.pyplot import plot, figure, subplot, title, xlabel, ylabel, grid, show, legend
+from matplotlib.pyplot import plot, figure, subplot, grid, show, legend
 from components.pid import Pid, Kalman
 import numpy as np
 from utils.value import AttributeChange