optimize imports

proxtoolbox/algorithms/algorithm.py

-from numpy import angle, exp, sum
-from numpy.linalg import norm
+from numpy import exp
+
 try:
     from tqdm import tqdm, tqdm_notebook
     load_tqdm = True

proxtoolbox/algorithms/feasibilityIterateMonitor.py

 
+from numpy import angle, trace, exp, sqrt, matmul, reshape
+from numpy.linalg import norm
+
 from proxtoolbox.algorithms.iterateMonitor import IterateMonitor
 from proxtoolbox.utils.cell import Cell, isCell
 from proxtoolbox.utils.size import size_matlab
-import numpy as np
-from numpy import zeros, angle, trace, exp, sqrt, sum, matmul, array, reshape
-from numpy.linalg import norm
+
 
 class FeasibilityIterateMonitor(IterateMonitor):
     """

proxtoolbox/experiments/experiment.py

-from proxtoolbox import algorithms
-from proxtoolbox import proxoperators
-from proxtoolbox.proxoperators.proxoperator import ProxOperator
-from proxtoolbox.utils.cell import Cell, isCell
+import json
 import matplotlib as mpl
 import matplotlib.pyplot as plt
-from matplotlib.pyplot import subplots, show, figure
-import sys
+import numpy as np
 import os
-import importlib
+import scipy
 import time
 from datetime import datetime
-import json
-import scipy
-import numpy as np
+from math import sqrt
 from numpy import square, mod
 from numpy.linalg import norm
-from math import sqrt
+
+from proxtoolbox import algorithms
+from proxtoolbox import proxoperators
 
 
 class ExperimentMetaClass(type):