I want to dye the Networkx link to gradation.

import matplotlib.pyplot as plt
from mpl_toolkits.mplot3d import Axes 3D
import networkx as nx
import numpy as np
import tkinter.filedialog as fd

path=fd.askopenfilename()

# 3.2_Read Topology Information (.txt)
with open(path, "r") as tf:
    line=tf.read().split()
run=int(len(line)/2)

# 3.3_Load list of edges
G=nx.read_edgelist(path,nodetype=int)
edge_size = nx.number_of_edges(G)# Number of links
node_size = nx.number_of_nodes(G)#Nodes

# The spring_layout algorithm generates three-dimensional coordinates
pos=nx.spring_layout(G,dim=3)
# conversion from dictionary to array
pos_ary=np.array ([pos[n]for n in G])

# Visualize from here
config=plt.figure()
ax=Axes3D(fig)

# dot the positions of each node
ax.scatter(
    pos_ary [:,0],
    pos_ary [:,1],
    pos_ary [:,2],
    s = 200,
)

# display a label on a node
for n in G.nodes:
    ax.text(*pos[n],n)

# Viewing Edges
for in G.edges:
    node0_pos=pos[e[0]]
    node1_pos=pos[e[1]]
    xx = [node0_pos[0], node1_pos[0]]
    yy=[node0_pos[1], node1_pos[1]]
    zz = [node0_pos[2], node1_pos[2]]
    ax.plot(xx,yy,zz,cmap='ocean')

# View Completed Diagram
plt.show()

110
1 11
1 14
1 20
2 9
2 12
2 13
2 15
2 16
3 10
3 11
3 20
4 5
4 8
4 9
5 4
5 9
6 7
6 14
7 6
7 18
8 4
8 11
8 14
8 19
9 2
9 4
9 5
10 1
10 3
11 1
11 3
11 8
11 13
12 2
12 16
13 2
13 11
14 1
14 6
14 8
15 2
15 17
15 21
16 2
16 12
17 15
18 7
18 21
19 8
19 20
20 1
20 3
20 19
20 21
21 15
21 18
21 20

Traceback (most recent call last):
  File "C:/Program Files/Python 36/Question .py", line 47, in<module>
    ax.plot(xx,yy,zz,cmap='ocean')
  File "C:\Users\███\AppData\Roaming\Python\Python36\site-packages\mpl_tools\mplot3d\axes3d.py", line 1471, inplot
    lines=super().plot(xs, ys, *args, **kwargs)
  File "C:\Users\███\AppData\Roaming\Python\Python36\site-packages\matplotlib\axes\_axes.py", line 1743, implot
    lines=[*self._get_lines(*args, data=data,**kwargs)]
  File "C:\Users\███ App\AppData\Roaming\Python\Python36\site-packages\matplotlib\axes\_base.py", line 273, in __call__
    field from self._plot_args(this,kwargs)
  File "C:\Users\███\AppData\Roaming\Python\Python36\site-packages\matplotlib\axes\_base.py", line 419, in_plot_args
    for jin range (max(ncx,ncy))]
  File "C:\Users\███\AppData\Roaming\Python\Python36\site-packages\matplotlib\axes\_base.py", line 419, in <listcomp>
    for jin range (max(ncx,ncy))]
  File "C:\Users\███\AppData\Roaming\Python\Python36\site-packages\matplotlib\axes\_base.py", line 312, in_makeline
    seg=mlines.Line2D(x,y,**kw)
  File "C:\Users\███\AppData\Roaming\Python\Python36\site-packages\matplotlib\lines.py", line 390, in __init__
    self.update(kwargs)
  File "C:\Users\███\AppData\Roaming\Python\Python36\site-packages\matplotlib\artist.py", line 996, in update
    raiseAttributeError(f"{type(self).__name__!r}object"
AttributeError: 'Line2D' object has no property'cmap'