[Tutor] Help for coding

[James Kameni]

Hello,i am trying to solve the order batching problem using the tabu search in Jupyter Notebook and it doesn't work as i need.
Problem's definition:In manual order picking systems, order pickers walk or drive through a distribution warehouse (ref.file "Traversal.png") in order to collect items which are requested by (internal or external) customers. In order to perform these operations effciently, it is usually required that customer orders are combined into (more substantial) picking orders (Batch)  of limited size. The Order Batching Problem deals with the question of how a given set of customer orders should be combined such that the total length of all tours is minimized which are necessary to collect all items.
data:
list of items and distances : "TD.txt"customers orders and quantities: "Auftrag.txt"
code: order batching problem.ipynb
Error: I actually can't collect all items from orders requested by customers and put them into a batch. I only have a single solution.

can you give me tipps or some help?
ThanksJames
-------------- next part --------------
o	b	3
o	e	8
o	h	14
b	a	5
a	f	8
a	g	14
f	g	9
f	c	2
f	o	12
c	d	1
c	o	10
d	e	2
d	o	9
e	h	9
e	o	7
h	i	4
h	o	13
i	g	1
i	o	17
g	j	13
g	o	18
j	o	20
-------------- next part --------------
1	a	2		
1	b	3
1	c	1
2	d	5
2	e	2
2	a	7
3	f	2
3	g	6	
3	i	9		
4	h	1		
4	i	2
4	j	4