Comments (4)
The primary difficulty that I'm facing in defining a standard for VRPLIB is how to incorporate the pickup and delivery VRP variants. I haven't worked enough with these type of problems to know what kind of format would make sense, specifically how we generalize locations/clients to these settings.
I know that LKH did some stuff with this. I should study these examples in more detail (see http://webhotel4.ruc.dk/~keld/research/LKH-3/).
BACKHAUL_SECTION
3 9 30 33 49 54 66 77 82 85 90 -1
BACKHAUL_SECTION :
This section is used for specifying VRPB instances. It contains a list of backhaul nodes. This
section is terminated by a -1.
In pickup and delivery, we are dealing with requests.
I'm not sure why it includes demand/time window/service time data.
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Another way to go about this:
- First write down the problem formulation of the most important vehicle routing problems
- Then define a rich vehicle routing problem formulation that captures all these characteristics
- Then define a VRPLIB format that captures all of this
- Also think about generalization: can we include attributes that are not included?
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https://github.com/jump-dev/MathOptFormat
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- Document empty route data option
Route #1: 1 2 3
Route #2:
Route #3:
is allowed
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Related Issues (20)
- Check if TSPLIB95 can be read
- Optional distance computation for large instances
- Ignore -1 in depot section HOT 1
- Specify instance and solution formats in README
- Supersede TSPLIB HOT 1
- Prize-collecting and benchmark instances HOT 5
- Validate instance and solution data
- UnicodeDecodeError when reading SINTEF solution file HOT 2
- Raise warning when empty instance/solution
- Line comments HOT 4
- Distance Matrix Rounding HOT 4
- Deprecate downloading instances
- Ragged arrays
- Extend VRPLIB format with arc list
- Handle rounding conventions HOT 1
- VRPLIB v2 HOT 2
- Reindex sections based on indices
- Parse large instances with 15K or 30K nodes HOT 1
- Ordering issue in VRPLIB files
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