README.md

New benchmark instances for the multi-depot heterogeneous dial-a-ride problem (MDHDARP)

Instances proposed by Malheiros et al. (2021).

The instances were created considering only the characteristics of group I proposed by Parragh (2011) and Braekers et al. (2014). The new dataset containing 24 instances ranging from 9 to 16 vehicles, and 72 to 192 requests.

Instance names

The name of each instance follow the format below: "a" + number_of_vehicles + "-" + number_of_requests + "hetIUY.txt"

Example:

a10-100hetIUY.txt: number_of_vehicles = 10 and number_of_requests = 100

Instance format

number_of_vehicles number_of_requests

• For each vehicle:

route_duration capacity_resource_1 capacity_resource_2 capacity_resource_3 capacity_resource_4

• Dummy vertex

id x_coord y_coord service_time max_ride_time demand_resource_1 demand_resource_2 demand_resource_3 demand_resource_4 earliest_tw latest_tw

• For each pickup vertex:

id x_coord y_coord service_time max_ride_time demand_resource_1 demand_resource_2 demand_resource_3 demand_resource_4 earliest_tw latest_tw

• For each delivery vertex:

id x_coord y_coord service_time max_ride_time demand_resource_1 demand_resource_2 demand_resource_3 demand_resource_4 earliest_tw latest_tw

• Dummy vertex

id x_coord y_coord service_time max_ride_time demand_resource_1 demand_resource_2 demand_resource_3 demand_resource_4 earliest_tw latest_tw

Extra information

• Coordinates ranging from -10 to 10
• For a given request, its pickup and delivery vertices are paired as follows: pickup_id, pickup_id + number_of_requests
• For each request and each resource pickup_demand + delivery_demand = 0
• For each request, max_ride_time = 30, the maximum ride time of a request is set at its pickup vertex
• For each request, service_time = 3
• Each demand ranging from -1 to 1
• Dummy vertices can be used as depot for heterogeneous dial-a-ride problem (HDARP)