Vehicle Specific Capacities

[daniel-j-h]

At the moment we expose a single vehicleCapacity property. With it users can set the capacities for all their vehicles. What we should do instead is expose a vehicleCapacities property (parallel array coinciding with the vehicles) where the user can specify a capacity on a per vehicle basis.

Related: Heterogeneous Fleets #11

cc @karenzshea

[Abhishekrana254]

Daniel can you help me getting started with code for this issue.
i have ubuntu 16.04 installed

[daniel-j-h]

Sure, here's how to get started on this task:

• Run npm install --build-from-source in this repo. and see if it compiles. Check the readme if you're hitting undefined symbol issues or post back if you're having troubles.
• Get familiar with the code base (you can leave out the tsp* files). Figure out where parameters are parsed, where vector and matrix types come into play and where we interact with the constraint solver.
• You need to change the capacity from a single number to a vector of numbers with as many numbers as vehicles you have (for a capacity for each vehicle). See vrp_params.h here and here - this is where the Javascript -> C++ parsing happens.
• You then need to pass on the vector of capacities to the async. vrp worker here
• In the vrp worker here you need to pass the vector of capacities to the solver using this function
• Add tests here
• Adapt the docs here
• Make a new release, see these docs

Hope that helps - feel free to post back if you need more details or have questions :)

[Abhishekrana254]

hey daniel the work is almost done .. but i m having a tough time debugging . Can you suggest a way to debug nodejs coupled with c++ addons.

[daniel-j-h]

What I can recommend is:

• uncomment this line and install the dependencies again; then you will get a or-tools lib with debug symbols in it, then
• npm install --build-from-source --debug to also build the Node.js bindings with debug symbols enabled

then you should be able to attach a debugger and step through it. I can also recommend you forking this repo. and making a pull request early on so we can have some eyes on it and give you some hints early on.

[Abhishekrana254]

hey man .. sorry to bother you but i have re-cloned the repository and rebuild from source .. but this time it is giving me this error ...
*** Error in `node': munmap_chunk(): invalid pointer: 0x00007f4b71e2ea00 ***
======= Backtrace: =========
/lib/x86_64-linux-gnu/libc.so.6(+0x777e5)[0x7f4b8af2d7e5]
/lib/x86_64-linux-gnu/libc.so.6(cfree+0x1a8)[0x7f4b8af3a698]
node(_ZNSt10_HashtableIiSt4pairIKiiESaIS2_ENSt8__detail10_Select1stESt8equal_toIiESt4hashIiENS4_18_Mod_range_hashingENS4_20_Default_ranged_hashENS4_20_Prime_rehash_policyENS4_17_Hashtable_traitsILb0ELb0ELb1EEEE21_M_insert_unique_nodeEmmPNS4_10_Hash_nodeIS2_Lb0EEE+0x129)[0x1262049]
/home/abhishek/Documents/abhishek-vrp/node-or-tools/lib/binding/node_or_tools.node(ZNSt10_HashtableIiSt4pairIKiiESaIS2_ENSt8__detail10_Select1stESt8equal_toIiESt4hashIiENS4_18_Mod_range_hashingENS4_20_Default_ranged_hashENS4_20_Prime_rehash_policyENS4_17_Hashtable_traitsILb0ELb0ELb1EEEE10_M_emplaceIJS2_EEES0_INS4_14_Node_iteratorIS2_Lb0ELb0EEEbESt17integral_constantIbLb1EEDpOT+0x9f)[0x7f4b739215ff]
/home/abhishek/Documents/abhishek-vrp/node-or-tools/lib/binding/node_or_tools.node(_ZN19operations_research21RoutingModelInspector13EndVisitModelERKSs+0x8d)[0x7f4b7391eabd]
/home/abhishek/Documents/abhishek-vrp/node-or-tools/lib/binding/node_or_tools.node(_ZNK19operations_research6Solver6AcceptEPNS_12ModelVisitorE+0x1f)[0x7f4b73970c5f]
/home/abhishek/Documents/abhishek-vrp/node-or-tools/lib/binding/node_or_tools.node(_ZN19operations_research12RoutingModel24CloseModelWithParametersERKNS_23RoutingSearchParametersE+0xc40)[0x7f4b739083b0]
/home/abhishek/Documents/abhishek-vrp/node-or-tools/lib/binding/node_or_tools.node(_ZN19operations_research12RoutingModel10CloseModelEv+0x22)[0x7f4b73907742]
/home/abhishek/Documents/abhishek-vrp/node-or-tools/lib/binding/node_or_tools.node(_ZN9VRPWorker7ExecuteEv+0x518)[0x7f4b738d3dec]
/home/abhishek/Documents/abhishek-vrp/node-or-tools/lib/binding/node_or_tools.node(_ZN3Nan12AsyncExecuteEP9uv_work_s+0x2e)[0x7f4b738c9d3d]
node[0x131a881]
node[0x13299b9]
/lib/x86_64-linux-gnu/libpthread.so.0(+0x76ba)[0x7f4b8b2876ba]
/lib/x86_64-linux-gnu/libc.so.6(clone+0x6d)[0x7f4b8afbd3dd]
======= Memory map: ========
00400000-01bf5000 r-xp 00000000 08:03 1192648 /home/abhishek/.nvm/versions/node/v6.10.3/bin/node
01df4000-01e0d000 rw-p 017f4000 08:03 1192648 /home/abhishek/.nvm/versions/node/v6.10.3/bin/node
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3c50a0c00000-3c50a0cf5000 rw-p 00000000 00:00 0
7f4b6c000000-7f4b6c026000 rw-p 00000000 00:00 0
7f4b6c026000-7f4b70000000 ---p 00000000 00:00 0
7f4b7162f000-7f4b71630000 ---p 00000000 00:00 0
7f4b71630000-7f4b71e30000 rw-p 00000000 00:00 0
7f4b71e30000-7f4b71e31000 ---p 00000000 00:00 0
7f4b71e31000-7f4b72631000 rw-p 00000000 00:00 0
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7f4b72e33000-7f4b73633000 rw-p 00000000 00:00 0
7f4b73633000-7f4b73dce000 r-xp 00000000 08:03 2666046 /home/abhishek/Documents/abhishek-vrp/node-or-tools/lib/binding/node_or_tools.node
7f4b73dce000-7f4b73fcd000 ---p 0079b000 08:03 2666046 /home/abhishek/Documents/abhishek-vrp/node-or-tools/lib/binding/node_or_tools.node
7f4b73fcd000-7f4b73fff000 r--p 0079a000 08:03 2666046 /home/abhishek/Documents/abhishek-vrp/node-or-tools/lib/binding/node_or_tools.node
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7f4b74000000-7f4b74103000 rw-p 00000000 00:00 0
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7f4b7c000000-7f4b7c09b000 rw-p 00000000 00:00 0
7f4b7c09b000-7f4b80000000 ---p 00000000 00:00 0
7f4b80000000-7f4b80072000 rw-p 00000000 00:00 0
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7f4b88497000-7f4b884b0000 r-xp 00000000 08:03 5771765 /lib/x86_64-linux-gnu/libz.so.1.2.8
7f4b884b0000-7f4b886af000 ---p 00019000 08:03 5771765 /lib/x86_64-linux-gnu/libz.so.1.2.8
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7f4b8b27c000-7f4b8b280000 rw-p 00000000 00:00 0
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7f4b8c148000-7f4b8c149000 r--p 00002000 08:03 5771879 /lib/x86_64-linux-gnu/libdl-2.23.so
7f4b8c149000-7f4b8c14a000 rw-p 00003000 08:03 5771879 /lib/x86_64-linux-gnu/libdl-2.23.so
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7f4b8c371000-7f4b8c372000 rw-p 00000000 00:00 0
7ffc2e0a1000-7ffc2e0c4000 rw-p 00000000 00:00 0 [stack]
7ffc2e1b3000-7ffc2e1b5000 r--p 00000000 00:00 0 [vvar]
7ffc2e1b5000-7ffc2e1b7000 r-xp 00000000 00:00 0 [vdso]
ffffffffff600000-ffffffffff601000 r-xp 00000000 00:00 0 [vsyscall]
Aborted (core dumped)

could you check if it is giving you the same error or is it just on my system?

[daniel-j-h]

Can you give us some more details - how did you build the bindings, what's the compiler and stdlib you are using, which operating system and distribution are you on etc.

[Abhishekrana254]

I first checked the install script whether it is as u mentioned ... the i ran the command npm install ...and then
npm install --build-from-source --debug as u mentioned and it is giving me above error in building.
i am using ubuntu 16.04 LTS , and i have gcc version 5.4.0 20160609 installed.

[daniel-j-h]

Can you commit your work on a branch and then push it - I can't help you much without being able to reproduce it locally or have a look at what's going on.

[Abhishekrana254]

Never mind daniel, that was sorted ... but there was one thing that was bothering me ... i am confused about the demands matrix as what does it means ... according to me if it was a demand array it would more clear to me as demand[i] at node i. I tried thinking like the vehicle carrying the load from a node to another node might change due to pickups . But they are all assinged to 1 except from depot, which also doesnt make sense to me ... please help... and i ll soon commit the work on a branch .. sorry i was occupied somewhere.

[daniel-j-h]

Check the docs in API.md - it's 2-dimensional for future features - not used right now. Set the second dimension to a constant value.

[Abhishekrana254]

hey daniel hi, today i created a pull request .. it failed in travis build ... It is working in my system .

[abhishek-rana-quifers]

hey hi daniel, i had one query, Right now .. the node-or-tools is capable of deploying one order to exactly one location and only one vehicle carrying ... i want it .. to be able to take multiple orders at a given location, and with the given vehicles they can be delivered to the same location via one vehicle or more depending upon the constraints .Can this be possible, using the or-tools, i really need you advice on this to move forward.

[daniel-j-h]

You should be able to use multiple vehicles and then use the pickup and delivery feature to specify delivery and pickup constraints. If you want multiple vehicles to serve the same location you can add artificial locations internally and then collapse them again after you get the solution.

[carlosen14]

What was about this?

[dcoellarb]

Hi, was wondering if this feature is supported, i don't see the new vehicleCapacities property in the documentation