Rabit Library
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This folder holds the library file generated by the compiler. To generate the library file, type ```make``` in the project root folder. If you want mpi compatible library, type ```make mpi```

***List of Files***
* rabit.a The rabit package library
  - Normally you need to link with this one
* rabit_mock.a The rabit package library with mock test
  - This library allows additional mock-test
* rabit_mpi.a The MPI backed library
  - Link against this library makes the program use MPI Allreduce
  - This library is not fault-tolerant
* rabit_empty.a Dummy package implementation
  - This is an empty library that does not provide anything
  - Only introduced to minimize code dependency for projects that only need single machine code