Update XGBoost 1.4.2

[vaaaaanquish]

@davechallis @jonathanstrong Hi.

Overview

• fix: https://github.com/davechallis/rust-xgboost/issues/8
  • upgrade xgboost 1.4.2
  • update bindgen
  • update example

Requires

This PR requires the following merge

• [x] ~https://github.com/davechallis/rust-xgboost/pull/13~
  • Included in this PR
• [ ] https://github.com/davechallis/xgboost/pull/1
• [x] https://github.com/dmlc/xgboost/pull/7265

Confirmed that example/runall.sh is working.

$ head xgboost-sys/xgboost/NEWS.md
XGBoost Change Log
==================

This file records the changes in xgboost library in reverse chronological order.

## v1.4.2 (2021.05.13)

$ ./runall.sh
...
Compiling xgboost-sys v0.2.0 (/app/rust-xgboost/xgboost-sys)
...

Description

• Using CMake because removed build.sh https://github.com/dmlc/xgboost/commit/207f0587111a951f5cd6c609ade001587f242bd1
• XGBoosterPredict's args has been changed
  • https://xgboost.readthedocs.io/en/latest/dev/c__api_8h.html#adc14afaedd5f1add105d18942a4de33c
  • 0 for predict
  • 1 for custom metric training
• remove root_index
  • https://github.com/dmlc/xgboost/pull/5138#discussion_r360838092
• add group_ptr
  • https://github.com/dmlc/xgboost/pull/5187
• demo file to start with 1 index
  • https://github.com/dmlc/xgboost/commit/a894ab6898f5ed525ca7dec89a79ea1fa7f49f5a#diff-b1f466d8b5ac867fc06e6d49115839b7b8428f5c3eb9f7f11488dd677f6f7dbc

[vaaaaanquish]

@davechallis @jonathanstrong Hi.

Please review this PR and https://github.com/davechallis/xgboost/pull/1

I've prepared a Dockerfile to run these.

FROM rust

WORKDIR /app
RUN apt update &&\
    rm -rf ~/.cache &&\
    apt clean all
RUN apt install -y cmake libclang-dev libc++-dev gcc-multilib libssl-dev

RUN git clone --recursive https://github.com/vaaaaanquish/rust-xgboost.git
RUN cd rust-xgboost &&\
    git checkout release_1.4.2 &&\
    cd xgboost-sys/xgboost &&\
    git remote add upstream https://github.com/vaaaaanquish/xgboost.git &&\
    git fetch upstream &&\
    git submodule deinit -f rabit &&\
    git rm -f rabit &&\
    git stash &&\
    git checkout upstream/release_1.4.2 &&\
    cd dmlc-core &&\
    git pull origin master
RUN sed -i -e 's/xgboost-sys.*/xgboost-sys\={path\="\.\/xgboost-sys"}/g' /app/rust-xgboost/Cargo.toml

WORKDIR /app/rust-xgboost
ENTRYPOINT [ "/bin/bash" ]

It works with the following command :)

$ docker build -t example .
$ docker run -it example

# cargo test
# cd examples
# ./runall.sh