[mlpack] Particle swarm optimization for GSOC-19

[sangyunxin]

Dear all,
My name is Sang Yunxin, and I am a senior student from Whuhan University, China. I want to participate in GSoC 2019 and take part in establishing "Particle swarm optimization". 
According to my understanding of this idea and previous discussions about this project, I will work to provide a PSO optimizer which works for both unconstrained and constrained problems to complement mlpack optimizer API —— ensmallen. Do I have a correct understanding for this project? 
Thank you, and I look forward to hearing from you.
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