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Hi Junyuan Zheng Thanks for your feedback. I edited my page to address your concerns. I provided a layman's explanation after that dirichlet description. Also please note understanding dirichlet is not necessary to understand the concept of LDA. So i restricted myslef to give a full fledged description of all notations. However i kept to bare minimum so that the interested user may play with it to see how choices of different parameter inside dirichlet can affect the final outcome of LDA. hence i just mentioned the mathematical distribution that dirichlet use, without going into a detalied description of it

best, Prithu