Topic Model - Latent Dirichlet Allocation (LDA)
LDA Intuition: 문서는 여러개의 주제들을 동반하고 있다.
LDA Goal & Task
LDA Fact
LDA 그래프 모델
LDA Posterior Computation → Approximation: Inference
Topic Model Inference
LDA Inference Algorithm: 2 Categories
Tools Implementing LDA
Implementing LDA in R Program
Data Collection: ‘rvest’
Pre-Process: ‘tm’ (1) Clean (2) Corpus & DTM
Model Fit: ‘topicmodels’
Plot ggplot: Spot Log-Likelihood Values
Result: 70 topics with 20 Keywords
Visualization: ‘LDAvis’ Example: Interpretation with 5 Topics
References