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uml diagrams data science pandas se requirement gathering model requirement elicitation ppt in requirement model requirement model in se software engineering linear discriminant analysis principal component analysis lda pca dimensionality reduction numpy clustering artificial neural networks int neural networks nn pridiction data processing visual data mining geospacial data analysis data visualization geospatial visualization graph theory concepts graph theory ppt graph theory graph ppt usecase diagram uml usecase diagram se roger pressman ppt se software engineering roger software engineering roger pre ann