Mermaid Sample

graph LR

	A[Introduction]
	B[Usecases]
	C[Physics]
	D[Sports]

A-->B-->C-->D

click A "/courses/bigdata2020/#introduction-to-ai-driven-digital-transformation" _blank
click B "/courses/bigdata2020/#big-data-usecases-survey" _blank
click C "/courses/bigdata2020/#physics" _blank
click D "/courses/bigdata2020/#sports" _blank

gantt
    title Class Calendar
    dateFormat  YYYY-MM-DD
    section Lectures
    Overview         :w1, 2020-08-28, 7d
    Introduction     :w2, 2020-09-04, 7d 
    Physics          :w3, 2020-09-11, 7d 
    Sport            :w4, 2020-09-18, 7d
    section Practice
	Colab            :after w1, 14d
    Github           :after w2, 7d	

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