Andrew Ng Course Ex3: What is one-vs-all logistic regression?

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Ex3: https://github.com/jinzishuai/learn2deeplearn/blob/master/AndrewNg_ML_Courera/machine-learning-ex3/ex3.pdf

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Ref:

• https://github.com/jinzishuai/learn2deeplearn/blob/master/AndrewNg_ML_Courera/lectureNotes/Lecture8_NN.pdf
• https://www.coursera.org/learn/machine-learning/lecture/68Pol/multiclass-classification-one-vs-all

one-vs-all: multi-class classification problem