Thoi duoc, tat ca cac model du doan (predictive models) deu trong co ve on, nhung lam cach nao chung ta co the xay dung cac model mot cach dang tin cay hon? Day chinh la cau hoi toi thuong duoc hoi boi cac nha khoa hoc du lieu o nhung muc do kinh nghiem khac nhau. Cau hoi co ve don gian, nhung dong thoi cung rat thach thuc boi vi co rat nhieu luong quan diem va moi quan tam khac nhau tu nhung nguoi lien quan. Nhung nguoi xay dung model thuong tap trung vao viec huan luyen model (training model) mot cach tu dong, kiem soat hieu nang, debug va nhung hoat dong duy tri ca he thong tu du lieu den toi uu hieu nang phan cung va cai tien model (MLOps). Nguoi su dung model phan nhieu thuong hung thu hon voi nhung cau hoi ve tu dau ma model cho ra ket qua du doan nhu vay (explainability) hoac nhung doi hoi nhat dinh de hieu duoc ben trong model hoat dong nhu the nao (transparency) va muc do phong thu (security) cua mo hinh truoc nhung tan cong, vi du nhu tu du lieu kem chat luong. Ve phia xa hoi, nhung moi quan tam thuong la model co cong bang hay thien vi (fairness hay bias), vi du mo hinh co uu tien cho mot nhom nguoi nho trong xa hoi, hoac thien vi ve gioi tinh khong; hay ket qua du doan tu model co phu hop chuan muc dao duc hay khong (ethics). Quyen sach nay tong hoa tat ca cac goc nhin tren. Ban doc se tim thay nhung ki thuat machine learning chon loc va ca nhung cach hieu truc quan ngan gon. Cac ki thuat deu duoc gan lien voi cac doan code trong ngon ngu R. Ban doc se cung hai nhan vat Beta va Bit di dao vao khu vuon, khong phai cua ki hoa di thao, ma la cua cac model ML thu vi. Trong khu vuon co ngon den duoc thap len boi nhung goc nhin thau dao ve model tu kinh nghiem thuc te. Cuoc ban luan giua Beta va Bit cung chinh la nhung gi dien ra trong thuc te ma cac nha khoa hoc du lieu thuong gap, co nen thu mot model khac khong, hoac co nen thu mot ki thuat khac de khai pha du lieu, hoac mot tap du lieu khac chang? — va ti ti cau hoi nhu lam cach nao de so sanh giua nhung model hoac lam the nao de kiem tra hieu nang. Qua trinh phat trien model doi hoi su can than va trach nhiem, nhung rat thu vi. Thong thuong, nhieu quyen sach chi chu tam vao mat kien thuc ma quen mat di niem vui va su thu vi. Nhung, hi vong o quyen sach nay, chung ta se co duoc ca hai.