【笔记2】推荐算法中的数据格式

#数据格式：json数据（用户、商品、打分）
json_txt = '''{"Angelica": {"Blues Traveler": 3.5, "Broken Bells": 2.0,
                      "Norah Jones": 4.5, "Phoenix": 5.0,
                      "Slightly Stoopid": 1.5,
                      "The Strokes": 2.5, "Vampire Weekend": 2.0},
         
         "Bill":{"Blues Traveler": 2.0, "Broken Bells": 3.5,
                 "Deadmau5": 4.0, "Phoenix": 2.0,
                 "Slightly Stoopid": 3.5, "Vampire Weekend": 3.0},
         
         "Chan": {"Blues Traveler": 5.0, "Broken Bells": 1.0,
                  "Deadmau5": 1.0, "Norah Jones": 3.0, "Phoenix": 5,
                  "Slightly Stoopid": 1.0},
         
         "Dan": {"Blues Traveler": 3.0, "Broken Bells": 4.0,
                 "Deadmau5": 4.5, "Phoenix": 3.0,
                 "Slightly Stoopid": 4.5, "The Strokes": 4.0,
                 "Vampire Weekend": 2.0},
         
         "Hailey": {"Broken Bells": 4.0, "Deadmau5": 1.0,
                    "Norah Jones": 4.0, "The Strokes": 4.0,
                    "Vampire Weekend": 1.0},
         
         "Jordyn":  {"Broken Bells": 4.5, "Deadmau5": 4.0,
                     "Norah Jones": 5.0, "Phoenix": 5.0,
                     "Slightly Stoopid": 4.5, "The Strokes": 4.0,
                     "Vampire Weekend": 4.0},
         
         "Sam": {"Blues Traveler": 5.0, "Broken Bells": 2.0,
                 "Norah Jones": 3.0, "Phoenix": 5.0,
                 "Slightly Stoopid": 4.0, "The Strokes": 5.0},
         
         "Veronica": {"Blues Traveler": 3.0, "Norah Jones": 5.0,
                      "Phoenix": 4.0, "Slightly Stoopid": 2.5,
                      "The Strokes": 3.0}
}'''

#数据格式：矩阵（用户-商品）（适用于小数据量）
csv_txt = '''"user","Blues Traveler","Broken Bells","Deadmau5","Norah Jones","Phoenix","Slightly Stoopid","The Strokes","Vampire Weekend"
"Angelica",3.5,2.0,,4.5,5.0,1.5,2.5,2.0
"Bill",2.0,3.5,4.0,,2.0,3.5,,3.0
"Chan",5.0,1.0,1.0,3.0,5,1.0,,
"Dan",3.0,4.0,4.5,,3.0,4.5,4.0,2.0
"Hailey",,4.0,1.0,4.0,,,4.0,1.0
"Jordyn",,4.5,4.0,5.0,5.0,4.5,4.0,4.0
"Sam",5.0,2.0,,3.0,5.0,4.0,5.0,
"Veronica",3.0,,,5.0,4.0,2.5,3.0,'''

#数据格式：条目（用户、商品、打分）（避免巨型稀疏矩阵）
csv_txt = '''"Angelica","Blues Traveler",3.5
"Angelica","Broken Bells",2.0
"Angelica","Norah Jones",4.5
"Angelica","Phoenix",5.0
"Angelica","Slightly Stoopid",1.5
"Angelica","The Strokes",2.5
"Angelica","Vampire Weekend",2.0
"Bill","Blues Traveler",2.0
"Bill","Broken Bells",3.5
"Bill","Deadmau5",4.0
"Bill","Phoenix",2.0
"Bill","Slightly Stoopid",3.5
"Bill","Vampire Weekend",3.0
"Chan","Blues Traveler",5.0
"Chan","Broken Bells",1.0
"Chan","Deadmau5",1.0
"Chan","Norah Jones",3.0
"Chan","Phoenix",5,
"Chan","Slightly Stoopid",1.0
"Dan","Blues Traveler",3.0
"Dan","Broken Bells",4.0
"Dan","Deadmau5",4.5
"Dan","Phoenix",3.0
"Dan","Slightly Stoopid",4.5
"Dan","The Strokes",4.0
"Dan","Vampire Weekend",2.0
"Hailey","Broken Bells",4.0
"Hailey","Deadmau5",1.0
"Hailey","Norah Jones",4.0
"Hailey","The Strokes",4.0
"Hailey","Vampire Weekend",1.0
"Jordyn","Broken Bells",4.5
"Jordyn","Deadmau5",4.0
"Jordyn","Norah Jones",5.0
"Jordyn","Phoenix",5.0
"Jordyn","Slightly Stoopid",4.5
"Jordyn","The Strokes",4.0
"Jordyn","Vampire Weekend",4.0
"Sam","Blues Traveler",5.0
"Sam","Broken Bells",2.0
"Sam","Norah Jones",3.0
"Sam","Phoenix",5.0
"Sam","Slightly Stoopid",4.0
"Sam","The Strokes",5.0
"Veronica","Blues Traveler",3.0
"Veronica","Norah Jones",5.0
"Veronica","Phoenix",4.0
"Veronica","Slightly Stoopid",2.5
"Veronica","The Strokes",3.0'''