Web能使用机器学习算法模型的业务场景还是很少的,而且检验成本高,一般是建模比赛或者是其他相关赛事才能用到机器学习模型,而且衡量模型质量检测也是个问题。我们在学习阶段比较难应用到部分算法而且仅参照书本上少数例子很容易遗忘,在网上搜索有关机器学习算法练习的时候发现牛客正好 ... Web3 Answers Sorted by: 3 if currentLabel not in labelCounts.keys (): labelCounts [currentLabel] = 0 labelCounts [currentLabel] += 1 is error. It's probably badly indented and should be: if currentLabel not in labelCounts.keys (): labelCounts [currentLabel] = 0 labelCounts [currentLabel] += 1 You can't have "empty" if in Python.
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Weblooks like you need an indent, your code should be generating the key if it doesn't exist then it increments a counter on that key, += should not be indented to account for keys that … WeblabelCounts [currentLabel]= 0 labelCounts [currentLabel] + = 1 # احسب عدد الفصول الدراسية وعدد كل فصل shannonEnt= 0 for key in labelCounts: prob = float (labelCounts [key]) / numEntries # احسب قيمة الكون لفئة واحدة shannonEnt- = prob * log (prob، 2) # تراكم قيمة الكون لكل فئة return shannonEnt def createDataSet1 (): # إنشاء بيانات نموذجية WeblabelCounts [currentLabel] = 0 labelCounts [currentLabel] += 1 shannonEnt = 0.0 for key in labelCounts: # print (key) # La iteración es la clave del diccionario. prob = float (labelCounts [key])/m shannonEnt -= prob * log (prob,2) return shannonEnt stellant systems inc torrance