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为什么
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heatmap
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PLA
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under fiiting
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numpy
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Transform
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machine learning
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方差
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Training Set
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histogram
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data munging
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step plot
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density plot
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cross validation
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critical value
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covariance matrix
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color
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bubble chart
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bisection
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Product Life Circle
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多分类
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Precision
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Bayes theorem
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统计学术语
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PLC
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bar chart
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pie chart
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bag of words
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练习题
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均衡
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pickle
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Palindrome
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Algorithm
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算法效率
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pair plot
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over fitting
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3d
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Outlier Detection
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（sample size）
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Outlier
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One Hot Encoding
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