Created
          April 17, 2020 13:47 
        
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    From "Programming Machine Learning": gradient calculation with multiple input variables
  
        
  
    
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  | # The gradient with multile input variables | |
| def gradient(X, Y, w): | |
| return 2 * np.matmul(X.T, (predict(X, w) - Y)) / X.shape[0] | 
  
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