Arguments in python fast.ai function that are not in the function definition?












1












$begingroup$


I have been coming across function calls that use arguments that are not in the function definition. I would like to know how that works (i.e. how the compiler interprets this).



For example, this function call:



 interp.plot_confusion_matrix(figsize=(12,12), dpi=60)


uses the variables "figsize" and "dpi", but neither of them turn up in the definition of plot_confusion_matrix: help(interp.plot_confusion_matrix) gives:



plot_confusion_matrix(normalize: bool = False, title: str = 'Confusion matrix', 

cmap: Any = 'Blues', norm_dec: int = 2, slice_size: int = None, **kwargs) -> None 

method of fastai.vision.learner.ClassificationInterpretation instance

    Plot the confusion matrix, with `title` and using `cmap`.


Why is it not an error to use "figsize" and "dpi" in the function call if they are not arguments of the function? How does this work in python?






python jupyter fastai







share|improve this question











$endgroup$

















    1












    $begingroup$


    I have been coming across function calls that use arguments that are not in the function definition. I would like to know how that works (i.e. how the compiler interprets this).



    For example, this function call:



     interp.plot_confusion_matrix(figsize=(12,12), dpi=60)


    uses the variables "figsize" and "dpi", but neither of them turn up in the definition of plot_confusion_matrix: help(interp.plot_confusion_matrix) gives:



    plot_confusion_matrix(normalize: bool = False, title: str = 'Confusion matrix', 
    
cmap: Any = 'Blues', norm_dec: int = 2, slice_size: int = None, **kwargs) -> None 
    
method of fastai.vision.learner.ClassificationInterpretation instance
    
    Plot the confusion matrix, with `title` and using `cmap`.


    Why is it not an error to use "figsize" and "dpi" in the function call if they are not arguments of the function? How does this work in python?






    python jupyter fastai







    share|improve this question











    $endgroup$















      1












      1








      1





      $begingroup$


      I have been coming across function calls that use arguments that are not in the function definition. I would like to know how that works (i.e. how the compiler interprets this).



      For example, this function call:



       interp.plot_confusion_matrix(figsize=(12,12), dpi=60)


      uses the variables "figsize" and "dpi", but neither of them turn up in the definition of plot_confusion_matrix: help(interp.plot_confusion_matrix) gives:



      plot_confusion_matrix(normalize: bool = False, title: str = 'Confusion matrix', 
      
cmap: Any = 'Blues', norm_dec: int = 2, slice_size: int = None, **kwargs) -> None 
      
method of fastai.vision.learner.ClassificationInterpretation instance
      
    Plot the confusion matrix, with `title` and using `cmap`.


      Why is it not an error to use "figsize" and "dpi" in the function call if they are not arguments of the function? How does this work in python?






      python jupyter fastai







      share|improve this question











      $endgroup$




      I have been coming across function calls that use arguments that are not in the function definition. I would like to know how that works (i.e. how the compiler interprets this).



      For example, this function call:



       interp.plot_confusion_matrix(figsize=(12,12), dpi=60)


      uses the variables "figsize" and "dpi", but neither of them turn up in the definition of plot_confusion_matrix: help(interp.plot_confusion_matrix) gives:



      plot_confusion_matrix(normalize: bool = False, title: str = 'Confusion matrix', 
      
cmap: Any = 'Blues', norm_dec: int = 2, slice_size: int = None, **kwargs) -> None 
      
method of fastai.vision.learner.ClassificationInterpretation instance
      
    Plot the confusion matrix, with `title` and using `cmap`.


      Why is it not an error to use "figsize" and "dpi" in the function call if they are not arguments of the function? How does this work in python?






      python jupyter fastai




      python jupyter fastai






      share|improve this question















      share|improve this question













      share|improve this question




      share|improve this question








      edited 20 hours ago









      Davide Fiocco

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      2044










      asked Feb 16 at 13:26









      user637140user637140

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          $begingroup$

          Those parameters are taken care of by **kwargs in the function definition.
          You can look how this is dealt with by the code in the fastai repo and looking for **kwargs in the function definition.

          Some explanations about how this works can be found on SO: https://stackoverflow.com/questions/3394835/use-of-args-and-kwargs.






          share|improve this answer











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            $begingroup$

            Those parameters are taken care of by **kwargs in the function definition.
            You can look how this is dealt with by the code in the fastai repo and looking for **kwargs in the function definition.

            Some explanations about how this works can be found on SO: https://stackoverflow.com/questions/3394835/use-of-args-and-kwargs.






            share|improve this answer











            $endgroup$


















              0












              $begingroup$

              Those parameters are taken care of by **kwargs in the function definition.
              You can look how this is dealt with by the code in the fastai repo and looking for **kwargs in the function definition.

              Some explanations about how this works can be found on SO: https://stackoverflow.com/questions/3394835/use-of-args-and-kwargs.






              share|improve this answer











              $endgroup$
















                0












                0








                0





                $begingroup$

                Those parameters are taken care of by **kwargs in the function definition.
                You can look how this is dealt with by the code in the fastai repo and looking for **kwargs in the function definition.

                Some explanations about how this works can be found on SO: https://stackoverflow.com/questions/3394835/use-of-args-and-kwargs.






                share|improve this answer











                $endgroup$



                Those parameters are taken care of by **kwargs in the function definition.
                You can look how this is dealt with by the code in the fastai repo and looking for **kwargs in the function definition.

                Some explanations about how this works can be found on SO: https://stackoverflow.com/questions/3394835/use-of-args-and-kwargs.







                share|improve this answer














                share|improve this answer



                share|improve this answer








                edited 2 days ago

























                answered 2 days ago









                Davide FioccoDavide Fiocco

                2044




                2044






























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