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[Python Cookbook] Numpy: How to Apply a Function to 1D Slices along the Given Axis

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Here is a function in Numpy module which could apply a function to 1D slices along the Given Axis. It works like apply funciton in Pandas.

 

numpy.apply_along_axis(func1d, axis, arr, *args, **kwargs)

 

Parameters:
func1d : function (M,) -> (Nj…)

This function should accept 1-D arrays. It is applied to 1-D slices of arr along the specified axis.

axis : integer

Axis along which arr is sliced. (axis = 1: along the row; axis = 0: along the column)

arr : ndarray (Ni…, M, Nk…)

Input array.

args : any

Additional arguments to func1d.

kwargs : any

Additional named arguments to func1d.

New in version 1.9.0.
Returns:
out : ndarray (Ni…, Nj…, Nk…)

The output array. The shape of out is identical to the shape of arr, except along the axisdimension. This axis is removed, and replaced with new dimensions equal to the shape of the return value of func1d. So if func1d returns a scalar out will have one fewer dimensions than arr.

Here is an example to shift the image one pixel down through numpy.apply_along_axis method.

1 import numpy as np
2 from scipy.ndimage.interpolation import shift
3 def shift_one_pixel(image, dx,dy):
4     image=image.reshape(28,28)
5     image_shifted=shift(image,[dy,dx],cval=0,mode='constant')
6     return image_shifted.reshape(28*28)
7 
8 X_train_expanded = np.apply_along_axis(shift_one_pixel,1,X_train,1,0)

 

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