how to perform max/mean pooling on a 2d array using numpy

by

You could use scikit-image block_reduce:

import numpy as np
import skimage.measure

a = np.array([
      [  20,  200,   -5,   23],
      [ -13,  134,  119,  100],
      [ 120,   32,   49,   25],
      [-120,   12,    9,   23]
])
skimage.measure.block_reduce(a, (2,2), np.max)

Gives:

array([[200, 119],
       [120,  49]])

More Related Contents:

  1. What are the differences between numpy arrays and matrices? Which one should I use?
  2. numpy matrix vector multiplication [duplicate]
  3. Numpy matrix to array
  4. how does multiplication differ for NumPy Matrix vs Array classes?
  5. Convert a 1D array to a 2D array in numpy
  6. Why does numpy.linalg.solve() offer more precise matrix inversions than numpy.linalg.inv()?
  7. NumPy array/matrix of mixed types
  8. Convert row vector to column vector in NumPy
  9. Numpy select rows based on condition
  10. Is there a NumPy function to return the first index of something in an array?
  11. Understanding NumPy’s einsum
  12. Intuition and idea behind reshaping 4D array to 2D array in NumPy
  13. Is there any numpy group by function?
  14. Computing the correlation coefficient between two multi-dimensional arrays
  15. Removing nan values from an array
  16. Why is numpy’s einsum faster than numpy’s built in functions?
  17. How to return 0 with divide by zero
  18. Reshape an array in NumPy
  19. Most efficient way to forward-fill NaN values in numpy array
  20. NumPy array initialization (fill with identical values)
  21. Why does numpy.zeros takes up little space
  22. Generalise slicing operation in a NumPy array
  23. Efficiently Calculating a Euclidean Distance Matrix Using Numpy
  24. How to split a numpy array in fixed size chunks with and without overlap?
  25. How to find the index of a value in 2d array in Python?
  26. find and delete from more-dimensional numpy array
  27. Initialise numpy array of unknown length
  28. load csv into 2D matrix with numpy for plotting
  29. Cannot understand numpy argpartition output
  30. Convert list of lists with different lengths to a numpy array [duplicate]

Leave a Comment