python - tfrecord how to get classes and their count

Question

I have image array shape 2x32x32x3, I want to write a function to get hex code and make it a 2x32x32x1 dimension, I tried below code, but do not know how to pass 3 element in 3rd dimension to the function. Thank you.

import numpy as np
arr_tmp = np.random.randint(low=0, high=255, size=[2, 32, 32, 3])

from colormap import rgb2hex
def cov2hex(a, b, c): 
   return rgb2hex(a, b, c)

arr_hex = np.apply_along_axis(cov2hex(?, ?, ?), 3, arr_tmp)

question from:https://stackoverflow.com/questions/65882563/tfrecord-how-to-get-classes-and-their-count

Answer 1

Waitting for answers