number of images per character

[chenyafe052]

according this example:
X.shape
(964, 20, 105, 105)

"This means we have 964 characters (or letters or categories) spanning across 30 different alphabets. For each of this character, we have 20 images, and each image is a gray scale image of resolution 105x105. Hence the shape (964, 20, 105, 105)."

Does the number of images per character have to be the same? (20 in this case)