create_grids_and_save_as_gif_animation.py

# grids = [create_grid(generated_batch[j]) for j in range(len(generated_batch))]
# save_as_gif_animation(grids, output_animation_path)

import math

import numpy as np
from PIL import Image

def create_grid(image_arrays: np.ndarray):
    batch_size = image_arrays.shape[0]
    image_height = image_arrays.shape[1]
    image_width = image_arrays.shape[2]
    n_channels = image_arrays.shape[3]

    n_cols = n_rows = math.ceil(batch_size**0.5)
    n_samples = min(n_rows * n_cols, batch_size)

    canvas_height = image_height * n_rows
    canvas_width = image_width * n_cols

    canvas = np.zeros((canvas_height, canvas_width, n_channels))

    for i in range(n_samples):
        row = i // n_cols
        col = i % n_rows
        canvas[
            row * image_height : (row + 1) * image_height,
            col * image_width : (col + 1) * image_width,
            :,
        ] = image_arrays[i]

    return canvas


def save_as_gif_animation(images, file_path):
    channels = images.shape[-1]
    if channels == 1:
        images = [img.squeeze() for img in images]

    Image.fromarray(images[0]).save(
        file_path,
        save_all=True,
        duration=10,
        append_images=[Image.fromarray(arr) for arr in images[1:]],
        loop=1,
    )