a batch of sample images and save it as a grid:


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>>> from diffusers import DDPMPipeline
>>> import math
>>> import os


>>> def make_grid(images, rows, cols):
...     w, h = images[0].size
...     grid = Image.new("RGB", size=(cols * w, rows * h))
...     for i, image in enumerate(images):
...         grid.paste(image, box=(i % cols * w, i // cols * h))
...     return grid


>>> def evaluate(config, epoch, pipeline):
...     # Sample s