NameError: name 'aspect_ratio' is not defined

Hi all

NameError Traceback (most recent call last)
in
1 # Draw the RGB image
2 path_out = ‘./eopatches_small/’ if use_smaller_patches else ‘./eopatches_large/’
----> 3 fig = plt.figure(figsize=(20, 20 * aspect_ratio))
4
5 pbar = tqdm(total=9)

NameError: name ‘aspect_ratio’ is not defined

I am getting this error…can anyone please help me…many Thanks in advance