LPIPS arguments

[liza-liz]

Hello, I am using the lpips in colab environment. With two images, original image and distorted image. I just wanted to know if should I give the orignal image as first argument or as 2nd argument?

lpiqa_metric = pyiqa.create_metric('lpips-vgg+')

.... transform part ....

Calculate LPIPS score
lpips_score = lpiqa_metric(ref_image, orig_image) 

print(f"LPIPS Score: {lpips_score}")

would give me:
LPIPS Score: tensor([[0.5888]])

while,

# Calculate LPIPS score
lpips_score = lpiqa_metric(orig_image, ref_image)

print(f"LPIPS Score: {lpips_score}")

would give me:

LPIPS Score: tensor([[0.5835]])

[chaofengc]

The first image should be the distorted one, while the second should be the pristine (reference) image.
Note that lpips is symmetric. The improved version, denoted with +, is asymmetric.