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Remove unnecessary numpy dependency, replace math.exp w/ torch.exp #12

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Remove unnecessary numpy dependency, replace math.exp w/ torch.exp #12

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5 changes: 2 additions & 3 deletions pytorch_ssim/__init__.py
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Original file line number Diff line number Diff line change
@@ -1,11 +1,10 @@
import torch
import torch.nn.functional as F
from torch.autograd import Variable
import numpy as np
from math import exp

def gaussian(window_size, sigma):
gauss = torch.Tensor([exp(-(x - window_size//2)**2/float(2*sigma**2)) for x in range(window_size)])
gauss = torch.exp(torch.tensor(
[-(x - window_size//2)**2/float(2*sigma**2) for x in range(window_size)]))
return gauss/gauss.sum()

def create_window(window_size, channel):
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