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Fixed bug with invertibility of AffineHalfFlow #1

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Fixed bug with invertibility of AffineHalfFlow #1

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8 changes: 6 additions & 2 deletions nflib/flows.py
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Original file line number Diff line number Diff line change
Expand Up @@ -114,7 +114,9 @@ def forward(self, x):
z1 = torch.exp(s) * x1 + t # transform this half as a function of the other
if self.parity:
z0, z1 = z1, z0
z = torch.cat([z0, z1], dim=1)
z = torch.zeros((x.shape[0], self.dim))
z[:,::2] = z0
z[:,1::2] = z1
log_det = torch.sum(s, dim=1)
return z, log_det

Expand All @@ -128,7 +130,9 @@ def backward(self, z):
x1 = (z1 - t) * torch.exp(-s) # reverse the transform on this half
if self.parity:
x0, x1 = x1, x0
x = torch.cat([x0, x1], dim=1)
x = torch.zeros((z.shape[0], self.dim))
x[:,::2] = x0
x[:,1::2] = x1
log_det = torch.sum(-s, dim=1)
return x, log_det

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