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Update kde.py #23

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Update kde.py #23

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986f01b
Update kde.py
ducha-aiki Feb 23, 2024
6af2253
fix?
Parskatt Feb 24, 2024
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7 changes: 5 additions & 2 deletions roma/utils/kde.py
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Original file line number Diff line number Diff line change
Expand Up @@ -10,10 +10,13 @@ def kde(x, std = 0.1):

def approx_kde(x, std = 0.1, max_num_cmp = 20_000):
# use a gaussian kernel to estimate density
if len(x.shape) > 2:
if len(x.shape) != 2:
raise ValueError(f"Needs shape N, D got shape {x.shape}")
x = x.half() # Do it in half precision TODO: remove hardcoding
y = torch.multinomial(x, min(max_num_cmp,len(x.shape[-2])), replacement=False)
inds = torch.multinomial(torch.ones_like(x[:,0]), min(max_num_cmp, x.shape[-2]), replacement=False)
y = x[inds]
scores = (-torch.cdist(x,y)**2/(2*std**2)).exp()
density = scores.sum(dim=-1)
return density