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Disable Triton sigmoid focal loss path when gamma == 0 #484

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Disable Triton sigmoid focal loss path when gamma == 0 #484

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4 changes: 4 additions & 0 deletions sam3/train/loss/loss_fns.py
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Original file line number Diff line number Diff line change
Expand Up @@ -149,6 +149,10 @@ def sigmoid_focal_loss(
"""
if not (0 <= alpha <= 1) and triton:
raise RuntimeError(f"Alpha should be in [0,1], got {alpha}")
# The Triton backward path is numerically invalid for gamma == 0 because it
# computes (1 - p_t) ** (gamma - 1), i.e. an inverse power at zero.
if triton and float(gamma) == 0.0:
triton = False
if triton:
if reduce and not loss_on_multimask:
loss = triton_sigmoid_focal_loss_reduce(inputs, targets, alpha, gamma)
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