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Fix #1855: LocalResponseNorm +/-Inf when k=alpha=0 #76

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Fix #1855: LocalResponseNorm +/-Inf when k=alpha=0 #76

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8 changes: 8 additions & 0 deletions torch/nn/modules/normalization.py
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Original file line number Diff line number Diff line change
Expand Up @@ -57,6 +57,14 @@ def __init__(
self.alpha = alpha
self.beta = beta
self.k = k
if k <= 0 and alpha <= 0 and beta != 0:
raise ValueError(
f"LocalResponseNorm: k and alpha cannot both be non-positive "
f"when beta is non-zero; "
f"got k={k}, alpha={alpha}, beta={beta}. "
f"The denominator k + (alpha/size) * sum(x^2) would collapse to zero "
f"and 0^(-beta) = inf."
)

def forward(self, input: Tensor) -> Tensor:
"""
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