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bug fix: avoid overflow in softmax Activator #39

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bug fix: avoid overflow in softmax Activator #39

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5 changes: 5 additions & 0 deletions keras_model.cc
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Original file line number Diff line number Diff line change
Expand Up @@ -202,6 +202,11 @@ keras::DataChunk* keras::LayerActivation::compute_output(keras::DataChunk* dc) {
if(y[k] < 0) y[k] = 0;
}
} else if(m_activation_type == "softmax") {
// avoid overflows
auto max_y = *std::max_element(y.begin(), y.end());
for (auto &num : y) {
num -= max_y;
}
float sum = 0.0;
for(unsigned int k = 0; k < y.size(); ++k) {
y[k] = exp(y[k]);
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