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[tmva][sofie] Improved std::tanh with exponential formula #19740

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[tmva][sofie] Improved std::tanh with exponential formula #19740

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6 changes: 4 additions & 2 deletions tmva/sofie/inc/TMVA/ROperator_Tanh.hxx
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Original file line number Diff line number Diff line change
Expand Up @@ -57,8 +57,10 @@ public:
std::stringstream out;
size_t length = ConvertShapeToLength(fShape);
out << "\n//------ TANH\n";
out << SP << "for (int id = 0; id < " << length << " ; id++){\n";
out << SP << SP << "tensor_" << fNY << "[id] = std::tanh(tensor_" << fNX << "[id]);\n";
out << SP << "for (size_t id = 0; id < " << length << " ; id++){\n";
out << SP << SP << "auto x = tensor_" << fNX << "[id];\n";
out << SP << SP << "auto exp2x = std::exp(2.0f * x);\n";
out << SP << SP << "tensor_" << fNY << "[id] = (exp2x - 1.0f) / (exp2x + 1.0f);\n";
out << SP << "}\n";
return out.str();
}
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