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llama.cpp
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Refactor estimate_lambda()

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Ed Addario 2025-09-21 13:42:31 +01:00
parent bdefdb673c
commit 6b8cedf3bc
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1 changed files with 9 additions and 10 deletions
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19
src/llama-quant.cpp
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@ -975,30 +975,29 @@ static std::unordered_map<std::string, ggml_type> target_bpw_type(
};
// Returns lambda per slice or 0.0 if no activations
auto estimate_lambda = [&](const float * values, const float * activations, const int64_t n_per_row, const int64_t ne2) -> std::vector<float>
{
std::vector<float> lambdas(std::max<int64_t>(1, ne2), 0.0f);
auto estimate_lambda = [&](const float * values, const float * activations, const int64_t n_per_row, const int64_t ne2) -> std::vector<float> {
const int64_t ns = std::max<int64_t>(1, ne2);
std::vector<float> lambdas(ns, 0.0f);
if (!activations) { return lambdas; }
for (int64_t s = 0; s < std::max<int64_t>(1, ne2); ++s) {
for (int64_t s = 0; s < ns; ++s) {
const float * v = values ? values + s * n_per_row : nullptr;
const float * a = activations + s * n_per_row;
double s1 = 0.0;
double s2 = 0.0;
for (int64_t j = 0; j < n_per_row; ++j) {
const double w = v ? std::max(0.0f, v[j]) : 1.0;
const double aw = std::sqrt(w) * a[j];
const double aw2 = aw * aw;
s1 += aw2;
s2 += aw2 * aw2;
const double aw2 = std::sqrt(w) * a[j];
const double z = aw2 * aw2;
s1 += z;
s2 += z * z;
}
float l = 0.0f;
if (s1 > 0.0) {
const auto n = (double)n_per_row;
const double c = std::max(0.0, s2 / (s1 * s1 + epsilon) - 1.0 / n);
double lambda = 8.0 * (c / (c + 1.0));
l = (float)std::clamp(lambda, 0.0, 12.0);
l = (float) std::clamp(8.0 * (c / (c + 1.0)), 0.0, 12.0);
}
lambdas[(size_t)s] = l;