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llama.cpp
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Finetune heuristics

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Ed Addario 2025-10-20 20:52:23 +01:00
parent 41a0069613
commit fa1df81d49
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1 changed files with 25 additions and 26 deletions
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51
src/llama-quant.cpp
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@ -1577,13 +1577,9 @@ static std::unordered_map<std::string, ggml_type> target_bpw_type(
float depth_score = 0.0f;
float type_score = 0.0f;
// Depth component: output, embeddings & early/late layers are important
if (name.find("output.weight") != std::string::npos ||
name.find("token_embd.weight") != std::string::npos) {
// Depth component: output & early/late layers are important
if (name == "output.weight") {
depth_score = 1.0f;
}
else if (name.find(".attn_output.weight") != std::string::npos) {
depth_score = 0.9f;
} else {
static const std::regex layer_pattern(R"(blk\.(\d+)\.)");
std::smatch match;
@ -1591,38 +1587,40 @@ static std::unordered_map<std::string, ggml_type> target_bpw_type(
const int layer = std::stoi(match[1]);
const float normalized_layer = (float)layer / (float)std::max(1, (int)model.hparams.n_layer - 1);
const float center_dist = std::abs(normalized_layer - 0.5f) * 2.0f;
depth_score = 0.2f + 0.6f * center_dist;
depth_score = 0.9f * center_dist;
}
}
// Type component: certain tensor types are more important
if (name.find("output.weight") != std::string::npos) {
// Type component: certain tensor types have more impact on model quality
if (name == "output.weight") {
type_score = 1.0f;
} else if (name.find(".attn_output.weight") != std::string::npos) {
type_score = 0.9f;
} else if (name.find(".ffn_down.weight") != std::string::npos ||
name.find(".ffn_down_shexp.weight") != std::string::npos ||
name.find(".ffn_down_exps.weight") != std::string::npos) {
type_score = 0.9f;
} else if (name.find(".attn_output.weight") != std::string::npos ||
name.find(".time_mix_output.weight") != std::string::npos ||
name.find(".attn_o.weight") != std::string::npos) {
type_score = 0.8f;
} else if (name.find(".ffn_up.weight") != std::string::npos ||
name.find(".ffn_gate.weight") != std::string::npos ||
name.find(".ffn_up_exps.weight") != std::string::npos ||
name.find(".ffn_gate_exps.weight") != std::string::npos) {
type_score = 0.3f;
} else if (name.find(".attn_q.weight") != std::string::npos ||
name.find(".attn_k.weight") != std::string::npos ||
name.find(".attn_v.weight") != std::string::npos ||
name.find(".attn_qkv.weight") != std::string::npos) {
type_score = 0.7f;
} else if (name.find(".ffn_up.weight") != std::string::npos ||
name.find(".ffn_gate.weight") != std::string::npos ||
name.find(".ffn_up_shexp.weight") != std::string::npos ||
name.find(".ffn_gate_shexp.weight") != std::string::npos ||
name.find(".ffn_up_exps.weight") != std::string::npos ||
name.find(".ffn_gate_exps.weight") != std::string::npos) {
type_score = 0.6f;
type_score = 0.2f;
} else if (name.find("token_embd.weight") != std::string::npos) {
type_score = 0.5f;
type_score = 0.1f;
}
// Weighted combination
total_score = 0.80f * type_score + 0.20f * depth_score; // 80% type + 20% depth
scores[name] = total_score;
total_score = 0.8f * type_score + 0.2f * depth_score; // 80% type + 20% depth
if (total_score != 0.0f) {
scores[name] = total_score;
LLAMA_LOG_DEBUG("\t%s: \t %45s \t depth score %.4f \t type score %.4f \t total score %.4f\n", func, name.c_str(), depth_score, type_score, total_score);
}
}
return scores;
@ -1636,15 +1634,16 @@ static std::unordered_map<std::string, ggml_type> target_bpw_type(
std::sort(sorted_scores.begin(), sorted_scores.end(), [](const auto & a, const auto & b) { return a.second > b.second; });
// Select top percentile
const size_t n_important = std::max<size_t>(1, std::llround((double)sorted_scores.size() * 0.25f)); // top 25%
const size_t n_important = std::max<size_t>(1, std::llround((double)sorted_scores.size() * 0.25f)); // bump top 25%
std::unordered_set<std::string> important;
for (size_t i = 0; i < std::min(n_important, sorted_scores.size()); ++i) {
important.insert(sorted_scores[i].first);
//LLAMA_LOG_DEBUG("\t%s: important tensor %s (score %.4f)\n", func, sorted_scores[i].first.c_str(), sorted_scores[i].second);
LLAMA_LOG_DEBUG("\t%s: important tensor %s (score %.4f)\n", func, sorted_scores[i].first.c_str(), sorted_scores[i].second);
}
LLAMA_LOG_INFO("%s: prioritizing %zu out off %zu tensors\n", func, important.size(), sorted_scores.size());
const auto pct = 100.0 * (double)important.size() / (double)sorted_scores.size();
LLAMA_LOG_INFO("%s: prioritizing %zu out of %zu tensors (%.2f%%)\n", func, important.size(), sorted_scores.size(), pct);
return important;
};