std::ifstream in(fname, std::ios::binary);

if (!in) {

LOG_ERR("%s: failed to open %s\n", __func__, fname.c_str());

return false;

}

int n_entries;

in.read((char *) &n_entries, sizeof(n_entries));

if (in.fail() || n_entries < 1) {

LOG_ERR("%s: no data in file %s\n", __func__, fname.c_str());

return false;

}

for (int i = 0; i < n_entries; ++i) {

int32_t len = 0;

in.read((char *) &len, sizeof(len));

std::vector<char> name_as_vec(len + 1);

in.read((char *) name_as_vec.data(), len);

if (in.fail()) {

LOG_ERR("%s: failed reading name for entry %d from %s\n", __func__, i + 1, fname.c_str());

return false;

}

name_as_vec[len] = 0;

std::string name{ name_as_vec.data() };

int32_t ncall = 0;

in.read((char *) &ncall, sizeof(ncall));

int32_t nval = 0;

in.read((char *) &nval, sizeof(nval));

if (in.fail() || nval < 1) {

LOG_ERR("%s: failed reading number of values for entry %d\n", __func__, i);

return false;

}

auto & e = imatrix.entries[std::move(name)];

e.sums.resize(nval);

in.read((char *) e.sums.data(), nval * sizeof(float));

if (in.fail()) {

LOG_ERR("%s: failed reading data for entry %d\n", __func__, i);

return false;

}

e.counts.resize(1);

e.counts[0] = ncall;

}

// the trailing data (chunk count + dataset name) is optional

if (in.peek() != EOF) {

int32_t n_calls = 0;

in.read((char *) &n_calls, sizeof(n_calls));

imatrix.chunk_count = n_calls;

if (!in.fail()) {

int32_t len = 0;

in.read((char *) &len, sizeof(len));

if (!in.fail() && len > 0) {

std::vector<char> dataset(len + 1, 0);

in.read(dataset.data(), len);

if (!in.fail()) {

imatrix.datasets.push_back(dataset.data());

}

}

}

}

imatrix.chunk_size = 0;

imatrix.is_legacy = true;

return true;

struct ggml_context * ctx = nullptr;

struct gguf_init_params meta_gguf_params = {

/* .no_alloc = */ false,

/* .ctx = */ &ctx,

};

struct gguf_context * ctx_gguf = gguf_init_from_file(fname.c_str(), meta_gguf_params);

if (!ctx_gguf) {

return common_imatrix_load_legacy(fname, imatrix);

}

const int32_t n_entries = gguf_get_n_tensors(ctx_gguf);

if (n_entries < 1) {

LOG_ERR("%s: no data in file %s\n", __func__, fname.c_str());

gguf_free(ctx_gguf);

ggml_free(ctx);

return false;

}

const int64_t datasets_key = gguf_find_key(ctx_gguf, LLM_KV_IMATRIX_DATASETS);

const int64_t chunk_count_key = gguf_find_key(ctx_gguf, LLM_KV_IMATRIX_CHUNK_COUNT);

const int64_t chunk_size_key = gguf_find_key(ctx_gguf, LLM_KV_IMATRIX_CHUNK_SIZE);

if (datasets_key != -1 && gguf_get_arr_type(ctx_gguf, datasets_key) == GGUF_TYPE_STRING) {

const int64_t n = gguf_get_arr_n(ctx_gguf, datasets_key);

imatrix.datasets.reserve(imatrix.datasets.size() + n);

for (int64_t i = 0; i < n; ++i) {

imatrix.datasets.push_back(gguf_get_arr_str(ctx_gguf, datasets_key, i));

}

}

imatrix.has_metadata = (datasets_key != -1 && chunk_count_key != -1 && chunk_size_key != -1);

imatrix.chunk_count = (chunk_count_key != -1) ? gguf_get_val_u32(ctx_gguf, chunk_count_key) : 0;

imatrix.chunk_size = (chunk_size_key != -1) ? gguf_get_val_u32(ctx_gguf, chunk_size_key) : 0;

const std::string in_sum2_suffix{ ".in_sum2" };

const std::string counts_suffix{ ".counts" };

std::map<std::string, std::pair<struct ggml_tensor *, struct ggml_tensor *>> sums_counts_for;

for (struct ggml_tensor * cur = ggml_get_first_tensor(ctx); cur; cur = ggml_get_next_tensor(ctx, cur)) {

std::string name = cur->name;

if (name.empty()) { continue; }

if (string_remove_suffix(name, in_sum2_suffix)) {

sums_counts_for[std::move(name)].first = cur;

} else if (string_remove_suffix(name, counts_suffix)) {

sums_counts_for[std::move(name)].second = cur;

}

}

for (const auto & sc : sums_counts_for) {

const std::string & name = sc.first;

const struct ggml_tensor * in_sum2 = sc.second.first;

const struct ggml_tensor * counts = sc.second.second;

if (!in_sum2 || !counts) {

LOG_ERR("%s: mismatched sums and counts for %s\n", __func__, name.c_str());

gguf_free(ctx_gguf);

ggml_free(ctx);

return false;

}

auto & e = imatrix.entries[name];

const int64_t nval = ggml_nelements(in_sum2);

const int64_t ncounts = ggml_nelements(counts);

e.sums.resize(nval);

for (int64_t j = 0; j < nval; ++j) {

e.sums[j] = ((const float *) in_sum2->data)[j];

}

e.counts.resize(ncounts);

for (int64_t j = 0; j < ncounts; ++j) {

e.counts[j] = std::lround(((const float *) counts->data)[j]);

}

}

gguf_free(ctx_gguf);

ggml_free(ctx);

return true;