llama : refactor internal quantization functions (ggml-org#5830)

Author: ngxson

llama.cpp

@@ -10836,7 +10836,7 @@ struct quantize_state_internal {
         {}
 };
 
-static void llama_convert_tensor_internal(
+static void llama_tensor_dequantize_internal(
     struct ggml_tensor * tensor, std::vector<no_init<float>> & output, std::vector<std::thread> & workers,
     const size_t nelements, const int nthread
 ) {
@@ -11177,6 +11177,46 @@ static ggml_type get_k_quant_type(quantize_state_internal & qs, ggml_type new_ty
     return new_type;
 }
 
+static int32_t llama_tensor_quantize_internal(enum ggml_type new_type, const float * f32_data, void * new_data, const int chunk_size, int nrows, int n_per_row, int64_t * hist_cur, const float * imatrix, std::vector<std::thread> & workers, const int nthread) {
+    std::mutex mutex;
+    int counter = 0;
+    size_t new_size = 0;
+    if (nthread < 2) {
+        // single-thread
+        return ggml_quantize_chunk(new_type, f32_data, new_data, 0, nrows, n_per_row, hist_cur, imatrix);
+    }
+    auto compute = [&mutex, &counter, &hist_cur, &new_size, new_type, f32_data, new_data, chunk_size,
+            nrows, n_per_row, imatrix]() {
+        std::array<int64_t, 1 << 4> local_hist = {};
+        const int nrows_per_chunk = chunk_size / n_per_row;
+        size_t local_size = 0;
+        while (true) {
+            std::unique_lock<std::mutex> lock(mutex);
+            int first_row = counter; counter += nrows_per_chunk;
+            if (first_row >= nrows) {
+                if (local_size > 0) {
+                    for (int j=0; j<int(local_hist.size()); ++j) {
+                        hist_cur[j] += local_hist[j];
+                    }
+                    new_size += local_size;
+                }
+                break;
+            }
+            lock.unlock();
+            const int this_nrow = std::min(nrows - first_row, nrows_per_chunk);
+            local_size += ggml_quantize_chunk(new_type, f32_data, new_data,
+                    first_row * n_per_row, this_nrow, n_per_row, local_hist.data(), imatrix);
+        }
+    };
+    for (int it = 0; it < nthread - 1; ++it) {
+        workers.emplace_back(compute);
+    }
+    compute();
+    for (auto & w : workers) { w.join(); }
+    workers.clear();
+    return new_size;
+}
+
 static void llama_model_quantize_internal(const std::string & fname_inp, const std::string & fname_out, const llama_model_quantize_params * params) {
     ggml_type quantized_type;
     llama_ftype ftype = params->ftype;
@@ -11289,7 +11329,6 @@ static void llama_model_quantize_internal(const std::string & fname_inp, const s
 
     std::vector<std::thread> workers;
     workers.reserve(nthread);
-    std::mutex mutex;
 
     int idx = 0;
 
@@ -11403,7 +11442,7 @@ static void llama_model_quantize_internal(const std::string & fname_inp, const s
             } else if (ggml_is_quantized(tensor->type) && !params->allow_requantize) {
                 throw std::runtime_error(format("requantizing from type %s is disabled", ggml_type_name(tensor->type)));
             } else {
-                llama_convert_tensor_internal(tensor, f32_conv_buf, workers, nelements, nthread);
+                llama_tensor_dequantize_internal(tensor, f32_conv_buf, workers, nelements, nthread);
                 f32_data = (float *) f32_conv_buf.data();
             }
 
@@ -11424,41 +11463,7 @@ static void llama_model_quantize_internal(const std::string & fname_inp, const s
 
             const int nchunk = (nelements + chunk_size - 1)/chunk_size;
             const int nthread_use = nthread > 1 ? std::max(1, std::min(nthread, nchunk)) : 1;
-            if (nthread_use < 2) {
-                new_size = ggml_quantize_chunk(new_type, f32_data, new_data, 0, nrows, n_per_row, hist_cur.data(), imatrix);
-            } else {
-                int counter = 0;
-                new_size = 0;
-                auto compute = [&mutex, &counter, &hist_cur, &new_size, new_type, f32_data, new_data, chunk_size,
-                     nrows, n_per_row, imatrix]() {
-                    std::array<int64_t, 1 << 4> local_hist = {};
-                    const int nrows_per_chunk = chunk_size / n_per_row;
-                    size_t local_size = 0;
-                    while (true) {
-                        std::unique_lock<std::mutex> lock(mutex);
-                        int first_row = counter; counter += nrows_per_chunk;
-                        if (first_row >= nrows) {
-                            if (local_size > 0) {
-                                for (int j=0; j<int(local_hist.size()); ++j) {
-                                    hist_cur[j] += local_hist[j];
-                                }
-                                new_size += local_size;
-                            }
-                            break;
-                        }
-                        lock.unlock();
-                        const int this_nrow = std::min(nrows - first_row, nrows_per_chunk);
-                        local_size += ggml_quantize_chunk(new_type, f32_data, new_data,
-                                first_row * n_per_row, this_nrow, n_per_row, local_hist.data(), imatrix);
-                    }
-                };
-                for (int it = 0; it < nthread_use - 1; ++it) {
-                    workers.emplace_back(compute);
-                }
-                compute();
-                for (auto & w : workers) { w.join(); }
-                workers.clear();
-            }
+            new_size = llama_tensor_quantize_internal(new_type, f32_data, new_data, chunk_size, nrows, n_per_row, hist_cur.data(), imatrix, workers, nthread_use);
 
             LLAMA_LOG_INFO("size = %8.2f MiB -> %8.2f MiB", ggml_nbytes(tensor)/1024.0/1024.0, new_size/1024.0/1024.0);
             int64_t tot_count = 0;