quantize: make output filename optional, default to ggml-model-<ftype>.bin (#1301)

examples/quantize/quantize.cpp

@@ -6,23 +6,47 @@
 #include <map>
 #include <string>
 
-static const std::map<std::string, enum llama_ftype> LLAMA_FTYPE_MAP = {
-  {"q4_0", LLAMA_FTYPE_MOSTLY_Q4_0},
-  {"q4_1", LLAMA_FTYPE_MOSTLY_Q4_1},
-  {"q4_2", LLAMA_FTYPE_MOSTLY_Q4_2},
-  {"q5_0", LLAMA_FTYPE_MOSTLY_Q5_0},
-  {"q5_1", LLAMA_FTYPE_MOSTLY_Q5_1},
-  {"q8_0", LLAMA_FTYPE_MOSTLY_Q8_0},
+static const std::map<std::string, llama_ftype> LLAMA_FTYPE_MAP = {
+    {"q4_0", LLAMA_FTYPE_MOSTLY_Q4_0},
+    {"q4_1", LLAMA_FTYPE_MOSTLY_Q4_1},
+    {"q4_2", LLAMA_FTYPE_MOSTLY_Q4_2},
+    {"q5_0", LLAMA_FTYPE_MOSTLY_Q5_0},
+    {"q5_1", LLAMA_FTYPE_MOSTLY_Q5_1},
+    {"q8_0", LLAMA_FTYPE_MOSTLY_Q8_0},
 };
 
+bool try_parse_ftype(const std::string & ftype_str, llama_ftype & ftype, std::string & ftype_str_out) {
+    auto it = LLAMA_FTYPE_MAP.find(ftype_str);
+    if (it != LLAMA_FTYPE_MAP.end()) {
+        ftype = it->second;
+        ftype_str_out = it->first;
+        return true;
+    }
+    // try to parse as an integer
+    try {
+        int ftype_int = std::stoi(ftype_str);
+        for (auto it = LLAMA_FTYPE_MAP.begin(); it != LLAMA_FTYPE_MAP.end(); it++) {
+            if (it->second == ftype_int) {
+                ftype = it->second;
+                ftype_str_out = it->first;
+                return true;
+            }
+        }
+    }
+    catch (...) {
+        // stoi failed
+    }
+    return false;
+}
+
 // usage:
-//  ./quantize models/llama/ggml-model.bin models/llama/ggml-model-quant.bin type
+//  ./quantize models/llama/ggml-model.bin [models/llama/ggml-model-quant.bin] type [nthreads]
 //
 int main(int argc, char ** argv) {
     ggml_time_init();
 
-    if (argc < 4) {
-        fprintf(stderr, "usage: %s model-f32.bin model-quant.bin type [nthread]\n", argv[0]);
+    if (argc < 3) {
+        fprintf(stderr, "usage: %s model-f32.bin [model-quant.bin] type [nthreads]\n", argv[0]);
         for (auto it = LLAMA_FTYPE_MAP.begin(); it != LLAMA_FTYPE_MAP.end(); it++) {
             fprintf(stderr, "  type = \"%s\" or %d\n", it->first.c_str(), it->second);
         }
@@ -36,24 +60,62 @@ int main(int argc, char ** argv) {
         ggml_free(ctx);
     }
 
+    // parse command line arguments
     const std::string fname_inp = argv[1];
-    const std::string fname_out = argv[2];
+    std::string fname_out;
+    int nthread;
+    llama_ftype ftype;
+
+    int arg_idx = 2;
+    std::string ftype_str;
+    if (try_parse_ftype(argv[arg_idx], ftype, ftype_str)) {
+        // argv[2] is the ftype
+        std::string fpath;
+        const size_t pos = fname_inp.find_last_of('/');
+        if (pos != std::string::npos) {
+            fpath = fname_inp.substr(0, pos + 1);
+        }
+        // export as [inp path]/ggml-model-[ftype].bin
+        fname_out = fpath + "ggml-model-" + ftype_str + ".bin";
+        arg_idx++;
+    }
+    else {
+        // argv[2] is the output path
+        fname_out = argv[arg_idx];
+        arg_idx++;
 
-    enum llama_ftype ftype;
-    if (argv[3][0] == 'q') {
-        auto it = LLAMA_FTYPE_MAP.find(argv[3]);
-        if (it == LLAMA_FTYPE_MAP.end()) {
-            fprintf(stderr, "%s: unknown ftype '%s'\n", __func__, argv[3]);
+        if (argc <= arg_idx) {
+            fprintf(stderr, "%s: missing ftype\n", __func__);
+            return 1;
+        }
+        // argv[3] is the ftype
+        if (!try_parse_ftype(argv[arg_idx], ftype, ftype_str)) {
+            fprintf(stderr, "%s: invalid ftype '%s'\n", __func__, argv[3]);
+            return 1;
+        }
+        arg_idx++;
+    }
+
+    // parse nthreads
+    if (argc > arg_idx) {
+        try {
+            nthread = std::stoi(argv[arg_idx]);
+        }
+        catch (const std::exception & e) {
+            fprintf(stderr, "%s: invalid nthread '%s' (%s)\n", __func__, argv[arg_idx], e.what());
             return 1;
         }
-        ftype = it->second;
     } else {
-        ftype = (enum llama_ftype)atoi(argv[3]);
+        nthread = 0;
     }
 
     fprintf(stderr, "%s: build = %d (%s)\n", __func__, BUILD_NUMBER, BUILD_COMMIT);
 
-    int nthread = argc > 4 ? atoi(argv[4]) : 0;
+    fprintf(stderr, "%s: quantizing '%s' to '%s' as %s", __func__, fname_inp.c_str(), fname_out.c_str(), ftype_str.c_str());
+    if (nthread > 0) {
+        fprintf(stderr, " using %d threads", nthread);
+    }
+    fprintf(stderr, "\n");
 
     const int64_t t_main_start_us = ggml_time_us();