imatrix : keep intermediate imatrix results (ggerganov#5077)

Co-authored-by: Iwan Kawrakow <iwan.kawrakow@gmail.com>

examples/imatrix/imatrix.cpp

@@ -26,6 +26,7 @@ struct StatParams {
     std::string ofile = "imatrix.dat";
     int         n_output_frequency = 10;
     int         verbosity = 1;
+    int         keep_every = 0;
     bool        collect_output_weight = false;
 };
 
@@ -42,6 +43,9 @@ class IMatrixCollector {
     int                                    m_last_call = 0;
     std::vector<float>                     m_src1_data;
     std::vector<int>                       m_ids; // the expert ids from ggml_mul_mat_id
+                                                  //
+    void save_imatrix(const char * file_name) const;
+    void keep_imatrix(int ncall) const;
 };
 
 bool IMatrixCollector::collect_imatrix(struct ggml_tensor * t, bool ask, void * user_data) {
@@ -117,6 +121,9 @@ bool IMatrixCollector::collect_imatrix(struct ggml_tensor * t, bool ask, void *
                 if (m_last_call % m_params.n_output_frequency == 0) {
                     save_imatrix();
                 }
+                if (m_params.keep_every > 0 && m_last_call%m_params.keep_every == 0) {
+                    keep_imatrix(m_last_call);
+                }
             }
         }
     } else {
@@ -143,14 +150,28 @@ bool IMatrixCollector::collect_imatrix(struct ggml_tensor * t, bool ask, void *
             if (m_last_call % m_params.n_output_frequency == 0) {
                 save_imatrix();
             }
+            if (m_params.keep_every > 0 && m_last_call%m_params.keep_every == 0) {
+                keep_imatrix(m_last_call);
+            }
         }
     }
 
     return true;
 }
 
 void IMatrixCollector::save_imatrix() const {
-    const char * fname = m_params.ofile.empty() ? "imatrix.dat" : m_params.ofile.c_str();
+    save_imatrix(m_params.ofile.empty() ? "imatrix.dat" : m_params.ofile.c_str());
+}
+
+void IMatrixCollector::keep_imatrix(int ncall) const {
+    auto file_name = m_params.ofile;
+    if (file_name.empty()) file_name = "imatrix.dat";
+    file_name += ".at_";
+    file_name += std::to_string(ncall);
+    save_imatrix(file_name.c_str());
+}
+
+void IMatrixCollector::save_imatrix(const char * fname) const {
     std::ofstream out(fname, std::ios::binary);
     int n_entries = m_stats.size();
     out.write((const char*)&n_entries, sizeof(n_entries));
@@ -400,6 +421,8 @@ int main(int argc, char ** argv) {
             sparams.verbosity = std::stoi(argv[++iarg]);
         } else if (arg == "--no-ppl") {
             compute_ppl = false;
+        } else if (arg == "--keep-imatrix") {
+            sparams.keep_every = std::stoi(argv[++iarg]);
         } else {
             args.push_back(argv[iarg]);
         }