fix overflow when model size > 2^31

ffm-train.cpp

@@ -27,7 +27,7 @@ string train_help() {
 "-r <eta>: set learning rate (default 0.2)\n"
 "-s <nr_threads>: set number of threads (default 1)\n"
 "-p <path>: set path to the validation set\n"
-"--quiet: quiet model (no output)\n"
+"--quiet: quiet mode (no output)\n"
 "--no-norm: disable instance-wise normalization\n"
 "--auto-stop: stop at the iteration that achieves the best validation loss (must be used with -p)\n");
 }

ffm.cpp

@@ -106,8 +106,8 @@ inline ffm_float wTx(
             if(j2 >= model.n || f2 >= model.m)
                 continue;
 
-            ffm_float *w1_base = model.W + j1*align1 + f2*align0;
-            ffm_float *w2_base = model.W + j2*align1 + f1*align0;
+            ffm_float *w1_base = model.W + (ffm_long)j1*align1 + f2*align0;
+            ffm_float *w2_base = model.W + (ffm_long)j2*align1 + f1*align0;
 
             __m128 XMMv = _mm_set1_ps(v1*v2*r);
 
@@ -206,8 +206,8 @@ inline ffm_float wTx(
             if(j2 >= model.n || f2 >= model.m)
                 continue;
 
-            ffm_float *w1 = model.W + j1*align1 + f2*align0;
-            ffm_float *w2 = model.W + j2*align1 + f1*align0;
+            ffm_float *w1 = model.W + (ffm_long)j1*align1 + f2*align0;
+            ffm_float *w2 = model.W + (ffm_long)j2*align1 + f1*align0;
 
             ffm_float v = v1 * v2 * r;
 
@@ -516,7 +516,7 @@ void ffm_read_problem_to_disk(string txt_path, string bin_path) {
 
     Timer timer;
 
-    cout << "First check if the text file has already converted to binary format " << flush;
+    cout << "First check if the text file has already been converted to binary format " << flush;
     bool same_file = check_same_txt_bin(txt_path, bin_path);
     cout << "(" << fixed << setprecision(1) << timer.toc() << " seconds)" << endl;