Documented CUDA reproducibility, added warning (#1346)

examples/common.cpp

@@ -100,6 +100,9 @@ bool gpt_params_parse(int argc, char ** argv, gpt_params & params) {
         arg = argv[i];
 
         if (arg == "-s" || arg == "--seed") {
+#if defined(GGML_USE_CUBLAS)
+            fprintf(stderr, "WARNING: when using cuBLAS generation results are NOT guaranteed to be reproducible.\n");
+#endif
             if (++i >= argc) {
                 invalid_param = true;
                 break;