Add atc params help information.

ge/offline/main.cc

@@ -292,11 +292,14 @@ class GFlagUtils {
         "  --enable_small_channel    Set enable small channel. 0(default): disable; 1: enable\n"
         "  --enable_compress_weight  Enable compress weight. true: enable; false(default): disable\n"
         "  --compress_weight_conf    Config file to compress weight\n"
-        "  --buffer_optimize         Set buffer optimize. \"l2_optimize\" (default). Set \"off_optimize\" to close\n"
+        "  --buffer_optimize         Set buffer optimize. Support \"l2_optimize\" (default), "
+        "\"l1_optimize\", \"off_optimize\"\n"
 	"  --mdl_bank_path           Set the path of the custom repository generated after model tuning.\n"
         "\n[Operator Tuning]\n"
         "  --precision_mode        precision mode, support force_fp16(default), allow_mix_precision, "
         "allow_fp32_to_fp16, must_keep_origin_dtype.\n"
+        "  --keep_dtype            Retains the precision of certain operators in inference "
+        "scenarios by using a configuration file.\n"
         "  --auto_tune_mode        Set tune mode. E.g.: \"GA,RL\", support configure multiple, spit by ,\n"
         "  --op_bank_path          Set the path of the custom repository generated after operator tuning with Auto Tune.\n"
 	"  --op_select_implmode    Set op select implmode. Support high_precision, high_performance. "