[tools/onert_train] Change default learning rate (#11745)

This commit changes the default learning rate value to 0.001.

ONE-DCO-1.0-Signed-off-by: Jiyoung Yun <[email protected]>

tests/tools/onert_train/src/args.cc

@@ -212,7 +212,7 @@ void Args::Initialize(void)
     ("mem_poll,m", po::value<bool>()->default_value(false)->notifier([&](const auto &v) { _mem_poll = v; }), "Check memory polling")
     ("epoch", po::value<int>()->default_value(5)->notifier([&](const auto &v) { _epoch = v; }), "Epoch number (default: 5)")
     ("batch_size", po::value<int>()->default_value(32)->notifier([&](const auto &v) { _batch_size = v; }), "Batch size (default: 32)")
-    ("learning_rate", po::value<float>()->default_value(1.0e-4)->notifier([&](const auto &v) { _learning_rate = v; }), "Learning rate (default: 1.0e-4)")
+    ("learning_rate", po::value<float>()->default_value(0.001)->notifier([&](const auto &v) { _learning_rate = v; }), "Learning rate (default: 0.001)")
     ("loss", po::value<int>()->default_value(0)->notifier([&] (const auto &v) { _loss_type = v; }),
         "Loss type\n"
         "0: MEAN_SQUARED_ERROR (default)\n"