diff --git a/examples/silicon/ref_ckpts/dptb/checkpoint/mix.ep50.pth b/examples/silicon/ref_ckpts/dptb/checkpoint/mix.ep50.pth
index 8073bdfe..f6f1a41b 100644
Binary files a/examples/silicon/ref_ckpts/dptb/checkpoint/mix.ep50.pth and b/examples/silicon/ref_ckpts/dptb/checkpoint/mix.ep50.pth differ
diff --git a/examples/silicon/ref_ckpts/dptb/checkpoint/mix.iter500.pth b/examples/silicon/ref_ckpts/dptb/checkpoint/mix.iter500.pth
index 411a15c5..fb8173de 100644
Binary files a/examples/silicon/ref_ckpts/dptb/checkpoint/mix.iter500.pth and b/examples/silicon/ref_ckpts/dptb/checkpoint/mix.iter500.pth differ
diff --git a/examples/silicon/ref_ckpts/dptb/train_config.json b/examples/silicon/ref_ckpts/dptb/train_config.json
index 6e94772f..2908272f 100644
--- a/examples/silicon/ref_ckpts/dptb/train_config.json
+++ b/examples/silicon/ref_ckpts/dptb/train_config.json
@@ -110,6 +110,7 @@
             "prefix": "kpath_spk",
             "get_eigenvalues": true,
             "type": "DefaultDataset",
+            "separator": ".",
             "get_Hamiltonian": false,
             "get_overlap": false,
             "get_DM": false