fix filename

Signed-off-by: Jinzhe Zeng <jinzhe.zeng@rutgers.edu>

Author: njzjz

source/lmp/tests/test_lammps_dpa_pt_nopbc.py

@@ -21,7 +21,7 @@
 
 pbtxt_file2 = Path(__file__).parent.parent.parent / "tests" / "infer" / "deeppot.pbtxt"
 pb_file = Path(__file__).parent.parent.parent / "tests" / "infer" / "deeppot_dpa.pth"
-pb_file2 = Path(__file__).parent / "graph2.pb"
+pb_file2 = Path(__file__).parent / "graph.pb"
 system_file = Path(__file__).parent.parent.parent / "tests"
 data_file = Path(__file__).parent / "data.lmp"
 data_file_si = Path(__file__).parent / "data.si"