kevlar memory error

[sph17]

While trying the kevlar tutorial workflow, at kevlar partition step some files fail with memory error, I used 64g and 64g swap memory.

[kevlar::partition] Building read graph in relaxed mode
Traceback (most recent call last):
  File "/PHShome/sph35/.conda/envs/kevlarClone/bin/kevlar", line 8, in <module>
  File "/PHShome/sph35/.conda/envs/kevlarClone/lib/python3.7/site-packages/kevlar/__main__.py", line 31, in main
  File "/PHShome/sph35/.conda/envs/kevlarClone/lib/python3.7/site-packages/kevlar/partition.py", line 68, in main
  File "/PHShome/sph35/.conda/envs/kevlarClone/lib/python3.7/site-packages/kevlar/partition.py", line 33, in partition
  File "/PHShome/sph35/.conda/envs/kevlarClone/lib/python3.7/site-packages/kevlar/readgraph.py", line 125, in populate_edges
  File "/PHShome/sph35/.conda/envs/kevlarClone/lib/python3.7/site-packages/networkx/classes/graph.py", line 920, in add_edge