Process aborts abruptly with "Killed" message

[CompileZero]

When I try to annotate the frames from the targets.conll file:

I get a "Killed" message (Last line):

The input text file is 178MB. The predicted_targets.conll file is about 11GB. And when I check the RAM usage while the process is running, it goes upto 100% and then the process terminates with the above "Killed" message. I have about 64 GB of RAM.

Is this because the text file is too large? And do I need to make changes in the source code to resolve this?