[Python] How to solve the interrupt by signal 9: SIGKILL?

Below is my code:

with open(filename, 'r') as f:
vectors = {}
for line in f:
vals = line.rstrip().split(' ')
vectors[vals[0]] = vals[1:]


And it got this: Process finished with exit code 137 (interrupted by signal 9: SIGKILL). How should I optimize my code?

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