Truncation issue in _get_memory

gistfile1.py

import psutil
import os
import memory_profiler

pid = os.getpid()
a = memory_profiler._get_memory(pid)

process = psutil.Process(pid)
b = float(process.get_memory_info()[0]) / (1024 ** 2)

print a
#>>>  5.0

print b
#>>>  5.66015625

print a == b
#>>> False