def load_mrd(dir):
print('parsing source dictionary file...')
mrd_source = MrdDataSource(os.path.join(dir,'morphs.utf8.mrd'),
os.path.join(dir,'gramtab.utf8.mrd'),
strip_EE=True)
mrd_source.load()
print('calculating rule frequencies...')
mrd_source.calculate_rule_freq()
return mrd_source
