How to add some functionalities to this code?

[liperrino]

Hi. Please i would like to add some features to this code that i have read on beam search. Like coverage penalty and length normalization. But i don't know where to start. Can you help please?

[MagicPF]

Import Error :.local/lib/python3.6/site-packages/torchtext/_torchtext.so: undefined symbol: _ZNK3c104Type14isSubtypeOfExtERKSt10shared_ptrIS0_EPSo