add cache layer to Tagger

[bung87]

if instantiating Tagger at function level it will load dictionary every time,
if instantiating Tagger at module level it will load dictionary therefore may not actually use
refer to https://github.com/fxsjy/jieba/blob/master/jieba/__init__.py

[taishi-i]

Thanks for the advice. I interpreted adding some lines tagger = Tagger() and functions (e.g, tagging = tagger.taggging) to __init__.py. , is it correct?

[bung87]

you may add a singleton tagger instance to init.py as a shorthand method that use the default dictionary and implement a initialize method for actually make io happen and use a cache layer, when call tagger.tagging or some else methods for end developer interface,check if it is initialized,if not initialize it.

[taishi-i]

Regarding a cache layer, should I refer to methods written on lines 91 to 168 in https://github.com/fxsjy/jieba/blob/master/jieba/__init__.py and add them to the class Tagger?

[bung87]

not sure about.that ,you.may consider use https://docs.python.org/3/library/functools.html#functools.lru_cache for keep code simple