read sentence as a tuple of word,tag pair
init estimate done + prob sum-to-one test passed + ready to train from some annotated data
sampling on observation util function done
discounted version of output prob matrix ready + init_estimate ready to incorporate discounted version of B
added test for prob-sum-to-one
discounted version for recipe data passed + successfully incorporated to init_estimate
memoization optimized(removed unnecessary caching) + parameter snapshot during the learnig phase
trellis part for viterbi algorithm done
viterbi done + DNA sequence labeling test done
util function load_HMM added
unpickling labels disappeared bug fixed, temporarily using a nasty method, __reduce__ to be studied