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included removing sparse values from dictionnary #1037

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7a37ea0
included removing sparse values from dictionnary
0xrushi Mar 6, 2019
f1945f4
modified comments for remove_sparse()
0xrushi Mar 16, 2019
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12 changes: 12 additions & 0 deletions learning.py
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Original file line number Diff line number Diff line change
Expand Up @@ -298,6 +298,18 @@ def sample(self):
self.sampler = weighted_sampler(list(self.dictionary.keys()),
list(self.dictionary.values()))
return self.sampler()

def remove_sparse(self, sparse_value):
""" Keep items with probablity greater than sparse value
and remove all others, eg. if sparse_value=0.98 items with probablity
0.02 would be removed"""
prob_to_remove = 1-sparse_value
tot = self.n_obs
for (k, v) in self.dictionary.items():
if v/tot < prob_to_remove:
del self.dictionary[k]
self.n_obs -= v


# ______________________________________________________________________________

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