hiplab/privacykit
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privacykit
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Merge branch 'master' of hiplab/privacykit into release

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Steve L. Nyemba 2022-10-17 06:30:30 +00:00 committed by Gogs
parent a2d4243f79 c167058c23
commit 021d0c1881
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10
README.md
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@ -3,6 +3,8 @@
This framework computes re-identification risk of a dataset by extending pandas. It works like a pandas **add-on**
The framework will compute the following risk measures: marketer, prosecutor, journalist and pitman risk. References for the risk measures can be found on [http://ehelthinformation.ca] (http://www.ehealthinformation.ca/wp-content/uploads/2014/08/2009-De-identification-PA-whitepaper1.pdf) and [https://www.scb.se/contentassets](https://www.scb.se/contentassets/ff271eeeca694f47ae99b942de61df83/applying-pitmans-sampling-formula-to-microdata-disclosure-risk-assessment.pdf)
There are two modes available :
**explore:**
@ -19,7 +21,7 @@ Here the assumption is that we are clear on the sets of attributes to be used an
- Marketer risk
- Prosecutor risk
- Journalist risk
- Pitman Risk
- Pitman Risk [Video tutorial,by Dr. Weiyi Xia](https://www.loom.com/share/173e109ecac64d37a54f09b103bc6681) and [Publication by Dr. Nobuaki Hoshino](https://www.scb.se/contentassets/ff271eeeca694f47ae99b942de61df83/applying-pitmans-sampling-formula-to-microdata-disclosure-risk-assessment.pdf)
### Usage:
@ -27,19 +29,19 @@ Install this package using pip as follows :
Stable :
pip install git+https://hiplab.mc.vanderbilt.edu/git/steve/deid-risk.git
pip install git+https://dev.the-phi.com/git/healthcareio/privacykit.git@release
Latest Development (not fully tested):
pip install git+https://hiplab.mc.vanderbilt.edu/git/steve/deid-risk.git@risk
pip install git+https://dev.the-phi.com/git/healthcareio/privacykit.git@dev
The framework will depend on pandas and numpy (for now). Below is a basic sample to get started quickly.
import numpy as np
import pandas as pd
import risk
import privacykit
mydf = pd.DataFrame({"x":np.random.choice( np.random.randint(1,10),50),"y":np.random.choice( np.random.randint(1,10),50),"z":np.random.choice( np.random.randint(1,10),50),"r":np.random.choice( np.random.randint(1,10),50) })
print (mydf.risk.evaluate())

202
privacykit/risk.py
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@ -43,6 +43,10 @@ from datetime import datetime
import sys
from itertools import combinations
# class Compute:
# pass
# class Population(Compute):
# pass
@pd.api.extensions.register_dataframe_accessor("risk")
class deid :
@ -57,6 +61,16 @@ class deid :
#
values = df.apply(lambda col: col.unique().size / df.shape[0])
self._dinfo = dict(zip(df.columns.tolist(),values))
# self.sample = self._df
self.init(sample=self._df)
def init(self,**_args):
_sample = _args['sample'] if 'sample' in _args else self._df
_columns = [] if 'columns' not in _args else _args['columns']
if _columns :
self._compute = Compute(sample = _sample,columns=_columns)
else:
self._comput = Compute(sample=_sample)
self._pcompute= Population()
def explore(self,**args):
"""
@ -107,40 +121,45 @@ class deid :
for size in np.arange(2,len(columns)) :
p = list(combinations(columns,size))
p = (np.array(p)[ np.random.choice( len(p), _policy_count)].tolist())
flag = 'Policy_'+str(_index)
_index += 1
for cols in p :
flag = 'Policy_'+str(_index)
r = self.evaluate(sample=sample,cols=cols,flag = flag)
p = pd.DataFrame(1*sample.columns.isin(cols)).T
p.columns = sample.columns
o = pd.concat([o,r.join(p)])
o['attributes'] = ','.join(cols)
# o['attr'] = ','.join(r.apply())
_index += 1
#
# We rename flags to policies and adequately number them, we also have a column to summarize the attributes attr
#
# for i in np.arange(RUNS):
# if 'strict' not in args or ('strict' in args and args['strict'] is False):
# n = np.random.randint(2,k)
# else:
# n = args['field_count']
# cols = np.random.choice(columns,n,replace=False).tolist()
# params = {'sample':sample,'cols':cols}
# if pop is not None :
# params['pop'] = pop
# if pop_size > 0 :
# params['pop_size'] = pop_size
# r = self.evaluate(**params)
# #
# # let's put the policy in place
# p = pd.DataFrame(1*sample.columns.isin(cols)).T
# p.columns = sample.columns
# # o = o.append(r.join(p))
# o = pd.concat([o,r.join(p)])
o.index = np.arange(o.shape[0]).astype(np.int64)
o = o.rename(columns={'flag':'policies'})
return o
def evaluate(self, **args):
def evaluate(self,**_args):
_measure = {}
self.init(**_args)
_names = ['marketer','journalist','prosecutor'] #+ (['pitman'] if 'pop_size' in _args else [])
for label in _names :
_pointer = getattr(self,label)
_measure[label] = _pointer(**_args)
_measure['fields'] = self._compute.cache['count']['fields']
_measure['groups'] = self._compute.cache['count']['groups']
_measure['rows'] = self._compute.cache['count']['rows']
if 'attr' in _args :
_measure = dict(_args['attr'],**_measure)
return pd.DataFrame([_measure])
def _evaluate(self, **args):
"""
This function has the ability to evaluate risk associated with either a population or a sample dataset
:sample sample dataset
@ -170,7 +189,7 @@ class deid :
r = {"flag":flag}
# if sample :
handle_sample = Sample()
handle_sample = Compute()
xi = sample.groupby(cols,as_index=False).count().values
handle_sample.set('groups',xi)
@ -227,6 +246,82 @@ class deid :
r['field count'] = len(cols)
return pd.DataFrame([r])
def marketer(self,**_args):
"""
This function delegates the calls to compute marketer risk of a given dataset or sample
:sample optional sample dataset
:columns optional columns of the dataset, if non is provided and inference will be made using non-unique columns
"""
if 'pop' not in _args :
if not 'sample' in _args and not 'columns' in _args :
# _handler = self._compute
pass
else:
self.init(**_args)
# _handler = Compute(**_args)
_handler = self._compute
else:
#
# Computing population estimates for the population
self._pcompute.init(**_args)
handler = self._pcompute
return _handler.marketer()
def journalist(self,**_args):
"""
This function delegates the calls to compute journalist risk of a given dataset or sample
:sample optional sample dataset
:columns optional columns of the dataset, if non is provided and inference will be made using non-unique columns
"""
if 'pop' not in _args :
if not 'sample' in _args and not 'columns' in _args :
_handler = self._compute
else:
self.init(**_args)
# _handler = Compute(**_args)
_handler = self._compute
# return _compute.journalist()
else:
self._pcompute.init(**_args)
_handler = self._pcompute
return _handler.journalist()
def prosecutor(self,**_args):
"""
This function delegates the calls to compute prosecutor risk of a given dataset or sample
:sample optional sample dataset
:columns optional columns of the dataset, if non is provided and inference will be made using non-unique columns
"""
if 'pop' not in _args :
if not 'sample' in _args and not 'columns' in _args :
# _handler = self._compute
pass
else:
self.init(**_args)
# _handler = Compute(**_args)
_handler = self._compute
else:
self._pcompute.init(**_args)
_handler = self._pcompute
return _handler.prosecutor()
def pitman(self,**_args):
if 'population' not in _args :
pop_size = int(_args['pop_size'])
self._compute.set('pop_size',pop_size)
_handler = self._compute;
else:
self._pcompute.init(**_args)
_handler = self._pcompute
return _handler.pitman()
# xi = pd.DataFrame({"sample_group_size":sample.groupby(cols,as_index=False).count()}).reset_index()
# yi = pd.DataFrame({"population_group_size":args['pop'].groupby(cols,as_index=False).size()}).reset_index()
# merged_groups = pd.merge(xi,yi,on=cols,how='inner')
# handle_population= Population()
# handle_population.set('merged_groups',merged_groups)
class Risk :
"""
This class is an abstraction of how we chose to structure risk computation i.e in 2 sub classes:
@ -240,13 +335,31 @@ class Risk :
self.cache[id] = {}
self.cache[key] = value
class Sample(Risk):
class Compute(Risk):
"""
This class will compute risk for the sample dataset: the marketer and prosecutor risk are computed by default.
This class can optionally add pitman risk if the population size is known.
"""
def __init__(self):
Risk.__init__(self)
def __init__(self,**_args):
super().__init__()
self._sample = _args['sample'] if 'sample' in _args else pd.DataFrame()
self._columns= _args['columns'] if 'columns' in _args else None
self.cache['count'] = {'groups':0,'fields':0,'rows':0}
if not self._columns :
values = self._sample.apply(lambda col: col.unique().size / self._sample.shape[0])
self._dinfo = dict(zip(self._sample.columns.tolist(),values))
self._columns = [key for key in self._dinfo if self._dinfo[key] < 1]
#
# At this point we have all the columns that are valid candidates even if the user didn't specify them
self.cache['count']['fields'] = len(self._columns)
if self._sample.shape[0] > 0 and self._columns:
_sample = _args ['sample']
_groups = self._sample.groupby(self._columns,as_index=False).count().values
self.set('groups',_groups)
self.cache['count']['groups'] = len(_groups)
self.cache['count']['rows'] = np.sum([_g[-1] for _g in _groups])
def marketer(self):
"""
computing marketer risk for sample dataset
@ -256,8 +369,10 @@ class Sample(Risk):
groups = self.cache['groups']
# group_count = groups.size
# row_count = groups.sum()
group_count = len(groups)
row_count = np.sum([_g[-1] for _g in groups])
# group_count = len(groups)
group_count = self.cache['count']['groups']
# row_count = np.sum([_g[-1] for _g in groups])
row_count = self.cache['count']['rows']
return group_count / np.float64(row_count)
def prosecutor(self):
@ -272,40 +387,52 @@ class Sample(Risk):
def unique_ratio(self):
groups = self.cache['groups']
# row_count = groups.sum()
row_count = np.sum([_g[-1] for _g in groups])
# row_count = np.sum([_g[-1] for _g in groups])
row_count = self.cache['count']['rows']
# return groups[groups == 1].sum() / np.float64(row_count)
values = [_g[-1] for _g in groups if _g[-1] == 1]
return np.sum(values) / np.float64(row_count)
def journalist(self):
return self.unique_ratio()
def pitman(self):
"""
This function will approximate pitman de-identification risk based on pitman sampling
"""
groups = self.cache['groups']
print (self.cache['pop_size'])
si = groups[groups == 1].size
# u = groups.size
u = len(groups)
alpha = np.divide(si , np.float64(u) )
row_count = np.sum([_g[-1] for _g in groups])
# row_count = np.sum([_g[-1] for _g in groups])
row_count = self.cache['count']['rows']
# f = np.divide(groups.sum(), np.float64(self.cache['pop_size']))
f = np.divide(row_count, np.float64(self.cache['pop_size']))
return np.power(f,1-alpha)
class Population(Sample):
class Population(Compute):
"""
This class will compute risk for datasets that have population information or datasets associated with them.
This computation includes pitman risk (it requires minimal information about population)
"""
def __init__(self,**args):
Sample.__init__(self)
def __init__(self,**_args):
super().__init__(**_args)
def init(self,**_args):
xi = pd.DataFrame({"sample_group_size":self._sample.groupby(self._columns,as_index=False).count()}).reset_index()
yi = pd.DataFrame({"population_group_size":_args['population'].groupby(self._columns,as_index=False).size()}).reset_index()
merged_groups = pd.merge(xi,yi,on=self._columns,how='inner')
self.set('merged_groups',merged_groups)
def set(self,key,value):
Sample.set(self,key,value)
self.set(self,key,value)
if key == 'merged_groups' :
Sample.set(self,'pop_size',np.float64(value.population_group_size.sum()) )
Sample.set(self,'groups',value.sample_group_size)
self.set(self,'pop_size',np.float64(value.population_group_size.sum()) )
self.set(self,'groups',value.sample_group_size)
"""
This class will measure risk and account for the existance of a population
:merged_groups {sample_group_size, population_group_size} is a merged dataset with group sizes of both population and sample
@ -314,6 +441,7 @@ class Population(Sample):
"""
This function requires
"""
r = self.cache['merged_groups']
sample_row_count = r.sample_group_size.sum()
#

6
setup.py
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@ -4,11 +4,11 @@ This is a build file for the
from setuptools import setup, find_packages
setup(
name = "risk",
version = "0.8.1",
name = "privacykit",
version = "0.9.0",
author = "Healthcare/IO - The Phi Technology LLC & Health Information Privacy Lab",
author_email = "info@the-phi.com",
license = "MIT",
packages=['risk'],
packages=['privacykit'],
install_requires = ['numpy','pandas']
)