def __init__(self,labeled_per_class=10):
"""
Divides training set into labeled and unlabeled data sets. For valid and test sets,
the unlabeled and labeled X are exactly the same. SemiSupervisedMNIST() objects have
self.train, self.valid, and self.test attributes, each of which is a DataNestD
class. To index one of these sets, use regular numpy slicing, e.g. self.train[idx]
labeled_per_class: {int} default to 10, sets the number of labeled samples per digit
class in the training set. E.g. labeled_per_class=10 will
result in 100 labeled training samples and 50000 unlabeled
training samples.
"""
self.raw = loadDataset('mnist')
self.nclasses = 10
self.dim_observations = 784
data = self.raw
X = data['train']
Y = data['train_y'].astype('int32')
classes = range(self.nclasses)
XL = []; YL = [];
for c in classes:
sel = Y == c
nc = sel.sum()
Xc = X[sel]
Yc = Y[sel]
idx = np.arange(nc)
np.random.shuffle(idx)
Xc = Xc[idx[:labeled_per_class]]
Yc = Yc[idx[:labeled_per_class]]
XL.append(Xc)
YL.append(Yc)
XL = np.vstack(XL)
YL = np.hstack(YL)
ntrainU = len(Y)
ntrainL = len(YL)
nvalid = len(data['valid_y'])
ntest = len(data['test_y'])
sample_func=lambda x: (x>=np.random.uniform(low=0,high=1,size=x.shape)).astype(float)
self.train = SemiSupervisedDataTrain(
XU=X,
YU=Y,
XL=XL,
YL=YL,
sample_func=sample_func)
self.valid = SemiSupervisedDataEvaluate(
X=data['valid'],
Y=data['valid_y'],
sample_func=sample_func)
self.test = SemiSupervisedDataEvaluate(
X=data['test'],
Y=data['test_y'],
sample_func=sample_func)
self.data = NestD({
'train':self.train,
'valid':self.valid,
'test':self.test
})
def __init__(self,X,Y,n=None,sample_func=None):
self.data = NestD({'U':{'X':X,'Y':Y},
'L':{'X':X,'Y':Y}})
if n is None:
n = len(X)
self.n = n
self.sample_func = sample_func
def __init__(self,data={},n=None,*args,**kwargs):
"""
Converts data to a NestD object.
data: {dict,NestD}
n: {int}
"""
self.n = n
self.data = NestD(data)
def __init__(self,XL,YL,XU,YU=None,nL=None,nU=None,sample_func=None):
self.data = NestD({'U':{'X':XU},
'L':{'X':XL,'Y':YL}})
if YU is not None:
self.data['U']['Y']=YU
if nU is None:
nU = len(XU)
self.nU = nU
if nL is None:
nL = len(XL)
self.nL = nL
self.sample_func = sample_func
def __getitem__(self,idx):
if isinstance(idx,slice):
idx = infer_slice(idx,self.nU)
idx_U = idx
idx_L = np.random.randint(low=0,high=self.nL,size=len(idx))
U = self.data['U'].apply(lambda x:x[idx_U])
L = self.data['L'].apply(lambda x:x[idx_L])
rval = NestD({'U':U,'L':L})
if self.sample_func:
X = rval[:,['X']].apply(self.sample_func)
Y = rval[:,['Y']]
rval = X.updatepaths(*zip(*Y.walk()))
return rval