def fit(self, Xs=None, ys=None, Xt=None, yt=None):
"""Build a coupling matrix from source and target sets of samples
(Xs, ys) and (Xt, yt)
Parameters
----------
Xs : array-like, shape (n_source_samples, n_features)
The training input samples.
ys : array-like, shape (n_source_samples,)
The class labels
Xt : array-like, shape (n_target_samples, n_features)
The training input samples.
yt : array-like, shape (n_target_samples,)
The class labels. If some target samples are unlabeled, fill the
yt's elements with -1.
Warning: Note that, due to this convention -1 cannot be used as a
class label
Returns
-------
self : object
Returns self.
"""
# check the necessary inputs parameters are here
if check_params(Xs=Xs, Xt=Xt):
# pairwise distance
self.cost_ = dist(Xs, Xt, metric=self.metric)
self.cost_ = cost_normalization(self.cost_, self.norm)
if (ys is not None) and (yt is not None):
if self.limit_max != np.infty:
self.limit_max = self.limit_max * np.max(self.cost_)
# assumes labeled source samples occupy the first rows
# and labeled target samples occupy the first columns
classes = [c for c in np.unique(ys) if c != -1]
for c in classes:
idx_s = np.where((ys != c) & (ys != -1))
idx_t = np.where(yt == c)
# all the coefficients corresponding to a source sample
# and a target sample :
# with different labels get a infinite
for j in idx_t[0]:
self.cost_[idx_s[0], j] = self.limit_max
# distribution estimation
self.mu_s = self.distribution_estimation(Xs)
self.mu_t = self.distribution_estimation(Xt)
# store arrays of samples
self.xs_ = Xs
self.xt_ = Xt
return self
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