commenting the example

Author: Slasnista

examples/da/plot_otda_semi_supervised.py

@@ -32,9 +32,6 @@
 Xs, ys = ot.datasets.get_data_classif('3gauss', n_samples_source)
 Xt, yt = ot.datasets.get_data_classif('3gauss2', n_samples_target)
 
-# Cost matrix
-M = ot.dist(Xs, Xt, metric='sqeuclidean')
-
 
 ##############################################################################
 # Transport source samples onto target samples
@@ -55,6 +52,13 @@
 # of class A onto a target sample of class B != A is set to infinite, or a
 # very large value
 
+# note that in the present case we consider that all the target samples are
+# labeled. For daily applications, some target sample might not have labels,
+# in this case the element of yt corresponding to these samples should be
+# filled with -1.
+
+# Warning: we recall that -1 cannot be used as a class label
+
 
 ##############################################################################
 # Fig 1 : plots source and target samples + matrix of pairwise distance
@@ -92,6 +96,7 @@
 # the optimal coupling in the semi-supervised DA case will exhibit " shape
 # similar" to the cost matrix, (block diagonal matrix)
 
+
 ##############################################################################
 # Fig 2 : plots optimal couplings for the different methods
 ##############################################################################