Update sample_train.csv

Author: sarthakpati

samples/sample_train.csv

@@ -1,6 +1,6 @@
 SubjectID,Channel_0,Channel_1,...,Channel_X,Label
 subject_000,/full/path/subject_0/0.nii.gz,/full/path/subject_0/1.nii.gz,...,/full/path/subject_0/X.nii.gz,/full/path/subject_0/segmentation.nii.gz
-.,.,.,.,...,.
-.,.,.,.,...,.
-.,.,.,.,...,.
+.,.,.,...,.,.
+.,.,.,...,.,.
+.,.,.,...,.,.
 subject_X,/full/path/subject_N/0.nii.gz,/full/path/subject_N/1.nii.gz,...,/full/path/subject_N/X.nii.gz,/full/path/subject_N/segmentation.nii.gz