Replacing `,` by ` ` in `lpsa.data`. Just try to be consistent with LIBSVM format, which label and features are separated by ` ` instead of `,`. Comma can be used as label delimiter, for multi-label classification, where an example may have multiple labels. For LIBSVM, this is

~~~
1,2 1:1.0 3:4.0
~~~

For dense data, we can use

~~~
1,2 1.0 0.0 4.0
~~~