> Can you add test to check that it raises TypeError? It's strange, I though that log_loss support string label.

The docstring of `los_loss` have the following example
```
    >>> log_loss(["spam", "ham", "ham", "spam"],  # doctest: +ELLIPSIS
    ...          [[.1, .9], [.9, .1], [.8, .2], [.35, .65]])
```
Thus this test should pass for the `log_loss`.